Conversions Fuel Economy (2024 Guide) | CalcDomain

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    <li><span class="text-gray-800">Fuel Economy Converter (MPG, L/100km, km/L, mi/L)</span></li>
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            <header class="mb-6">
              <h1 class="text-2xl font-bold mb-2">
                Fuel Economy Converter (MPG, L/100km, km/L, mi/L)
              </h1>
              <p class="text-gray-700">
                Convert fuel economy between MPG (US &amp; UK), L/100km, km/L,
                and mi/L. Enter a value in any unit and see all others update
                instantly.
              </p>
            </header>

            <section aria-labelledby="converter-heading" class="mb-8">
              <h2 id="converter-heading" class="text-xl font-semibold mb-4">
                Fuel economy conversions
              </h2>

              <div class="grid md:grid-cols-2 gap-4 mb-4">
                <div>
                  <label
                    for="fe-mpg-us"
                    class="block text-sm font-medium text-gray-700 mb-1"
                  >
                    Miles per gallon (US)
                    <span class="ml-1 text-xs text-gray-500">(mpg US)</span>
                  </label>
                  <input
                    id="fe-mpg-us"
                    type="number"
                    step="0.0001"
                    inputmode="decimal"
                    class="w-full border border-gray-300 rounded-md px-3 py-2 focus:ring-2 focus:ring-blue-500 focus:border-transparent"
                    placeholder="e.g. 30"
                  />
                </div>

                <div>
                  <label
                    for="fe-mpg-uk"
                    class="block text-sm font-medium text-gray-700 mb-1"
                  >
                    Miles per gallon (UK / Imperial)
                    <span class="ml-1 text-xs text-gray-500">(mpg UK)</span>
                  </label>
                  <input
                    id="fe-mpg-uk"
                    type="number"
                    step="0.0001"
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                    placeholder="e.g. 40"
                  />
                </div>

                <div>
                  <label
                    for="fe-l-per-100km"
                    class="block text-sm font-medium text-gray-700 mb-1"
                  >
                    Liters per 100 kilometers
                    <span class="ml-1 text-xs text-gray-500">(L/100km)</span>
                  </label>
                  <input
                    id="fe-l-per-100km"
                    type="number"
                    step="0.0001"
                    inputmode="decimal"
                    class="w-full border border-gray-300 rounded-md px-3 py-2 focus:ring-2 focus:ring-blue-500 focus:border-transparent"
                    placeholder="e.g. 7.5"
                  />
                </div>

                <div>
                  <label
                    for="fe-km-per-l"
                    class="block text-sm font-medium text-gray-700 mb-1"
                  >
                    Kilometers per liter
                    <span class="ml-1 text-xs text-gray-500">(km/L)</span>
                  </label>
                  <input
                    id="fe-km-per-l"
                    type="number"
                    step="0.0001"
                    inputmode="decimal"
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                    placeholder="e.g. 15"
                  />
                </div>

                <div>
                  <label
                    for="fe-mi-per-l"
                    class="block text-sm font-medium text-gray-700 mb-1"
                  >
                    Miles per liter
                    <span class="ml-1 text-xs text-gray-500">(mi/L)</span>
                  </label>
                  <input
                    id="fe-mi-per-l"
                    type="number"
                    step="0.0001"
                    inputmode="decimal"
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                    placeholder="e.g. 25"
                  />
                </div>
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                    <option value="1">1</option>
                    <option value="2" selected>2</option>
                    <option value="3">3</option>
                    <option value="4">4</option>
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                  Clear all
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            <section aria-labelledby="quick-comparison-heading" class="mb-8">
              <h2
                id="quick-comparison-heading"
                class="text-xl font-semibold mb-3"
              >
                Quick comparison table
              </h2>
              <p class="text-sm text-gray-700 mb-2">
                See how common fuel economy values compare across units.
              </p>
              <div class="overflow-x-auto border border-gray-200 rounded-md">
                <table class="min-w-full text-sm">
                  <thead class="bg-gray-100">
                    <tr>
                      <th
                        class="px-3 py-2 text-left font-semibold text-gray-700"
                      >
                        L/100km
                      </th>
                      <th
                        class="px-3 py-2 text-left font-semibold text-gray-700"
                      >
                        MPG (US)
                      </th>
                      <th
                        class="px-3 py-2 text-left font-semibold text-gray-700"
                      >
                        MPG (UK)
                      </th>
                      <th
                        class="px-3 py-2 text-left font-semibold text-gray-700"
                      >
                        km/L
                      </th>
                    </tr>
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                  >
                    <!-- Filled by JS -->
                  </tbody>
                </table>
              </div>
            </section>

