Spur Gear Module Calculator<\/title>\n <style>\n \/* All styles scoped under .sgmc-root - safe for WordPress embed *\/\n .sgmc-root {\n --sgmc-bg-panel: #ffffff;\n --sgmc-bg-input: #ffffff;\n --sgmc-border: #d1d5db;\n --sgmc-border-focus: #3b82f6;\n --sgmc-text: #1f2937;\n --sgmc-text-muted: #6b7280;\n --sgmc-accent: #3b82f6;\n --sgmc-accent-dim: rgba(59, 130, 246, 0.1);\n --sgmc-success: #16a34a;\n --sgmc-error: #dc2626;\n --sgmc-gear-gold: #b45309;\n --sgmc-radius: 10px;\n --sgmc-shadow: 0 1px 3px rgba(0, 0, 0, 0.08);\n --sgmc-font-mono: \"Consolas\", \"SF Mono\", \"Cascadia Code\", monospace;\n --sgmc-font-sans: \"Segoe UI\", system-ui, -apple-system, sans-serif;\n\n display: block;\n box-sizing: border-box;\n max-width: 640px;\n margin: 0 auto;\n padding: 1.5rem;\n font-family: var(--sgmc-font-sans);\n font-size: 16px;\n line-height: 1.5;\n color: var(--sgmc-text);\n background: #ffffff;\n }\n\n .sgmc-root *,\n .sgmc-root *::before,\n .sgmc-root *::after {\n box-sizing: border-box;\n }\n\n .sgmc-root .sgmc-toolbar {\n margin-bottom: 1.5rem;\n }\n\n .sgmc-root .sgmc-unit-toggle {\n display: inline-flex;\n background: var(--sgmc-bg-panel);\n border: 1px solid var(--sgmc-border);\n border-radius: var(--sgmc-radius);\n overflow: hidden;\n }\n\n .sgmc-root .sgmc-unit-toggle button {\n padding: 0.5rem 1.25rem;\n border: none;\n background: transparent;\n color: var(--sgmc-text-muted);\n font-family: var(--sgmc-font-sans);\n font-size: 0.875rem;\n font-weight: 600;\n cursor: pointer;\n transition: background 0.2s, color 0.2s;\n line-height: 1.5;\n margin: 0;\n }\n\n .sgmc-root .sgmc-unit-toggle button.sgmc-active {\n background: var(--sgmc-accent);\n color: #fff;\n }\n\n .sgmc-root .sgmc-unit-toggle button:not(.sgmc-active):hover {\n background: var(--sgmc-accent-dim);\n color: var(--sgmc-text);\n }\n\n .sgmc-root .sgmc-stack {\n display: flex;\n flex-direction: column;\n gap: 1.5rem;\n }\n\n .sgmc-root .sgmc-panel {\n background: var(--sgmc-bg-panel);\n border: 1px solid var(--sgmc-border);\n border-radius: calc(var(--sgmc-radius) + 2px);\n box-shadow: var(--sgmc-shadow);\n overflow: hidden;\n margin: 0;\n }\n\n .sgmc-root .sgmc-panel-header {\n padding: 1rem 1.25rem;\n border-bottom: 1px solid var(--sgmc-border);\n display: flex;\n align-items: center;\n gap: 0.5rem;\n margin: 0;\n }\n\n .sgmc-root .sgmc-panel-header h2 {\n font-size: 1rem;\n font-weight: 600;\n text-transform: uppercase;\n letter-spacing: 0.06em;\n color: var(--sgmc-text-muted);\n margin: 0;\n padding: 0;\n line-height: 1.5;\n }\n\n .sgmc-root .sgmc-dot {\n width: 8px;\n height: 8px;\n border-radius: 50%;\n background: var(--sgmc-accent);\n flex-shrink: 0;\n }\n\n .sgmc-root .sgmc-dot.sgmc-success { background: var(--sgmc-success); }\n\n .sgmc-root .sgmc-panel-body { padding: 1.25rem; }\n\n .sgmc-root .sgmc-mode-tabs {\n display: flex;\n margin-bottom: 1.25rem;\n border: 1px solid var(--sgmc-border);\n border-radius: var(--sgmc-radius);\n overflow: hidden;\n }\n\n .sgmc-root .sgmc-mode-tab {\n flex: 1;\n padding: 0.65rem 0.75rem;\n border: none;\n background: #ffffff;\n color: var(--sgmc-text-muted);\n font-family: var(--sgmc-font-sans);\n font-size: 0.8rem;\n font-weight: 600;\n cursor: pointer;\n transition: background 0.2s, color 0.2s;\n text-align: center;\n line-height: 1.3;\n margin: 0;\n }\n\n .sgmc-root .sgmc-mode-tab + .sgmc-mode-tab {\n border-left: 1px solid var(--sgmc-border);\n }\n\n .sgmc-root .sgmc-mode-tab.sgmc-active {\n background: var(--sgmc-accent-dim);\n