Conversions Force and Torque (2024 Guide) | CalcDomain

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          <h1 class="text-3xl font-bold mb-4">Force &amp; Torque Converter</h1>
          <p class="text-gray-700 mb-5">
            Engineering-friendly converter for force (N, kN, kgf, lbf) and torque (N·m, N·mm, kgf·m, kgf·cm, lbf·ft, lbf·in). Switch tab, choose units, enter a value: we normalize to a base unit and convert accurately.
          </p>

          <div id="error-box" class="error-box mb-4 hidden">
            <p id="error-msg" class="text-sm">Please enter a numeric value.</p>
          </div>

          <!-- tabs -->
          <div class="mb-5 flex gap-3">
            <button id="tab-force" class="bg-blue-600 text-white px-4 py-2 rounded-md text-sm font-semibold" type="button">Force</button>
            <button id="tab-torque" class="bg-gray-100 text-gray-700 px-4 py-2 rounded-md text-sm font-semibold" type="button">Torque</button>
          </div>

          <!-- force converter -->
          <div id="force-box" class="mb-6">
            <div class="grid grid-cols-1 lg:grid-cols-3 gap-4 items-end mb-5">
              <div>
                <label for="force-value" class="block mb-1 font-semibold">Value</label>
                <input id="force-value" type="number" step="any" value="100" class="w-full border border-gray-300 rounded-md px-3 py-2" />
              </div>
              <div>
                <div class="flex items-center justify-between mb-1">
                  <label for="force-from" class="font-semibold">From unit</label>
                  <button id="force-swap" class="text-xs text-blue-600 hover:underline" type="button">Swap</button>
                </div>
                <select id="force-from" class="w-full border border-gray-300 rounded-md px-3 py-2"></select>
              </div>
              <div>
                <label for="force-to" class="block mb-1 font-semibold">To unit</label>
                <select id="force-to" class="w-full border border-gray-300 rounded-md px-3 py-2"></select>
              </div>
            </div>
            <div class="flex gap-3 items-center mb-4">
              <button id="force-convert" class="bg-blue-600 hover:bg-blue-700 text-white font-semibold py-2 px-4 rounded-md" type="button">Convert</button>
              <p id="force-last" class="text-sm text-gray-600">Converted 100 N → 10.1972 kgf</p>
            </div>
            <div class="mb-6 bg-gray-50 border border-gray-200 rounded-md p-4 flex items-center justify-between gap-4">
              <div>
                <p class="text-xs uppercase tracking-wide text-gray-500 mb-1">Force result</p>
                <p id="force-result" class="text-2xl font-bold">10.1972</p>
              </div>
              <button id="force-copy" class="bg-white border border-gray-200 rounded-md text-sm text-gray-700 hover:bg-gray-100 px-3 py-1">Copy</button>
            </div>
          </div>

          <!-- torque converter -->
          <div id="torque-box" class="mb-6 hidden">
            <div class="grid grid-cols-1 lg:grid-cols-3 gap-4 items-end mb-5">
              <div>
                <label for="torque-value" class="block mb-1 font-semibold">Value</label>
                <input id="torque-value" type="number" step="any" value="50" class="w-full border border-gray-300 rounded-md px-3 py-2" />
              </div>
              <div>
                <div class="flex items-center justify-between mb-1">
                  <label for="torque-from" class="font-semibold">From unit</label>
                  <button id="torque-swap" class="text-xs text-blue-600 hover:underline" type="button">Swap</button>
                </div>
                <select id="torque-from" class="w-full border border-gray-300 rounded-md px-3 py-2"></select>
              </div>
              <div>
                <label for="torque-to" class="block mb-1 font-semibold">To unit</label>
                <select id="torque-to" class="w-full border border-gray-300 rounded-md px-3 py-2"></select>
              </div>
            </div>
            <div class="flex gap-3 items-center mb-4">
              <button id="torque-convert" class="bg-blue-600 hover:bg-blue-700 text-white font-semibold py-2 px-4 rounded-md" type="button">Convert</button>
              <p id="torque-last" class="text-sm text-gray-600">Converted 50 N·m → 36.8781 lbf·ft</p>
            </div>
            <div class="mb-6 bg-gray-50 border border-gray-200 rounded-md p-4 flex items-center justify-between gap-4">
              <div>
                <p class="text-xs uppercase tracking-wide text-gray-500 mb-1">Torque result</p>
                <p id="torque-result" class="text-2xl font-bold">36.8781</p>
              </div>
              <button id="torque-copy" class="bg-white border border-gray-200 rounded-md text-sm text-gray-700 hover:bg-gray-100 px-3 py-1">Copy</button>
            </div>
          </div>