            <section class="prose">
              <h2>How this fuel economy converter works</h2>
              <p>
                This tool converts between the most common fuel economy and fuel
                consumption units used worldwide:
              </p>
              <ul>
                <li>
                  <strong>MPG (US)</strong> – miles per US gallon (3.785&nbsp;L)
                </li>
                <li>
                  <strong>MPG (UK)</strong> – miles per Imperial gallon
                  (4.546&nbsp;L)
                </li>
                <li><strong>L/100km</strong> – liters per 100 kilometers</li>
                <li><strong>km/L</strong> – kilometers per liter</li>
                <li><strong>mi/L</strong> – miles per liter</li>
              </ul>
              <p>
                Enter a value in <em>any</em> field and the calculator will
                instantly update all the others using precise conversion
                factors. You can also adjust the number of decimal places to
                match your needs.
              </p>

              <h2>Conversion formulas</h2>
              <p>
                Internally, the converter uses exact relationships between
                distance and volume units.
              </p>

              <div class="formula-box text-sm">
                <p class="font-semibold mb-1">Base constants</p>
                <ul class="list-disc pl-5">
                  <li>1 mile = 1.609344 km</li>
                  <li>1 US gallon = 3.785411784 L</li>
                  <li>1 UK (Imperial) gallon = 4.54609 L</li>
                </ul>
              </div>

              <h3>From L/100km to MPG and km/L</h3>
              <p>
                L/100km is a <em>consumption</em> unit (fuel per distance). MPG
                and km/L are <em>economy</em> units (distance per fuel). That’s
                why the formulas use a reciprocal.
              </p>

              <div class="formula-box text-sm">
                <p>Let \( C \) be fuel consumption in L/100km.</p>
                <p class="mt-2">
                  US MPG: \[ \text{MPG}_{US} = \frac{235.214583}{C} \]
                </p>
                <p>UK MPG: \[ \text{MPG}_{UK} = \frac{282.480936}{C} \]</p>
                <p>km/L: \[ \text{km/L} = \frac{100}{C} \]</p>
                <p>mi/L: \[ \text{mi/L} = \frac{62.137119}{C} \]</p>
              </div>

              <h3>From MPG to L/100km</h3>
              <div class="formula-box text-sm">
                <p>Let \( E_{US} \) be US MPG and \( E_{UK} \) be UK MPG.</p>
                <p class="mt-2">
                  From US MPG: \[ C = \frac{235.214583}{E_{US}} \]
                </p>
                <p>From UK MPG: \[ C = \frac{282.480936}{E_{UK}} \]</p>
              </div>

              <h3>From km/L and mi/L</h3>
              <div class="formula-box text-sm">
                <p>Let \( K \) be km/L and \( M \) be mi/L.</p>
                <p class="mt-2">L/100km from km/L: \[ C = \frac{100}{K} \]</p>
                <p>L/100km from mi/L: \[ C = \frac{62.137119}{M} \]</p>
                <p>
                  US MPG from km/L: \[ \text{MPG}_{US} = K \cdot
                  \frac{100}{3.785411784} \]
                </p>
                <p>
                  UK MPG from km/L: \[ \text{MPG}_{UK} = K \cdot
                  \frac{100}{4.54609} \]
                </p>
              </div>