color: var(--sgmc-accent);\n }\n\n .sgmc-root .sgmc-mode-tab:not(.sgmc-active):hover {\n color: var(--sgmc-text);\n }\n\n .sgmc-root .sgmc-mode-desc {\n font-size: 0.82rem;\n color: var(--sgmc-text-muted);\n margin: 0 0 1.25rem;\n padding: 0.75rem;\n background: #ffffff;\n border-radius: var(--sgmc-radius);\n border: 1px solid var(--sgmc-border);\n border-left: 3px solid var(--sgmc-gear-gold);\n }\n\n .sgmc-root .sgmc-mode-desc code {\n font-family: var(--sgmc-font-mono);\n color: var(--sgmc-gear-gold);\n font-size: 0.85rem;\n background: none;\n padding: 0;\n }\n\n .sgmc-root .sgmc-field-group { margin-bottom: 1rem; }\n .sgmc-root .sgmc-field-group:last-child { margin-bottom: 0; }\n\n .sgmc-root .sgmc-field-group label {\n display: block;\n font-size: 0.82rem;\n font-weight: 600;\n color: var(--sgmc-text-muted);\n margin: 0 0 0.35rem;\n padding: 0;\n text-transform: uppercase;\n letter-spacing: 0.04em;\n line-height: 1.5;\n }\n\n .sgmc-root .sgmc-field-group label .sgmc-symbol {\n font-family: var(--sgmc-font-mono);\n color: var(--sgmc-gear-gold);\n margin-left: 0.25rem;\n }\n\n .sgmc-root .sgmc-input-wrap { position: relative; }\n\n .sgmc-root .sgmc-input-wrap input[type=\"number\"] {\n width: 100%;\n padding: 0.65rem 2.75rem 0.65rem 0.85rem;\n background: var(--sgmc-bg-input);\n border: 1px solid var(--sgmc-border);\n border-radius: var(--sgmc-radius);\n color: var(--sgmc-text);\n font-family: var(--sgmc-font-mono);\n font-size: 1rem;\n line-height: 1.5;\n height: auto;\n margin: 0;\n transition: border-color 0.2s, box-shadow 0.2s;\n -moz-appearance: textfield;\n appearance: textfield;\n }\n\n .sgmc-root .sgmc-input-wrap input[type=\"number\"]::-webkit-outer-spin-button,\n .sgmc-root .sgmc-input-wrap input[type=\"number\"]::-webkit-inner-spin-button {\n -webkit-appearance: none;\n margin: 0;\n }\n\n .sgmc-root .sgmc-input-wrap input[type=\"number\"]:focus {\n outline: none;\n border-color: var(--sgmc-border-focus);\n box-shadow: 0 0 0 3px rgba(74, 158, 255, 0.2);\n }\n\n .sgmc-root .sgmc-input-wrap input[type=\"number\"].sgmc-invalid {\n border-color: var(--sgmc-error);\n box-shadow: 0 0 0 3px rgba(239, 68, 68, 0.15);\n }\n\n .sgmc-root .sgmc-unit-tag {\n position: absolute;\n right: 0.75rem;\n top: 50%;\n transform: translateY(-50%);\n font-size: 0.75rem;\n color: var(--sgmc-text-muted);\n font-weight: 600;\n pointer-events: none;\n }\n\n .sgmc-root .sgmc-error-msg {\n display: none;\n font-size: 0.78rem;\n color: var(--sgmc-error);\n margin: 0.3rem 0 0;\n padding: 0;\n }\n\n .sgmc-root .sgmc-error-msg.sgmc-visible { display: block; }\n\n .sgmc-root .sgmc-mode-panel { display: none; }\n .sgmc-root .sgmc-mode-panel.sgmc-active { display: block; }\n\n .sgmc-root .sgmc-btn-calculate-wrap {\n display: flex;\n justify-content: center;\n margin-top: 1.25rem;\n }\n\n .sgmc-root .sgmc-btn-calculate {\n width: 50%;\n padding: 0.85rem 1.5rem;\n border: none;\n border-radius: var(--sgmc-radius);\n background: var(--sgmc-accent);\n color: #fff;\n font-family: var(--sgmc-font-sans);\n font-size: 1rem;\n font-weight: 700;\n letter-spacing: 0.04em;\n cursor: pointer;\n transition: background 0.2s, transform 0.1s;\n line-height: 1.5;\n margin: 0;\n }\n\n .sgmc-root .sgmc-btn-calculate:hover { background: #2563eb; }\n .sgmc-root .sgmc-btn-calculate:active { transform: scale(0.99); }\n\n .sgmc-root .sgmc-results-panel { display: none; }\n .sgmc-root .sgmc-results-panel.sgmc-visible { display: block; }\n\n .sgmc-root .sgmc-result-hero {\n text-align: center;\n padding: 1.5rem;\n background: #ffffff;\n border-radius: var(--sgmc-radius);\n margin-bottom: 1.25rem;\n border: 1px solid var(--sgmc-border);\n }\n\n .sgmc-root .sgmc-result-hero .sgmc-hero-label {\n font-size: 0.75rem;\n text-transform: uppercase;\n letter-spacing: 0.1em;\n color: var(--sgmc-text-muted);\n margin-bottom: 0.25rem;\n }\n\n .sgmc-root .sgmc-result-hero .sgmc-hero-value {\n font-family: var(--sgmc-font-mono);\n font-size: clamp(2rem, 6vw, 2.75rem);\n font-weight: 700;\n color: var(--sgmc-success);\n line-height: 1.1;\n margin: 0;\n }\n\n .sgmc-root .sgmc-result-hero .sgmc-hero-unit {\n font-size: 0.85rem;\n color: var(--sgmc-text-muted);\n margin-top: 0.25rem;\n }\n\n .sgmc-root .sgmc-result-section-title {\n font-size: 0.78rem;\n text-transform: uppercase;\n letter-spacing: 0.08em;\n color: var(--sgmc-text-muted);\n margin: 1.25rem 0 0.75rem;\n padding-bottom: 0.4rem;\n border-bottom: 1px solid var(--sgmc-border);\n }\n\n .sgmc-root .sgmc-result-section-title:first-of-type { margin-top: 0; }\n\n .sgmc-root .sgmc-result-grid {\n display: grid;\n grid-template-columns: 1fr 1fr;\n gap: 0.5rem;\n }\n\n @media (max-width: 480px) {\n .sgmc-root .sgmc-result-grid { grid-template-columns: 1fr; }\n }\n\n .sgmc-root .sgmc-result-item {\n display: flex;\n justify-content: space-between;\n align-items: center;\n padding: 0.55rem 0.75rem;\n background: #ffffff;\n border-radius: 6px;\n border: 1px solid var(--sgmc-border);\n margin: 0;\n }\n\n .sgmc-root .sgmc-result-item .sgmc-ri-label {\n font-size: 0.8rem;\n color: var(--sgmc-text-muted);\n }\n\n .sgmc-root .sgmc-result-item .sgmc-ri-label .sgmc-sym {\n font-family: var(--sgmc-font-mono);\n color: var(--sgmc-gear-gold);\n }\n\n .sgmc-root .sgmc-result-item .sgmc-ri-value {\n font-family: var(--sgmc-font-mono);\n font-size: 0.9rem;\n font-weight: 600;\n color: var(--sgmc-text);\n }\n <\/style>\n<\/head>\n<body>\n \n <div id=\"sgmc-root\" class=\"sgmc-root\">\n <div class=\"sgmc-toolbar\">\n <div class=\"sgmc-unit-toggle\" role=\"group\" aria-label=\"Unit selection\">\n <button type=\"button\" id=\"sgmc-btn-mm\" class=\"sgmc-active\" aria-pressed=\"true\">Millimeters (mm)<\/button>\n <button type=\"button\" id=\"sgmc-btn-in\" aria-pressed=\"false\">Inches (in)<\/button>\n <\/div>\n <\/div>\n\n <div class=\"sgmc-stack\">\n <section class=\"sgmc-panel\" aria-label=\"Input parameters\">\n <div class=\"sgmc-panel-header\">\n <span class=\"sgmc-dot\"><\/span>\n <h2>Input Parameters<\/h2>\n <\/div>\n <div class=\"sgmc-panel-body\">\n <div class=\"sgmc-mode-tabs\" role=\"tablist\">\n <button type=\"button\" class=\"sgmc-mode-tab sgmc-active\" role=\"tab\" aria-selected=\"true\" data-mode=\"A\" id=\"sgmc-tab-a\">\n Mode A<br>Geometry\n <\/button>\n <button type=\"button\" class=\"sgmc-mode-tab\" role=\"tab\" aria-selected=\"false\" data-mode=\"B\" id=\"sgmc-tab-b\">\n Mode B<br>Center Distance\n <\/button>\n <\/div>\n\n <div class=\"sgmc-mode-panel sgmc-active\" id=\"sgmc-mode-a\" role=\"tabpanel\" aria-labelledby=\"sgmc-tab-a\">\n <p class=\"sgmc-mode-desc\">\n Calculate module from pitch diameter and tooth count:<br>\n <code>m = d \/ z<\/code>\n <\/p>\n <div class=\"sgmc-field-group\">\n <label for=\"sgmc-a-d\">Pitch Diameter <span class=\"sgmc-symbol\">(d)<\/span><\/label>\n <div class=\"sgmc-input-wrap\">\n <input type=\"number\" id=\"sgmc-a-d\" step=\"any\" min=\"0\" placeholder=\"e.g. 50\" value=\"50\">\n <span class=\"sgmc-unit-tag sgmc-length-unit\">mm<\/span>\n <\/div>\n <p