{"id":24340,"date":"2026-02-13T02:01:55","date_gmt":"2026-02-13T02:01:55","guid":{"rendered":"https:\/\/www.mechstream.com\/?p=24340"},"modified":"2026-02-13T02:04:15","modified_gmt":"2026-02-13T02:04:15","slug":"sheet-metal-bend-allowance-calculator","status":"publish","type":"post","link":"https:\/\/www.mechstream.com\/ru\/sheet-metal-bend-allowance-calculator\/","title":{"rendered":"Sheet Metal Bend Allowance Calculator"},"content":{"rendered":"\n<p>The <strong>Sheet Metal Bend Allowance Calculator<\/strong> is an essential engineering tool for accurately determining the flat pattern length of bent sheet metal parts before fabrication. By calculating the material stretch that occurs during the bending process, this calculator helps engineers, designers, and fabricators achieve precise dimensional control and reduce costly trial-and-error adjustments. Whether you are working with stainless steel, aluminum, or carbon steel, the Sheet Metal Bend Allowance Calculator ensures consistent bend accuracy by factoring in material thickness, bend radius, bend angle, and K-factor. It is especially valuable for press brake operations, production planning, and CAD design validation, improving efficiency while minimizing material waste and rework.<\/p>\n\n\n\n<!-- Bend Allowance Calculator - WordPress Embeddable -->\n<style>\n    @import url('https:\/\/fonts.googleapis.com\/css2?family=Inter:wght@400;500;600;700;800&family=JetBrains+Mono:wght@400;500&display=swap');\n    \n    \/* Scoped styles - only affect elements inside .ba-calculator-wrapper *\/\n    .ba-calculator-wrapper {\n        font-family: 'Inter', sans-serif;\n        box-sizing: border-box;\n        max-width: 36rem;\n        padding: 0 1rem;\n        margin-left: auto;\n        margin-right: auto;\n    }\n    \n    .ba-calculator-wrapper *,\n    .ba-calculator-wrapper *::before,\n    .ba-calculator-wrapper *::after {\n        box-sizing: border-box;\n    }\n    \n    .ba-calculator-wrapper .ba-mono {\n        font-family: 'JetBrains Mono', monospace;\n    }\n    \n    .ba-calculator-wrapper .ba-title {\n        font-size: 1.5rem;\n        font-weight: 700;\n        color: #1f2937;\n        margin-bottom: 1.5rem;\n        margin-top: 0;\n        text-align: left;\n    }\n    \n    .ba-calculator-wrapper .ba-card {\n        background-color: #ffffff;\n        border-radius: 1rem;\n        box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);\n        padding: 1.5rem;\n        border: 1px solid #e5e7eb;\n    }\n    \n    .ba-calculator-wrapper .ba-input-group {\n        margin-bottom: 1.25rem;\n    }\n    \n    .ba-calculator-wrapper .ba-input-group:last-of-type {\n        margin-bottom: 0;\n    }\n    \n    .ba-calculator-wrapper .ba-label {\n        display: block;\n        font-size: 0.875rem;\n        font-weight: 600;\n        color: #374151;\n        margin-bottom: 0.5rem;\n    }\n    \n    .ba-calculator-wrapper .ba-label-unit {\n        color: #9ca3af;\n        font-weight: 400;\n    }\n    \n    .ba-calculator-wrapper .ba-input {\n        width: 100%;\n        padding: 0.75rem 1rem;\n        border: 2px solid #e5e7eb;\n        border-radius: 0.75rem;\n        font-size: 1.125rem;\n        font-weight: 500;\n        font-family: 'JetBrains Mono', monospace;\n        transition: all 0.2s ease;\n        background-color: #ffffff;\n        color: #1f2937;\n        outline: none;\n    }\n    \n    .ba-calculator-wrapper .ba-input:focus {\n        border-color: #3b82f6;\n        box-shadow: 0 0 0 4px rgba(59, 130, 246, 0.1);\n    }\n    \n    .ba-calculator-wrapper .ba-input::-webkit-inner-spin-button,\n    .ba-calculator-wrapper .ba-input::-webkit-outer-spin-button {\n        -webkit-appearance: none;\n        margin: 0;\n    }\n    \n    .ba-calculator-wrapper .ba-input[type=\"number\"] {\n        -moz-appearance: textfield;\n    }\n    \n    .ba-calculator-wrapper .ba-flex-row {\n        display: flex;\n        gap: 0.75rem;\n    }\n    \n    .ba-calculator-wrapper .ba-select {\n        flex: 1;\n        padding: 0.75rem 1rem;\n        border: 2px solid #e5e7eb;\n        border-radius: 0.75rem;\n        font-size: 1rem;\n        font-weight: 500;\n        background-color: #ffffff;\n        cursor: pointer;\n        transition: all 0.2s ease;\n        color: #1f2937;\n        outline: none;\n    }\n    \n    .ba-calculator-wrapper .ba-select:focus {\n        border-color: #3b82f6;\n        box-shadow: 0 0 0 4px rgba(59, 130, 246, 0.1);\n    }\n    \n    .ba-calculator-wrapper .ba-input-small {\n        width: 7rem;\n        text-align: center;\n    }\n    \n    .ba-calculator-wrapper .ba-btn-wrapper {\n        margin-top: 1.5rem;\n        display: flex;\n        justify-content: center;\n    }\n    \n    .ba-calculator-wrapper .ba-btn {\n        width: 33.333%;\n        padding: 0.75rem 1rem;\n        border-radius: 0.75rem;\n        color: #ffffff;\n        font-weight: 600;\n        font-size: 1.125rem;\n        background-color: #2156dc;\n        border: none;\n        cursor: pointer;\n        transition: all 0.2s ease;\n    }\n    \n    .ba-calculator-wrapper .ba-btn:hover {\n        opacity: 0.9;\n    }\n    \n    .ba-calculator-wrapper .ba-btn:active {\n        transform: scale(0.98);\n    }\n    \n    .ba-calculator-wrapper .ba-result-section {\n        margin-top: 1.5rem;\n        display: none;\n    }\n    \n    .ba-calculator-wrapper .ba-result-section.ba-visible {\n        display: block;\n    }\n    \n    .ba-calculator-wrapper .ba-result-box {\n        background-color: #f9fafb;\n        border-radius: 0.75rem;\n        padding: 1.25rem;\n        border: 1px solid #e5e7eb;\n        text-align: center;\n    }\n    \n    .ba-calculator-wrapper .ba-result-label {\n        color: #6b7280;\n        font-size: 0.875rem;\n        text-transform: uppercase;\n        letter-spacing: 0.05em;\n        margin-bottom: 0.5rem;\n        margin-top: 0;\n    }\n    \n    .ba-calculator-wrapper .ba-result-value-wrapper {\n        display: flex;\n        align-items: baseline;\n        justify-content: center;\n        gap: 0.5rem;\n    }\n    \n    .ba-calculator-wrapper .ba-result-value {\n        font-size: 2.25rem;\n        font-weight: 800;\n        font-family: 'JetBrains Mono', monospace;\n        color: #1f2937;\n    }\n    \n    .ba-calculator-wrapper .ba-result-unit {\n        font-size: 1.25rem;\n        font-weight: 500;\n        color: #4b5563;\n    }\n<\/style>\n\n<div class=\"ba-calculator-wrapper\">\n    <!-- Calculator Title -->\n    <h2 class=\"ba-title\">Calculator<\/h2>\n    \n    <!-- Calculator Card -->\n    <div class=\"ba-card\">\n        <!-- Input Section -->\n        <div>\n            <!-- Material Thickness -->\n            <div class=\"ba-input-group\">\n                <label class=\"ba-label\">\n                    Material Thickness (T)\n                    <span class=\"ba-label-unit\">mm<\/span>\n                <\/label>\n                <input type=\"number\" id=\"ba-thickness\" step=\"0.01\" min=\"0.1\" placeholder=\"\" class=\"ba-input ba-mono\" \/>\n            <\/div>\n\n            <!-- Inside Radius -->\n            <div class=\"ba-input-group\">\n                <label class=\"ba-label\">\n                    Inside Bend Radius (R)\n                    <span class=\"ba-label-unit\">mm<\/span>\n                <\/label>\n                <input type=\"number\" id=\"ba-radius\" step=\"0.01\" min=\"0\" placeholder=\"\" class=\"ba-input ba-mono\" \/>\n            <\/div>\n\n            <!-- Bend Angle -->\n            <div class=\"ba-input-group\">\n                <label class=\"ba-label\">\n                    Bend Angle (\u0394)\n                    <span class=\"ba-label-unit\">degrees (0-180)<\/span>\n                <\/label>\n                <input type=\"number\" id=\"ba-angle\" min=\"0\" max=\"180\" placeholder=\"\" class=\"ba-input ba-mono\" \/>\n            <\/div>\n\n            <!-- K-Factor -->\n            <div class=\"ba-input-group\">\n                <label class=\"ba-label\">\n                    K-Factor (K)\n                    <span class=\"ba-label-unit\">0.3 &#8211; 0.5 typical<\/span>\n                <\/label>\n                <div class=\"ba-flex-row\">\n                    <select id=\"ba-kFactorPreset\" class=\"ba-select\">\n                        <option value=\"\">&#8212; Common Values &#8212;<\/option>\n                        <option value=\"0.448\">Cold Rolled Steel (0.448)<\/option>\n                        <option value=\"0.35\">Aluminum (0.35)<\/option>\n                        <option value=\"0.44\">Stainless Steel (0.44)<\/option>\n                        <option value=\"0.38\">Copper (0.38)<\/option>\n                        <option value=\"0.33\">Soft Brass (0.33)<\/option>\n                        <option value=\"0.5\">Hard Materials (0.50)<\/option>\n                    <\/select>\n                    <input type=\"number\" id=\"ba-kFactor\" step=\"0.001\" min=\"0.25\" max=\"0.55\" placeholder=\"\" class=\"ba-input ba-input-small ba-mono\" \/>\n                <\/div>\n            <\/div>\n        <\/div>\n\n        <!