          <h2 class="text-xl font-semibold mb-3">Reference tables</h2>
          <div class="scroll-x mb-6">
            <table>
              <thead>
                <tr>
                  <th colspan="2">Force</th>
                </tr>
                <tr>
                  <th>Unit</th>
                  <th>To Newton (N)</th>
                </tr>
              </thead>
              <tbody>
                <tr><td>1 N</td><td>1</td></tr>
                <tr><td>1 kN</td><td>1000</td></tr>
                <tr><td>1 kgf</td><td>9.80665</td></tr>
                <tr><td>1 lbf</td><td>4.4482216152605</td></tr>
              </tbody>
            </table>
          </div>
          <div class="scroll-x mb-6">
            <table>
              <thead>
                <tr>
                  <th colspan="2">Torque</th>
                </tr>
                <tr>
                  <th>Unit</th>
                  <th>To N·m</th>
                </tr>
              </thead>
              <tbody>
                <tr><td>1 N·m</td><td>1</td></tr>
                <tr><td>1 N·mm</td><td>0.001</td></tr>
                <tr><td>1 kgf·m</td><td>9.80665</td></tr>
                <tr><td>1 kgf·cm</td><td>0.0980665</td></tr>
                <tr><td>1 lbf·ft</td><td>1.3558179483314</td></tr>
                <tr><td>1 lbf·in</td><td>0.1130</td></tr>
              </tbody>
            </table>
          </div>

          <div class="prose">
            <h2>How the converter works</h2>
            <p>We normalize to a base unit and then convert to the target unit.</p>
            <div class="formula-box">
              <p><strong>General formula (linear)</strong></p>
              <p>\( \text{target} = \text{value} \times \frac{\text{factorFrom}}{\text{factorTo}} \)</p>
              <p>For force, the base unit is Newton (N). For torque, the base unit is Newton-metre (N·m).</p>
            </div>
            <h3>Force basics</h3>
            <p>1 kgf is the force due to 1 kg mass under standard gravity: 1 kgf = 9.80665 N. This is common in older manuals.</p>
            <h3>Torque basics</h3>
            <p>Torque is force × lever arm. Converting lbf·ft to N·m is common when matching tools to engineering specs.</p>
          </div>

          <script>
            (function(){
              const errBox = document.getElementById('error-box');
              const errMsg = document.getElementById('error-msg');
              function showError(msg){ errMsg.textContent = msg; errBox.classList.remove('hidden'); }
              function clearError(){ errBox.classList.add('hidden'); }

              // Tabs
              const tabForce = document.getElementById('tab-force');
              const tabTorque = document.getElementById('tab-torque');
              const forceBox = document.getElementById('force-box');
              const torqueBox = document.getElementById('torque-box');

              tabForce.addEventListener('click', () => {
                tabForce.classList.remove('bg-gray-100','text-gray-700');
                tabForce.classList.add('bg-blue-600','text-white');
                tabTorque.classList.remove('bg-blue-600','text-white');
                tabTorque.classList.add('bg-gray-100','text-gray-700');
                forceBox.classList.remove('hidden');
                torqueBox.classList.add('hidden');
              });

              tabTorque.addEventListener('click', () => {
                tabTorque.classList.remove('bg-gray-100','text-gray-700');
                tabTorque.classList.add('bg-blue-600','text-white');
                tabForce.classList.remove('bg-blue-600','text-white');
                tabForce.classList.add('bg-gray-100','text-gray-700');
                torqueBox.classList.remove('hidden');
                forceBox.classList.add('hidden');
              });

              // FORCE
              const forceValue = document.getElementById('force-value');
              const forceFrom = document.getElementById('force-from');
              const forceTo = document.getElementById('force-to');
              const forceBtn = document.getElementById('force-convert');
              const forceResult = document.getElementById('force-result');
              const forceLast = document.getElementById('force-last');
              const forceSwap = document.getElementById('force-swap');
              const forceCopy = document.getElementById('force-copy');

              const forceUnits = {
                "N": 1,
                "kN": 1000,
                "kgf": 9.80665,
                "lbf": 4.4482216152605
              };

              function populateForce() {
                forceFrom.innerHTML = "";
                forceTo.innerHTML = "";
                Object.keys(forceUnits).forEach((u,i) => {
                  const o1 = document.createElement('option');
                  o1.value = u; o1.textContent = u;
                  forceFrom.appendChild(o1);
                  const o2 = document.createElement('option');
                  o2.value = u; o2.textContent = u;
                  forceTo.appendChild(o2);
                });
                forceFrom.value = "N";
                forceTo.value = "kgf";
              }
              populateForce();

              function convertForce() {
                clearError();
                const val = parseFloat(forceValue.value);
                if (isNaN(val)) {
                  showError("Enter a numeric force value.");
                  return;
                }
                const uFrom = forceFrom.value;
                const uTo = forceTo.value;
                const base = val * forceUnits[uFrom];
                const out = base / forceUnits[uTo];
                forceResult.textContent = out.toFixed(6);
                forceLast.textContent = `Converted ${val} ${uFrom} → ${out.toFixed(6)} ${uTo}`;
              }
              forceBtn.addEventListener('click', convertForce);
              forceSwap.addEventListener('click', () => {
                const tmp = forceFrom.value;
                forceFrom.value = forceTo.value;
                forceTo.value = tmp;
                convertForce();
              });
              forceCopy.addEventListener('click', async () => {
                try { await navigator.clipboard.writeText(forceResult.textContent); } catch(e){}
              });