class=\"sgmc-error-msg\" id=\"sgmc-err-a-d\"><\/p>\n <\/div>\n <div class=\"sgmc-field-group\">\n <label for=\"sgmc-a-z\">Number of Teeth <span class=\"sgmc-symbol\">(z)<\/span><\/label>\n <div class=\"sgmc-input-wrap\">\n <input type=\"number\" id=\"sgmc-a-z\" step=\"1\" min=\"1\" placeholder=\"e.g. 20\" value=\"20\">\n <span class=\"sgmc-unit-tag\">\u2014<\/span>\n <\/div>\n <p class=\"sgmc-error-msg\" id=\"sgmc-err-a-z\"><\/p>\n <\/div>\n <\/div>\n\n <div class=\"sgmc-mode-panel\" id=\"sgmc-mode-b\" role=\"tabpanel\" aria-labelledby=\"sgmc-tab-b\">\n <p class=\"sgmc-mode-desc\">\n Calculate module from center distance and two gear tooth counts:<br>\n <code>m = 2a \/ (z\u2081 + z\u2082)<\/code>\n <\/p>\n <div class=\"sgmc-field-group\">\n <label for=\"sgmc-b-a\">Center Distance <span class=\"sgmc-symbol\">(a)<\/span><\/label>\n <div class=\"sgmc-input-wrap\">\n <input type=\"number\" id=\"sgmc-b-a\" step=\"any\" min=\"0\" placeholder=\"e.g. 75\" value=\"75\">\n <span class=\"sgmc-unit-tag sgmc-length-unit\">mm<\/span>\n <\/div>\n <p class=\"sgmc-error-msg\" id=\"sgmc-err-b-a\"><\/p>\n <\/div>\n <div class=\"sgmc-field-group\">\n <label for=\"sgmc-b-z1\">Teeth \u2014 Gear 1 <span class=\"sgmc-symbol\">(z\u2081)<\/span><\/label>\n <div class=\"sgmc-input-wrap\">\n <input type=\"number\" id=\"sgmc-b-z1\" step=\"1\" min=\"1\" placeholder=\"e.g. 20\" value=\"20\">\n <span class=\"sgmc-unit-tag\">\u2014<\/span>\n <\/div>\n <p class=\"sgmc-error-msg\" id=\"sgmc-err-b-z1\"><\/p>\n <\/div>\n <div class=\"sgmc-field-group\">\n <label for=\"sgmc-b-z2\">Teeth \u2014 Gear 2 <span class=\"sgmc-symbol\">(z\u2082)<\/span><\/label>\n <div class=\"sgmc-input-wrap\">\n <input type=\"number\" id=\"sgmc-b-z2\" step=\"1\" min=\"1\" placeholder=\"e.g. 30\" value=\"30\">\n <span class=\"sgmc-unit-tag\">\u2014<\/span>\n <\/div>\n <p class=\"sgmc-error-msg\" id=\"sgmc-err-b-z2\"><\/p>\n <\/div>\n <\/div>\n\n <div class=\"sgmc-btn-calculate-wrap\">\n <button type=\"button\" class=\"sgmc-btn-calculate\" id=\"sgmc-btn-calculate\" onclick=\"if(window.sgmcCalculate){window.sgmcCalculate();}return false;\">Calculate<\/button>\n <\/div>\n <\/div>\n <\/section>\n\n <section class=\"sgmc-panel sgmc-results-panel\" id=\"sgmc-results-panel\" aria-label=\"Calculated results\">\n <div class=\"sgmc-panel-header\">\n <span class=\"sgmc-dot sgmc-success\"><\/span>\n <h2>Calculated Results<\/h2>\n <\/div>\n <div class=\"sgmc-panel-body\">\n <div class=\"sgmc-result-hero\" id=\"sgmc-hero-module\">\n <div class=\"sgmc-hero-label\">Module<\/div>\n <div class=\"sgmc-hero-value\" id=\"sgmc-out-module\">\u2014<\/div>\n <div class=\"sgmc-hero-unit\" id=\"sgmc-module-unit-label\">mm per tooth<\/div>\n <\/div>\n <div id=\"sgmc-results-content\"><\/div>\n <\/div>\n <\/section>\n <\/div>\n <\/div>\n\n <script 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{"id":24546,"date":"2026-07-21T05:35:39","date_gmt":"2026-07-21T05:35:39","guid":{"rendered":"https:\/\/www.mechstream.com\/?p=24546"},"modified":"2026-07-21T05:57:59","modified_gmt":"2026-07-21T05:57:59","slug":"spur-gear-module-calculator","status":"publish","type":"post","link":"https:\/\/www.mechstream.com\/ru\/spur-gear-module-calculator\/","title":{"rendered":"Spur Gear Module Calculator"},"content":{"rendered":"\n

