Free Online Tool

Specific Capacity Calculator

<!DOCTYPE html><html><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1"><style>html{font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;line-height:1.6;color:#1e293b;background:#fff;}body{margin:0;padding:0;background:#fff;color:#1e293b;}img{max-width:100%;height:auto;display:block;}table{max-width:100%;}</style></head><body><div id="tph-specific-capacity-calculator-v2">
  <style>
    #tph-specific-capacity-calculator-v2 {
      --primary: #079fb0;
      --primary-dark: #057f8d;
      --border: #9be8ef;
      --text: #12343b;
      --muted: #55737a;
      max-width: 980px;
      margin: 0 auto;
      padding: 22px;
      background: linear-gradient(135deg, #f7fdff, #eefafd);
      border: 1px solid var(--border);
      border-radius: 24px;
      box-shadow: 0 18px 45px rgba(7, 159, 176, 0.12);
      font-family: Arial, Helvetica, sans-serif;
      color: var(--text);
      height: auto;
      max-height: none;
      overflow: visible;
    }

#tph-specific-capacity-calculator-v2 * {
      box-sizing: border-box;
    }

#tph-specific-capacity-calculator-v2 .tph-sc-header {
      text-align: center;
      margin-bottom: 22px;
    }

#tph-specific-capacity-calculator-v2 .tph-sc-header h2 {
      margin: 0 0 8px;
      font-size: 30px;
      line-height: 1.2;
    }

#tph-specific-capacity-calculator-v2 .tph-sc-header p {
      max-width: 760px;
      margin: 0 auto;
      color: var(--muted);
      font-size: 15px;
      line-height: 1.7;
    }

#tph-specific-capacity-calculator-v2 .tph-sc-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 18px;
      align-items: stretch;
    }

#tph-specific-capacity-calculator-v2 .tph-sc-card,
    #tph-specific-capacity-calculator-v2 .tph-sc-info-card,
    #tph-specific-capacity-calculator-v2 .tph-sc-table-wrap {
      background: #ffffff;
      border: 1px solid var(--border);
      border-radius: 20px;
      padding: 20px;
      box-shadow: 0 12px 28px rgba(10, 110, 120, 0.08);
      height: auto;
      max-height: none;
      overflow: visible;
    }

#tph-specific-capacity-calculator-v2 h3 {
      margin: 0 0 15px;
      font-size: 20px;
    }

#tph-specific-capacity-calculator-v2 .tph-sc-field {
      margin-bottom: 15px;
    }

#tph-specific-capacity-calculator-v2 label {
      display: block;
      margin-bottom: 7px;
      font-weight: 700;
      font-size: 14px;
    }

#tph-specific-capacity-calculator-v2 .tph-sc-input-row {
      display: grid;
      grid-template-columns: 1fr 135px;
      gap: 10px;
    }

#tph-specific-capacity-calculator-v2 input,
    #tph-specific-capacity-calculator-v2 select {
      width: 100%;
      min-height: 46px;
      border: 1px solid var(--border);
      border-radius: 13px;
      padding: 10px 12px;
      font-size: 15px;
      color: var(--text);
      background: #fbffff;
      outline: none;
    }

#tph-specific-capacity-calculator-v2 input:focus,
    #tph-specific-capacity-calculator-v2 select:focus {
      border-color: var(--primary);
      box-shadow: 0 0 0 4px rgba(7, 159, 176, 0.12);
    }

#tph-specific-capacity-calculator-v2 .tph-sc-help {
      margin-top: 6px;
      font-size: 12px;
      color: var(--muted);
      line-height: 1.5;
    }

#tph-specific-capacity-calculator-v2 .tph-sc-btn {
      width: 100%;
      border: none;
      border-radius: 15px;
      padding: 14px 16px;
      font-size: 16px;
      font-weight: 800;
      cursor: pointer;
      color: #ffffff;
      background: linear-gradient(135deg, var(--primary), var(--primary-dark));
      box-shadow: 0 12px 22px rgba(7, 159, 176, 0.25);
    }