-- Calculate Button -->\n        <div class=\"ba-btn-wrapper\">\n            <button id=\"ba-calculateBtn\" class=\"ba-btn\">Calculate<\/button>\n        <\/div>\n\n        <!-- Result Section (Hidden by default) -->\n        <div id=\"ba-resultSection\" class=\"ba-result-section\">\n            <div class=\"ba-result-box\">\n                <p class=\"ba-result-label\">Bend Allowance (BA)<\/p>\n                <div class=\"ba-result-value-wrapper\">\n                    <span class=\"ba-result-value\" id=\"ba-resultValue\">0.000<\/span>\n                    <span class=\"ba-result-unit\">mm<\/span>\n                <\/div>\n            <\/div>\n        <\/div>\n    <\/div>\n<\/div>\n\n<script>\n(function() {\n    \/\/ DOM Elements - using unique IDs with 'ba-' prefix\n    const thicknessInput = document.getElementById('ba-thickness');\n    const radiusInput = document.getElementById('ba-radius');\n    const angleInput = document.getElementById('ba-angle');\n    const kFactorInput = document.getElementById('ba-kFactor');\n    const kFactorPreset = document.getElementById('ba-kFactorPreset');\n    const calculateBtn = document.getElementById('ba-calculateBtn');\n    const resultSection = document.getElementById('ba-resultSection');\n    const resultValue = document.getElementById('ba-resultValue');\n    \n    \/\/ Calculate Bend Allowance\n    function calculateBA() {\n        const T = parseFloat(thicknessInput.value) || 0;\n        const R = parseFloat(radiusInput.value) || 0;\n        const angle = parseFloat(angleInput.value) || 0;\n        const K = parseFloat(kFactorInput.value) || 0.44;\n        \n        \/\/ BA = \u0394 \u00d7 (\u03c0\/180) \u00d7 (R + K \u00d7 T)\n        const angleRad = angle * (Math.PI \/ 180);\n        const neutralAxis = R + (K * T);\n        const BA = angleRad * neutralAxis;\n        \n        return BA;\n    }\n    \n    \/\/ Handle Calculate Button Click\n    function handleCalculate() {\n        const BA = calculateBA();\n        resultValue.textContent = BA.toFixed(3);\n        resultSection.classList.add('ba-visible');\n    }\n    \n    \/\/ Handle K-Factor preset selection\n    function handleKFactorPreset() {\n        if (kFactorPreset.value) {\n            kFactorInput.value = kFactorPreset.value;\n        }\n    }\n    \n    \/\/ Event listeners\n    kFactorPreset.addEventListener('change', handleKFactorPreset);\n    calculateBtn.addEventListener('click', handleCalculate);\n})();\n<\/script>\n\n","protected":false},"excerpt":{"rendered":"<p>The Sheet Metal Bend Allowance Calculator is an essential engineering tool for accurately determining the flat pattern length of bent sheet metal parts before fabrication&#8230;.<\/p>","protected":false},"author":2,"featured_media":24341,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"pmpro_default_level":"","_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[8413],"tags":[6281,8483,2396],"class_list":["post-24340","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-unit-and-industry-standard-conversion","tag-bend-allowance","tag-k-factor","tag-sheet-metal","pmpro-has-access"],"acf":[],"jetpack_featured_media_url":"https:\/\/www.mechstream.com\/wp-content\/uploads\/2026\/02\/Sheet-Metal-Bend-Allowance-Calculator.png","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/www.mechstream.com\/ru\/wp-json\/wp\/v2\/posts\/24340","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.mechstream.com\/ru\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.mechstream.com\/ru\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.mechstream.com\/ru\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.mechstream.com\/ru\/wp-json\/wp\/v2\/comments?post=24340"}],"version-history":[{"count":0,"href":"https:\/\/www.mechstream.com\/ru\/wp-json\/wp\/v2\/posts\/24340\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.mechstream.com\/ru\/wp-json\/wp\/v2\/media\/24341"}],"wp:attachment":[{"href":"https:\/\/www.mechstream.com\/ru\/wp-json\/wp\/v2\/media?parent=24340"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.mechstream.com\/ru\/wp-json\/wp\/v2\/categories?post=24340"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.mechstream.com\/ru\/wp-json\/wp\/v2\/tags?post=24340"}],"curies":[{"name":"WP","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}