The Spur Gear Module Calculator<\/strong> is a free online engineering tool that helps mechanical engineers, gear designers, and manufacturers accurately calculate the module of spur gears for efficient power transmission. By entering parameters such as pitch diameter, number of teeth, or circular pitch, the Spur Gear Module Calculator<\/strong> quickly determines the correct gear module, ensuring proper gear meshing, smooth operation, and optimal performance. This calculator simplifies gear design, reduces calculation errors, and supports the selection of standardized gear sizes for industrial machinery, automotive systems, and precision mechanical equipment. Whether you’re designing a new gear set or verifying an existing one, this browser-based calculator delivers fast, accurate results without requiring any software installation.<\/p>\n\n\n\n\n\n\n \n \n Spur Gear Module Calculator<\/title>\n <style>\n \/* All styles scoped under .sgmc-root - safe for WordPress embed *\/\n .sgmc-root {\n --sgmc-bg-panel: #ffffff;\n --sgmc-bg-input: #ffffff;\n --sgmc-border: #d1d5db;\n --sgmc-border-focus: #3b82f6;\n --sgmc-text: #1f2937;\n --sgmc-text-muted: #6b7280;\n --sgmc-accent: #3b82f6;\n --sgmc-accent-dim: rgba(59, 130, 246, 0.1);\n --sgmc-success: #16a34a;\n --sgmc-error: #dc2626;\n --sgmc-gear-gold: #b45309;\n --sgmc-radius: 10px;\n --sgmc-shadow: 0 1px 3px rgba(0, 0, 0, 0.08);\n --sgmc-font-mono: \"Consolas\", \"SF Mono\", \"Cascadia Code\", monospace;\n --sgmc-font-sans: \"Segoe UI\", system-ui, -apple-system, sans-serif;\n\n display: block;\n box-sizing: border-box;\n max-width: 640px;\n margin: 0 auto;\n padding: 1.5rem;\n font-family: var(--sgmc-font-sans);\n font-size: 16px;\n line-height: 1.5;\n color: var(--sgmc-text);\n background: #ffffff;\n }\n\n .sgmc-root *,\n .sgmc-root *::before,\n .sgmc-root *::after {\n box-sizing: border-box;\n }\n\n .sgmc-root .sgmc-toolbar {\n margin-bottom: 1.5rem;\n }\n\n .sgmc-root .sgmc-unit-toggle {\n display: inline-flex;\n background: var(--sgmc-bg-panel);\n border: 1px solid var(--sgmc-border);\n border-radius: var(--sgmc-radius);\n overflow: hidden;\n }\n\n .sgmc-root .sgmc-unit-toggle button {\n padding: 0.5rem 1.25rem;\n border: none;\n background: transparent;\n color: var(--sgmc-text-muted);\n font-family: var(--sgmc-font-sans);\n font-size: 0.875rem;\n font-weight: 600;\n cursor: pointer;\n transition: background 0.2s, color 0.2s;\n line-height: 1.5;\n margin: 0;\n }\n\n .sgmc-root .sgmc-unit-toggle button.sgmc-active {\n background: var(--sgmc-accent);\n color: #fff;\n }\n\n .sgmc-root .sgmc-unit-toggle button:not(.sgmc-active):hover {\n background: var(--sgmc-accent-dim);\n color: var(--sgmc-text);\n }\n\n .sgmc-root .sgmc-stack {\n display: flex;\n flex-direction: column;\n gap: 1.5rem;\n }\n\n .sgmc-root .sgmc-panel {\n background: var(--sgmc-bg-panel);\n border: 1px solid var(--sgmc-border);\n border-radius: calc(var(--sgmc-radius) + 2px);\n box-shadow: var(--sgmc-shadow);\n overflow: hidden;\n margin: 0;\n }\n\n .sgmc-root .sgmc-panel-header {\n padding: 1rem 1.25rem;\n border-bottom: 1px solid var(--sgmc-border);\n display: flex;\n align-items: center;\n gap: 0.5rem;\n margin: 0;\n }\n\n .sgmc-root .sgmc-panel-header h2 {\n font-size: 1rem;\n font-weight: 600;\n text-transform: uppercase;\n letter-spacing: 0.06em;\n color: var(--sgmc-text-muted);\n margin: 0;\n padding: 0;\n line-height: 1.5;\n }\n\n .sgmc-root .sgmc-dot {\n width: 8px;\n height: 8px;\n border-radius: 50%;\n background: var(--sgmc-accent);\n flex-shrink: 0;\n }\n\n .sgmc-root .sgmc-dot.sgmc-success { background: var(--sgmc-success); }\n\n .sgmc-root .sgmc-panel-body { padding: 1.25rem; }\n\n .sgmc-root .sgmc-mode-tabs {\n display: flex;\n