#tph-specific-capacity-calculator-v2 .tph-sc-secondary-btn {
      border: 1px solid var(--border);
      border-radius: 14px;
      padding: 11px 12px;
      cursor: pointer;
      font-size: 14px;
      font-weight: 800;
      color: var(--primary-dark);
      background: #f5feff;
    }

#tph-specific-capacity-calculator-v2 .tph-sc-actions {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 10px;
      margin-top: 12px;
    }

#tph-specific-capacity-calculator-v2 .tph-sc-main-result {
      background: linear-gradient(135deg, #079fb0, #05b8ca);
      color: #ffffff;
      border-radius: 20px;
      padding: 22px;
      text-align: center;
      margin-bottom: 15px;
      box-shadow: 0 14px 30px rgba(7, 159, 176, 0.22);
    }

#tph-specific-capacity-calculator-v2 .tph-sc-main-result .label {
      font-size: 13px;
      opacity: 0.9;
      margin-bottom: 6px;
      font-weight: 800;
      text-transform: uppercase;
    }

#tph-specific-capacity-calculator-v2 .tph-sc-main-result .value {
      font-size: 34px;
      line-height: 1.15;
      font-weight: 900;
      margin-bottom: 5px;
      word-break: break-word;
    }

#tph-specific-capacity-calculator-v2 .tph-sc-main-result .unit {
      font-size: 14px;
    }

#tph-specific-capacity-calculator-v2 .tph-sc-result-row {
      display: flex;
      justify-content: space-between;
      gap: 12px;
      padding: 12px 14px;
      margin-bottom: 9px;
      border-radius: 14px;
      background: #effdff;
      border: 1px solid #c8f4f8;
    }

#tph-specific-capacity-calculator-v2 .tph-sc-result-row span:first-child {
      color: var(--muted);
      font-weight: 700;
    }

#tph-specific-capacity-calculator-v2 .tph-sc-result-row span:last-child {
      text-align: right;
      font-weight: 800;
    }

#tph-specific-capacity-calculator-v2 .tph-sc-note {
      margin-top: 12px;
      padding: 12px 14px;
      border-radius: 14px;
      background: #fff8e6;
      border: 1px solid #ffe1a3;
      color: #6b4b05;
      font-size: 13px;
      line-height: 1.6;
    }

#tph-specific-capacity-calculator-v2 .tph-sc-error {
      display: none;
      margin-top: 12px;
      padding: 12px 14px;
      border-radius: 14px;
      background: #fff1f1;
      border: 1px solid #ffcaca;
      color: #9a1f1f;
      font-size: 14px;
      font-weight: 700;
    }

#tph-specific-capacity-calculator-v2 .tph-sc-table-wrap {
      margin-top: 18px;
    }

#tph-specific-capacity-calculator-v2 table {
      width: 100%;
      border-collapse: separate;
      border-spacing: 0;
      border-radius: 14px;
      border: 1px solid #c8f4f8;
      overflow: hidden;
    }

#tph-specific-capacity-calculator-v2 th,
    #tph-specific-capacity-calculator-v2 td {
      padding: 12px;
      text-align: left;
      border-bottom: 1px solid #d9f7fa;
      font-size: 14px;
    }

#tph-specific-capacity-calculator-v2 th {
      background: #dffaff;
      font-weight: 900;
    }

#tph-specific-capacity-calculator-v2 td {
      background: #fbffff;
    }

#tph-specific-capacity-calculator-v2 tr:last-child td {
      border-bottom: none;
    }

#tph-specific-capacity-calculator-v2 .tph-sc-info-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 18px;
      margin-top: 18px;
    }

#tph-specific-capacity-calculator-v2 .tph-sc-info-card p,
    #tph-specific-capacity-calculator-v2 .tph-sc-info-card li {
      color: var(--muted);
      font-size: 14px;
      line-height: 1.7;
    }