              <h2>Typical fuel economy values</h2>
              <p>
                Very roughly, you can think of these ranges for passenger cars:
              </p>
              <ul>
                <li>
                  <strong>10–12 L/100km</strong> (≈ 19–24 US MPG) – older or
                  large SUVs, city driving
                </li>
                <li>
                  <strong>7–8 L/100km</strong> (≈ 29–34 US MPG) – average modern
                  compact car
                </li>
                <li>
                  <strong>5–6 L/100km</strong> (≈ 39–47 US MPG) – efficient
                  diesel or hybrid
                </li>
                <li>
                  <strong>&lt; 4 L/100km</strong> (≈ &gt; 59 US MPG) – very
                  efficient hybrids or plug‑in hybrids
                </li>
              </ul>

              <h2>Fuel economy vs. fuel consumption</h2>
              <p>
                It’s easy to get confused because some countries report how far
                you can drive on a unit of fuel, while others report how much
                fuel you need to drive a fixed distance:
              </p>
              <ul>
                <li>
                  <strong>Economy (higher is better)</strong>: MPG, km/L, mi/L
                </li>
                <li>
                  <strong>Consumption (lower is better)</strong>: L/100km,
                  gal/100mi
                </li>
              </ul>
              <p>
                When comparing cars across regions (for example, US MPG vs
                European L/100km), always convert to the same type of measure
                first.
              </p>
            </section>
          </div>



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              <h2 class="text-xl font-semibold mb-4">About the author</h2>
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                  <a href="https://www.linkedin.com/in/ugocandido92821/" class="text-blue-600 hover:underline" target="_blank" rel="noopener">Ugo Candido</a>
                  builds financial tools and educational resources to help
                  readers make better money decisions. He focuses on practical,
                  transparent models that reflect how lenders calculate
                  payments and total cost of ownership.
                </p>
                <p class="text-sm text-gray-700 mt-3">
                  Contact: <a href="mailto:info@calcdomain.com" class="text-blue-600 hover:underline">info@calcdomain.com</a>
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            <section class="mt-10" id="methodology">
              <h2 class="text-xl font-semibold mb-4">Methodology</h2>
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                  Results use standard formulas and the values you provide.
                  Figures are estimates and may differ from lender quotes.
                  For decisions that require professional guidance, consult a
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              </div>
            </section>

        
            <section class="mt-10" id="sources">
              <h2 class="text-xl font-semibold mb-4">Sources</h2>
              <div class="bg-gray-50 border border-gray-200 rounded-lg p-4">
                <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>
              </div>
            </section>

        





<section class="bg-white p-4 rounded-lg shadow-md mt-6"><h2 class="text-lg font-semibold mb-2">Operational notes</h2><p class="text-sm text-gray-700">Fill in realistic values and keep units and timeframes consistent.</p><p class="text-sm text-gray-700 mt-2">Key entities: Conversions, Fuel, Economy, Miles per gallon (US) (mpg US), Miles per gallon (UK / Imperial) (mpg UK), Liters per 100 kilometers (L/100km), Kilometers per liter (km/L), Miles per liter (mi/L).</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>Miles per gallon (US) (mpg US)</li><li>Miles per gallon (UK / Imperial) (mpg UK)</li><li>Liters per 100 kilometers (L/100km)</li><li>Kilometers per liter (km/L)</li><li>Miles per liter (mi/L)</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: non-negative values, plausible ranges, coherent outputs.</p></section><!-- %%EEAT_STRIP%% -->
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    <script src="/assets/js/mobile-menu.js"></script>
    <script src="/search.js"></script>