margin-bottom: 1.25rem;\n border: 1px solid var(--sgmc-border);\n border-radius: var(--sgmc-radius);\n overflow: hidden;\n }\n\n .sgmc-root .sgmc-mode-tab {\n flex: 1;\n padding: 0.65rem 0.75rem;\n border: none;\n background: #ffffff;\n color: var(--sgmc-text-muted);\n font-family: var(--sgmc-font-sans);\n font-size: 0.8rem;\n font-weight: 600;\n cursor: pointer;\n transition: background 0.2s, color 0.2s;\n text-align: center;\n line-height: 1.3;\n margin: 0;\n }\n\n .sgmc-root .sgmc-mode-tab + .sgmc-mode-tab {\n border-left: 1px solid var(--sgmc-border);\n }\n\n .sgmc-root .sgmc-mode-tab.sgmc-active {\n background: var(--sgmc-accent-dim);\n color: var(--sgmc-accent);\n }\n\n .sgmc-root .sgmc-mode-tab:not(.sgmc-active):hover {\n color: var(--sgmc-text);\n }\n\n .sgmc-root .sgmc-mode-desc {\n font-size: 0.82rem;\n color: var(--sgmc-text-muted);\n margin: 0 0 1.25rem;\n padding: 0.75rem;\n background: #ffffff;\n border-radius: var(--sgmc-radius);\n border: 1px solid var(--sgmc-border);\n border-left: 3px solid var(--sgmc-gear-gold);\n }\n\n .sgmc-root .sgmc-mode-desc code {\n font-family: var(--sgmc-font-mono);\n color: var(--sgmc-gear-gold);\n font-size: 0.85rem;\n background: none;\n padding: 0;\n }\n\n .sgmc-root .sgmc-field-group { margin-bottom: 1rem; }\n .sgmc-root .sgmc-field-group:last-child { margin-bottom: 0; }\n\n .sgmc-root .sgmc-field-group label {\n display: block;\n font-size: 0.82rem;\n font-weight: 600;\n color: var(--sgmc-text-muted);\n margin: 0 0 0.35rem;\n padding: 0;\n text-transform: uppercase;\n letter-spacing: 0.04em;\n line-height: 1.5;\n }\n\n .sgmc-root .sgmc-field-group label .sgmc-symbol {\n font-family: var(--sgmc-font-mono);\n color: var(--sgmc-gear-gold);\n margin-left: 0.25rem;\n }\n\n .sgmc-root .sgmc-input-wrap { position: relative; }\n\n .sgmc-root .sgmc-input-wrap input[type=\"number\"] {\n width: 100%;\n padding: 0.65rem 2.75rem 0.65rem 0.85rem;\n background: var(--sgmc-bg-input);\n border: 1px solid var(--sgmc-border);\n border-radius: var(--sgmc-radius);\n color: var(--sgmc-text);\n font-family: var(--sgmc-font-mono);\n font-size: 1rem;\n line-height: 1.5;\n height: auto;\n margin: 0;\n transition: border-color 0.2s, box-shadow 0.2s;\n -moz-appearance: textfield;\n appearance: textfield;\n }\n\n .sgmc-root .sgmc-input-wrap input[type=\"number\"]::-webkit-outer-spin-button,\n .sgmc-root .sgmc-input-wrap input[type=\"number\"]::-webkit-inner-spin-button {\n -webkit-appearance: none;\n margin: 0;\n }\n\n .sgmc-root .sgmc-input-wrap input[type=\"number\"]:focus {\n outline: none;\n border-color: var(--sgmc-border-focus);\n box-shadow: 0 0 0 3px rgba(74, 158, 255, 0.2);\n }\n\n .sgmc-root .sgmc-input-wrap input[type=\"number\"].sgmc-invalid {\n border-color: var(--sgmc-error);\n box-shadow: 0 0 0 3px rgba(239, 68, 68, 0.15);\n }\n\n .sgmc-root .sgmc-unit-tag {\n position: absolute;\n right: 0.75rem;\n top: 50%;\n transform: translateY(-50%);\n font-size: 0.75rem;\n color: var(--sgmc-text-muted);\n font-weight: 600;\n pointer-events: none;\n }\n\n .sgmc-root .sgmc-error-msg {\n display: none;\n font-size: 0.78rem;\n color: var(--sgmc-error);\n margin: 0.3rem 0 0;\n padding: 0;\n }\n\n .sgmc-root .sgmc-error-msg.sgmc-visible { display: block; }\n\n .sgmc-root .sgmc-mode-panel { display: none; }\n .sgmc-root .sgmc-mode-panel.sgmc-active { display: block; }\n\n .sgmc-root .sgmc-btn-calculate-wrap {\n display: flex;\n justify-content: center;\n margin-top: 1.25rem;\n }\n\n .sgmc-root .sgmc-btn-calculate {\n width: 