#tph-specific-capacity-calculator-v2 .tph-sc-info-card ul {
      margin: 0;
      padding-left: 18px;
    }

#tph-specific-capacity-calculator-v2 .tph-sc-formula {
      display: inline-block;
      padding: 10px 14px;
      border-radius: 14px;
      background: #effdff;
      border: 1px solid #c8f4f8;
      color: var(--primary-dark);
      font-weight: 900;
      margin: 5px 0 8px;
    }

@media (max-width: 760px) {
      #tph-specific-capacity-calculator-v2 {
        padding: 16px;
        border-radius: 18px;
      }

#tph-specific-capacity-calculator-v2 .tph-sc-header h2 {
        font-size: 24px;
      }

#tph-specific-capacity-calculator-v2 .tph-sc-grid,
      #tph-specific-capacity-calculator-v2 .tph-sc-info-grid {
        grid-template-columns: 1fr;
      }

#tph-specific-capacity-calculator-v2 .tph-sc-input-row,
      #tph-specific-capacity-calculator-v2 .tph-sc-actions {
        grid-template-columns: 1fr;
      }

#tph-specific-capacity-calculator-v2 .tph-sc-main-result .value {
        font-size: 28px;
      }

#tph-specific-capacity-calculator-v2 .tph-sc-result-row {
        flex-direction: column;
      }

#tph-specific-capacity-calculator-v2 .tph-sc-result-row span:last-child {
        text-align: left;
      }
    }
  </style>

<div class="tph-sc-header">
    <h2>Specific Capacity Calculator</h2>
    <p>Calculate the specific capacity of a well using pumping discharge and drawdown.</p>
  </div>

<div class="tph-sc-grid">
    <div class="tph-sc-card">
      <h3>Enter Well Test Data</h3>

<div class="tph-sc-field">
        <label for="tph_sc_v2_discharge">Well Discharge / Pumping Rate (Q)</label>
        <div class="tph-sc-input-row">
          <input id="tph_sc_v2_discharge" type="number" min="0" step="any" value="0.05" placeholder="Enter discharge">
          <select id="tph_sc_v2_discharge_unit">
            <option value="m3s">m³/s</option>
            <option value="ls">L/s</option>
            <option value="m3h">m³/h</option>
            <option value="lmin">L/min</option>
            <option value="gpm">US gpm</option>
          </select>
        </div>
        <div class="tph-sc-help">Q is the pumping rate or discharge from the well.</div>
      </div>

<div class="tph-sc-field">
        <label for="tph_sc_v2_drawdown">Drawdown (s)</label>
        <div class="tph-sc-input-row">
          <input id="tph_sc_v2_drawdown" type="number" min="0" step="any" value="5" placeholder="Enter drawdown">
          <select id="tph_sc_v2_drawdown_unit">
            <option value="m">m</option>
            <option value="ft">ft</option>
            <option value="cm">cm</option>
          </select>
        </div>
        <div class="tph-sc-help">Drawdown is the difference between static water level and pumping water level.</div>
      </div>

<button
        class="tph-sc-btn"
        type="button"
        onclick="
          var qInput = parseFloat(document.getElementById('tph_sc_v2_discharge').value);
          var sInput = parseFloat(document.getElementById('tph_sc_v2_drawdown').value);
          var qUnit = document.getElementById('tph_sc_v2_discharge_unit').value;
          var sUnit = document.getElementById('tph_sc_v2_drawdown_unit').value;
          var errorBox = document.getElementById('tph_sc_v2_error');

function fmt(n, d) {
            if (!isFinite(n)) return '0';
            if (Math.abs(n) !== 0 && Math.abs(n) < 0.0001) return n.toExponential(4);
            return Number(n).toLocaleString(undefined, { minimumFractionDigits: d, maximumFractionDigits: d });
          }