              // TORQUE
              const torqueValue = document.getElementById('torque-value');
              const torqueFrom = document.getElementById('torque-from');
              const torqueTo = document.getElementById('torque-to');
              const torqueBtn = document.getElementById('torque-convert');
              const torqueResult = document.getElementById('torque-result');
              const torqueLast = document.getElementById('torque-last');
              const torqueSwap = document.getElementById('torque-swap');
              const torqueCopy = document.getElementById('torque-copy');

              const torqueUnits = {
                "N·m": 1,
                "N·mm": 0.001,
                "kgf·m": 9.80665,
                "kgf·cm": 0.0980665,
                "lbf·ft": 1.3558179483314,
                "lbf·in": 0.1130
              };

              function populateTorque() {
                torqueFrom.innerHTML = "";
                torqueTo.innerHTML = "";
                Object.keys(torqueUnits).forEach(u => {
                  const o1 = document.createElement('option');
                  o1.value = u; o1.textContent = u;
                  torqueFrom.appendChild(o1);
                  const o2 = document.createElement('option');
                  o2.value = u; o2.textContent = u;
                  torqueTo.appendChild(o2);
                });
                torqueFrom.value = "N·m";
                torqueTo.value = "lbf·ft";
              }
              populateTorque();

              function convertTorque() {
                clearError();
                const val = parseFloat(torqueValue.value);
                if (isNaN(val)) {
                  showError("Enter a numeric torque value.");
                  return;
                }
                const uFrom = torqueFrom.value;
                const uTo = torqueTo.value;
                const base = val * torqueUnits[uFrom];
                const out = base / torqueUnits[uTo];
                torqueResult.textContent = out.toFixed(6);
                torqueLast.textContent = `Converted ${val} ${uFrom} → ${out.toFixed(6)} ${uTo}`;
              }
              torqueBtn.addEventListener('click', convertTorque);
              torqueSwap.addEventListener('click', () => {
                const tmp = torqueFrom.value;
                torqueFrom.value = torqueTo.value;
                torqueTo.value = tmp;
                convertTorque();
              });
              torqueCopy.addEventListener('click', async () => {
                try { await navigator.clipboard.writeText(torqueResult.textContent); } catch(e){}
              });

              // initial
              convertForce();
              convertTorque();
            })();
          </script>
        </div>



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              <h2 class="text-xl font-semibold mb-4">Sources</h2>
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                <ul class="list-disc list-inside text-sm text-gray-700 space-y-1">
                  <li>
                    <a href="https://www.nist.gov/pml/owm/metric-si/si-units" class="text-blue-600 hover:underline" target="_blank" rel="noopener">
                      NIST: The International System of Units (SI)
                    </a>
                  </li>
                  <li>
                    <a href="https://openstax.org/details/books/college-algebra" class="text-blue-600 hover:underline" target="_blank" rel="noopener">
                      OpenStax: College Algebra
                    </a>
                  </li>
                </ul>
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<section class="bg-white p-4 rounded-lg shadow-md mt-6"><h2 class="text-lg font-semibold mb-2">Engineering notes</h2><p class="text-sm text-gray-700">Use SI units and keep dimensional consistency. Verify boundary conditions, safety factors, and design limits.</p><p class="text-sm text-gray-700 mt-2">Key entities: Conversions, Force, And, Torque, Value, From unit, To unit.</p></section><section class="bg-white p-4 rounded-lg shadow-md mt-6"><h2 class="text-lg font-semibold mb-2">Inputs used by this calculator</h2><ul class="text-sm text-gray-700 list-disc pl-5"><li>Value</li><li>From unit</li><li>To unit</li><li>Value</li><li>From unit</li><li>To unit</li></ul></section><section class="bg-white p-4 rounded-lg shadow-md mt-6"><h2 class="text-lg font-semibold mb-2">Consistency checks</h2><p class="text-sm text-gray-700">Checks: consistent units, allowed ranges, technical rounding.</p></section><section class="bg-white p-4 rounded-lg shadow-md mt-6"><h2 class="text-lg font-semibold mb-2">Engineering notes</h2><p class="text-sm text-gray-700">Use SI units and keep dimensional consistency. Verify boundary conditions, safety factors, and design limits.</p><p class="text-sm text-gray-700 mt-2">Key entities: Conversions, Force, And, Torque, Value, From unit, To unit.</p></section><section class="bg-white p-4 rounded-lg shadow-md mt-6"><h2 class="text-lg font-semibold mb-2">Inputs used by this calculator</h2><ul class="text-sm text-gray-700 list-disc pl-5"><li>Value</li><li>From unit</li><li>To unit</li><li>Value</li><li>From unit</li><li>To unit</li></ul></section><section class="bg-white p-4 rounded-lg shadow-md mt-6"><h2 class="text-lg font-semibold mb-2">Consistency checks</h2><p class="text-sm text-gray-700">Checks: consistent units, allowed ranges, technical rounding.</p></section><!-- %%EEAT_STRIP%% -->
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