50%;\n padding: 0.85rem 1.5rem;\n border: none;\n border-radius: var(--sgmc-radius);\n background: var(--sgmc-accent);\n color: #fff;\n font-family: var(--sgmc-font-sans);\n font-size: 1rem;\n font-weight: 700;\n letter-spacing: 0.04em;\n cursor: pointer;\n transition: background 0.2s, transform 0.1s;\n line-height: 1.5;\n margin: 0;\n }\n\n .sgmc-root .sgmc-btn-calculate:hover { background: #2563eb; }\n .sgmc-root .sgmc-btn-calculate:active { transform: scale(0.99); }\n\n .sgmc-root .sgmc-results-panel { display: none; }\n .sgmc-root .sgmc-results-panel.sgmc-visible { display: block; }\n\n .sgmc-root .sgmc-result-hero {\n text-align: center;\n padding: 1.5rem;\n background: #ffffff;\n border-radius: var(--sgmc-radius);\n margin-bottom: 1.25rem;\n border: 1px solid var(--sgmc-border);\n }\n\n .sgmc-root .sgmc-result-hero .sgmc-hero-label {\n font-size: 0.75rem;\n text-transform: uppercase;\n letter-spacing: 0.1em;\n color: var(--sgmc-text-muted);\n margin-bottom: 0.25rem;\n }\n\n .sgmc-root .sgmc-result-hero .sgmc-hero-value {\n font-family: var(--sgmc-font-mono);\n font-size: clamp(2rem, 6vw, 2.75rem);\n font-weight: 700;\n color: var(--sgmc-success);\n line-height: 1.1;\n margin: 0;\n }\n\n .sgmc-root .sgmc-result-hero .sgmc-hero-unit {\n font-size: 0.85rem;\n color: var(--sgmc-text-muted);\n margin-top: 0.25rem;\n }\n\n .sgmc-root .sgmc-result-section-title {\n font-size: 0.78rem;\n text-transform: uppercase;\n letter-spacing: 0.08em;\n color: var(--sgmc-text-muted);\n margin: 1.25rem 0 0.75rem;\n padding-bottom: 0.4rem;\n border-bottom: 1px solid var(--sgmc-border);\n }\n\n .sgmc-root .sgmc-result-section-title:first-of-type { margin-top: 0; }\n\n .sgmc-root .sgmc-result-grid {\n display: grid;\n grid-template-columns: 1fr 1fr;\n gap: 0.5rem;\n }\n\n @media (max-width: 480px) {\n .sgmc-root .sgmc-result-grid { grid-template-columns: 1fr; }\n }\n\n .sgmc-root .sgmc-result-item {\n display: flex;\n justify-content: space-between;\n align-items: center;\n padding: 0.55rem 0.75rem;\n background: #ffffff;\n border-radius: 6px;\n border: 1px solid var(--sgmc-border);\n margin: 0;\n }\n\n .sgmc-root .sgmc-result-item .sgmc-ri-label {\n font-size: 0.8rem;\n color: var(--sgmc-text-muted);\n }\n\n .sgmc-root .sgmc-result-item .sgmc-ri-label .sgmc-sym {\n font-family: var(--sgmc-font-mono);\n color: var(--sgmc-gear-gold);\n }\n\n .sgmc-root .sgmc-result-item .sgmc-ri-value {\n font-family: var(--sgmc-font-mono);\n font-size: 0.9rem;\n font-weight: 600;\n color: var(--sgmc-text);\n }\n <\/style>\n<\/head>\n<body>\n \n <div id=\"sgmc-root\" class=\"sgmc-root\">\n <div class=\"sgmc-toolbar\">\n <div class=\"sgmc-unit-toggle\" role=\"group\" aria-label=\"Unit selection\">\n <button type=\"button\" id=\"sgmc-btn-mm\" class=\"sgmc-active\" aria-pressed=\"true\">Millimeters (mm)<\/button>\n <button type=\"button\" id=\"sgmc-btn-in\" aria-pressed=\"false\">Inches (in)<\/button>\n <\/div>\n <\/div>\n\n <div class=\"sgmc-stack\">\n <section class=\"sgmc-panel\" aria-label=\"Input parameters\">\n <div class=\"sgmc-panel-header\">\n <span class=\"sgmc-dot\"><\/span>\n <h2>Input Parameters<\/h2>\n <\/div>\n <div class=\"sgmc-panel-body\">\n <div class=\"sgmc-mode-tabs\" role=\"tablist\">\n <button type=\"button\" class=\"sgmc-mode-tab sgmc-active\" role=\"tab\" aria-selected=\"true\" data-mode=\"A\" id=\"sgmc-tab-a\">\n Mode A<br>Geometry\n <\/button>\n <button type=\"button\" class=\"sgmc-mode-tab\" role=\"tab\" aria-selected=\"false\" data-mode=\"B\" id=\"sgmc-tab-b\">\n