function setTxt(id, val) {
            var el = document.getElementById(id);
            if (el) el.textContent = val;
          }

if (errorBox) {
            errorBox.style.display = 'none';
            errorBox.textContent = '';
          }

if (!isFinite(qInput) || qInput <= 0) {
            if (errorBox) {
              errorBox.style.display = 'block';
              errorBox.textContent = 'Please enter a valid discharge value greater than zero.';
            }
            return false;
          }

if (!isFinite(sInput) || sInput <= 0) {
            if (errorBox) {
              errorBox.style.display = 'block';
              errorBox.textContent = 'Please enter a valid drawdown value greater than zero.';
            }
            return false;
          }

var qM3S = qInput;
          if (qUnit === 'ls') qM3S = qInput * 0.001;
          if (qUnit === 'm3h') qM3S = qInput / 3600;
          if (qUnit === 'lmin') qM3S = qInput / 60000;
          if (qUnit === 'gpm') qM3S = qInput * 0.003785411784 / 60;

var sM = sInput;
          if (sUnit === 'ft') sM = sInput * 0.3048;
          if (sUnit === 'cm') sM = sInput * 0.01;

var scM3SM = qM3S / sM;
          var qLPS = qM3S * 1000;
          var qGPM = qM3S / (0.003785411784 / 60);
          var sFT = sM / 0.3048;
          var scLPSM = scM3SM * 1000;
          var scM3HM = scM3SM * 3600;
          var scM3DayM = scM3SM * 86400;
          var scGPMFT = qGPM / sFT;

setTxt('tph_sc_v2_main_result', fmt(scM3SM, 4));
          setTxt('tph_sc_v2_input_q', fmt(qM3S, 4) + ' m³/s');
          setTxt('tph_sc_v2_input_s', fmt(sM, 4) + ' m');
          setTxt('tph_sc_v2_result_lsm', fmt(scLPSM, 4) + ' L/s/m');
          setTxt('tph_sc_v2_result_gpmft', fmt(scGPMFT, 4) + ' gpm/ft');

setTxt('tph_sc_v2_table_q_m3s', fmt(qM3S, 4));
          setTxt('tph_sc_v2_table_q_lps', fmt(qLPS, 4));
          setTxt('tph_sc_v2_table_q_gpm', fmt(qGPM, 4));
          setTxt('tph_sc_v2_table_s_m', fmt(sM, 4));
          setTxt('tph_sc_v2_table_s_ft', fmt(sFT, 4));
          setTxt('tph_sc_v2_table_sc_m3sm', fmt(scM3SM, 4));
          setTxt('tph_sc_v2_table_sc_m3hm', fmt(scM3HM, 4));
          setTxt('tph_sc_v2_table_sc_m3daym', fmt(scM3DayM, 4));
          return false;
        "
      >
        Calculate Specific Capacity
      </button>

<div class="tph-sc-note">
        Higher specific capacity usually means a more productive well. Actual performance also depends on aquifer type, pumping duration, well construction, and test conditions.
      </div>
    </div>

<div class="tph-sc-card">
      <h3>Result</h3>

<div class="tph-sc-main-result">
        <div class="label">Specific Capacity</div>
        <div id="tph_sc_v2_main_result" class="value">0.0100</div>
        <div class="unit">m³/s per m drawdown</div>
      </div>

<div class="tph-sc-result-row">
        <span>Input Discharge</span>
        <span id="tph_sc_v2_input_q">0.0500 m³/s</span>
      </div>

<div class="tph-sc-result-row">
        <span>Input Drawdown</span>
        <span id="tph_sc_v2_input_s">5.0000 m</span>
      </div>

<div class="tph-sc-result-row">
        <span>Specific Capacity</span>
        <span id="tph_sc_v2_result_lsm">10.0000 L/s/m</span>
      </div>

<div class="tph-sc-result-row">
        <span>US Field Unit</span>
        <span id="tph_sc_v2_result_gpmft">48.3118 gpm/ft</span>
      </div>

<div class="tph-sc-actions">
        <button
          class="tph-sc-secondary-btn"
          type="button"
          onclick="
            var text = 'Specific Capacity Calculator Resultn' +
            'Specific Capacity: ' + document.getElementById('tph_sc_v2_main_result').textContent + ' m³/s/mn' +
            'Specific Capacity: ' + document.getElementById('tph_sc_v2_result_lsm').textContent + 'n' +
            'US Field Unit: ' + document.getElementById('tph_sc_v2_result_gpmft').textContent + 'n' +
            'Discharge: ' + document.getElementById('tph_sc_v2_input_q').textContent + 'n' +
            'Drawdown: ' + document.getElementById('tph_sc_v2_input_s').textContent + 'n' +
            'Formula: SC = Q / s';

if (navigator.clipboard && navigator.clipboard.writeText) {
              navigator.clipboard.writeText(text);
              alert('Result copied successfully.');
            } else {
              var temp = document.createElement('textarea');
              temp.value = text;
              document.body.appendChild(temp);
              temp.select();
              document.execCommand('copy');
              document.body.removeChild(temp);
              alert('Result copied successfully.');
            }
          "
        >
          Copy Result
        </button>

<button
          class="tph-sc-secondary-btn"
          type="button"
          onclick="window.print();"
        >
          Print
        </button>
      </div>
    </div>
  </div>

<div class="tph-sc-table-wrap">
    <h3>Unit Conversion & Result Breakdown</h3>
    <table>
      <thead>
        <tr>
          <th>Measurement</th>
          <th>Value</th>
          <th>Unit</th>
        </tr>
      </thead>
      <tbody>
        <tr>
          <td>Discharge</td>
          <td id="tph_sc_v2_table_q_m3s">0.0500</td>
          <td>m³/s</td>
        </tr>
        <tr>
          <td>Discharge</td>
          <td id="tph_sc_v2_table_q_lps">50.0000</td>
          <td>L/s</td>
        </tr>
        <tr>
          <td>Discharge</td>
          <td id="tph_sc_v2_table_q_gpm">792.5162</td>
          <td>US gpm</td>
        </tr>
        <tr>
          <td>Drawdown</td>
          <td id="tph_sc_v2_table_s_m">5.0000</td>
          <td>m</td>
        </tr>
        <tr>
          <td>Drawdown</td>
          <td id="tph_sc_v2_table_s_ft">16.4042</td>
          <td>ft</td>
        </tr>
        <tr>
          <td>Specific Capacity</td>
          <td id="tph_sc_v2_table_sc_m3sm">0.0100</td>
          <td>m³/s/m</td>
        </tr>
        <tr>
          <td>Specific Capacity</td>
          <td id="tph_sc_v2_table_sc_m3hm">36.0000</td>
          <td>m³/h/m</td>
        </tr>
        <tr>
          <td>Specific Capacity</td>
          <td id="tph_sc_v2_table_sc_m3daym">864.0000</td>
          <td>m³/day/m</td>
        </tr>
      </tbody>
    </table>
  </div>

<div class="tph-sc-info-grid">
    <div class="tph-sc-info-card">
      <h3>Formula Used</h3>
      <p>The specific capacity of a well is calculated as:</p>
      <div class="tph-sc-formula">SC = Q / s</div>
      <p>
        Where <strong>Q</strong> is well discharge and <strong>s</strong> is drawdown.
        The result represents discharge per unit drawdown.
      </p>
    </div>

<div class="tph-sc-info-card">
      <h3>How to Use</h3>
      <ul>
        <li>Enter the well discharge or pumping rate.</li>
        <li>Select the correct discharge unit.</li>
        <li>Enter the drawdown value.</li>
        <li>Select the drawdown unit.</li>
        <li>Click Calculate to get specific capacity and converted results.</li>
      </ul>
    </div>
  </div>
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