Mode B<br>Center Distance\n <\/button>\n <\/div>\n\n <div class=\"sgmc-mode-panel sgmc-active\" id=\"sgmc-mode-a\" role=\"tabpanel\" aria-labelledby=\"sgmc-tab-a\">\n <p class=\"sgmc-mode-desc\">\n Calculate module from pitch diameter and tooth count:<br>\n <code>m = d \/ z<\/code>\n <\/p>\n <div class=\"sgmc-field-group\">\n <label for=\"sgmc-a-d\">Pitch Diameter <span class=\"sgmc-symbol\">(d)<\/span><\/label>\n <div class=\"sgmc-input-wrap\">\n <input type=\"number\" id=\"sgmc-a-d\" step=\"any\" min=\"0\" placeholder=\"e.g. 50\" value=\"50\">\n <span class=\"sgmc-unit-tag sgmc-length-unit\">mm<\/span>\n <\/div>\n <p class=\"sgmc-error-msg\" id=\"sgmc-err-a-d\"><\/p>\n <\/div>\n <div class=\"sgmc-field-group\">\n <label for=\"sgmc-a-z\">Number of Teeth <span class=\"sgmc-symbol\">(z)<\/span><\/label>\n <div class=\"sgmc-input-wrap\">\n <input type=\"number\" id=\"sgmc-a-z\" step=\"1\" min=\"1\" placeholder=\"e.g. 20\" value=\"20\">\n <span class=\"sgmc-unit-tag\">\u2014<\/span>\n <\/div>\n <p class=\"sgmc-error-msg\" id=\"sgmc-err-a-z\"><\/p>\n <\/div>\n <\/div>\n\n <div class=\"sgmc-mode-panel\" id=\"sgmc-mode-b\" role=\"tabpanel\" aria-labelledby=\"sgmc-tab-b\">\n <p class=\"sgmc-mode-desc\">\n Calculate module from center distance and two gear tooth counts:<br>\n <code>m = 2a \/ (z\u2081 + z\u2082)<\/code>\n <\/p>\n <div class=\"sgmc-field-group\">\n <label for=\"sgmc-b-a\">Center Distance <span class=\"sgmc-symbol\">(a)<\/span><\/label>\n <div class=\"sgmc-input-wrap\">\n <input type=\"number\" id=\"sgmc-b-a\" step=\"any\" min=\"0\" placeholder=\"e.g. 75\" value=\"75\">\n <span class=\"sgmc-unit-tag sgmc-length-unit\">mm<\/span>\n <\/div>\n <p class=\"sgmc-error-msg\" id=\"sgmc-err-b-a\"><\/p>\n <\/div>\n <div class=\"sgmc-field-group\">\n <label for=\"sgmc-b-z1\">Teeth \u2014 Gear 1 <span class=\"sgmc-symbol\">(z\u2081)<\/span><\/label>\n <div class=\"sgmc-input-wrap\">\n <input type=\"number\" id=\"sgmc-b-z1\" step=\"1\" min=\"1\" placeholder=\"e.g. 20\" value=\"20\">\n <span class=\"sgmc-unit-tag\">\u2014<\/span>\n <\/div>\n <p class=\"sgmc-error-msg\" id=\"sgmc-err-b-z1\"><\/p>\n <\/div>\n <div class=\"sgmc-field-group\">\n <label for=\"sgmc-b-z2\">Teeth \u2014 Gear 2 <span class=\"sgmc-symbol\">(z\u2082)<\/span><\/label>\n <div class=\"sgmc-input-wrap\">\n <input type=\"number\" id=\"sgmc-b-z2\" step=\"1\" min=\"1\" placeholder=\"e.g. 30\" value=\"30\">\n <span class=\"sgmc-unit-tag\">\u2014<\/span>\n <\/div>\n <p class=\"sgmc-error-msg\" id=\"sgmc-err-b-z2\"><\/p>\n <\/div>\n <\/div>\n\n <div class=\"sgmc-btn-calculate-wrap\">\n <button type=\"button\" class=\"sgmc-btn-calculate\" id=\"sgmc-btn-calculate\" onclick=\"if(window.sgmcCalculate){window.sgmcCalculate();}return false;\">Calculate<\/button>\n <\/div>\n <\/div>\n <\/section>\n\n <section class=\"sgmc-panel sgmc-results-panel\" id=\"sgmc-results-panel\" aria-label=\"Calculated results\">\n <div class=\"sgmc-panel-header\">\n <span class=\"sgmc-dot sgmc-success\"><\/span>\n <h2>Calculated Results<\/h2>\n <\/div>\n <div class=\"sgmc-panel-body\">\n <div class=\"sgmc-result-hero\" id=\"sgmc-hero-module\">\n <div class=\"sgmc-hero-label\">Module<\/div>\n <div class=\"sgmc-hero-value\" id=\"sgmc-out-module\">\u2014<\/div>\n <div class=\"sgmc-hero-unit\" id=\"sgmc-module-unit-label\">mm per tooth<\/div>\n <\/div>\n <div id=\"sgmc-results-content\"><\/div>\n <\/div>\n <\/section>\n <\/div>\n <\/div>\n\n <script 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