    <script>
      (function () {
        const MPG_US_PER_MPG_UK = 0.83267418463; // 1 UK MPG ≈ 1.20095 US MPG -> inverse
        const KM_PER_MILE = 1.609344;
        const L_PER_US_GAL = 3.785411784;
        const L_PER_UK_GAL = 4.54609;

        const inputs = {
          mpgUs: document.getElementById("fe-mpg-us"),
          mpgUk: document.getElementById("fe-mpg-uk"),
          lPer100: document.getElementById("fe-l-per-100km"),
          kmPerL: document.getElementById("fe-km-per-l"),
          miPerL: document.getElementById("fe-mi-per-l"),
        };

        const precisionSelect = document.getElementById("fe-precision");
        const resetBtn = document.getElementById("fe-reset");
        const sampleBody = document.getElementById("fe-sample-table-body");

        let updating = false;

        function getPrecision() {
          const p = parseInt(precisionSelect.value, 10);
          return isNaN(p) ? 2 : p;
        }

        function round(value) {
          if (!isFinite(value)) return "";
          const p = getPrecision();
          return Number(value.toFixed(p));
        }

        function fromLPer100(C) {
          const kmPerL = 100 / C;
          const miPerL = (100 * KM_PER_MILE) / (100 * C); // simplifies to KM_PER_MILE / C
          const mpgUs = (100 * KM_PER_MILE) / (C * L_PER_US_GAL);
          const mpgUk = (100 * KM_PER_MILE) / (C * L_PER_UK_GAL);
          return { kmPerL, miPerL, mpgUs, mpgUk };
        }

        function updateFromLPer100(value) {
          const C = parseFloat(value);
          if (!isFinite(C) || C <= 0) {
            clearAllExcept("lPer100");
            return;
          }
          const res = fromLPer100(C);
          inputs.kmPerL.value = round(res.kmPerL);
          inputs.miPerL.value = round(res.miPerL);
          inputs.mpgUs.value = round(res.mpgUs);
          inputs.mpgUk.value = round(res.mpgUk);
        }

        function updateFromMpgUs(value) {
          const mpgUs = parseFloat(value);
          if (!isFinite(mpgUs) || mpgUs <= 0) {
            clearAllExcept("mpgUs");
            return;
          }
          const C = 235.214583 / mpgUs;
          inputs.lPer100.value = round(C);
          updateFromLPer100(C);
        }

        function updateFromMpgUk(value) {
          const mpgUk = parseFloat(value);
          if (!isFinite(mpgUk) || mpgUk <= 0) {
            clearAllExcept("mpgUk");
            return;
          }
          const C = 282.480936 / mpgUk;
          inputs.lPer100.value = round(C);
          updateFromLPer100(C);
        }

        function updateFromKmPerL(value) {
          const kmPerL = parseFloat(value);
          if (!isFinite(kmPerL) || kmPerL <= 0) {
            clearAllExcept("kmPerL");
            return;
          }
          const C = 100 / kmPerL;
          inputs.lPer100.value = round(C);
          updateFromLPer100(C);
        }

        function updateFromMiPerL(value) {
          const miPerL = parseFloat(value);
          if (!isFinite(miPerL) || miPerL <= 0) {
            clearAllExcept("miPerL");
            return;
          }
          const C = (KM_PER_MILE * 100) / (miPerL * 100); // simplifies to KM_PER_MILE / miPerL
          const Cexact = KM_PER_MILE / miPerL;
          inputs.lPer100.value = round(Cexact);
          updateFromLPer100(Cexact);
        }

        function clearAllExcept(key) {
          Object.keys(inputs).forEach((k) => {
            if (k !== key) inputs[k].value = "";
          });
        }

        function attachListeners() {
          inputs.lPer100.addEventListener("input", () => {
            if (updating) return;
            updating = true;
            updateFromLPer100(inputs.lPer100.value);
            updating = false;
          });

          inputs.mpgUs.addEventListener("input", () => {
            if (updating) return;
            updating = true;
            updateFromMpgUs(inputs.mpgUs.value);
            updating = false;
          });

          inputs.mpgUk.addEventListener("input", () => {
            if (updating) return;
            updating = true;
            updateFromMpgUk(inputs.mpgUk.value);
            updating = false;
          });

          inputs.kmPerL.addEventListener("input", () => {
            if (updating) return;
            updating = true;
            updateFromKmPerL(inputs.kmPerL.value);
            updating = false;
          });

          inputs.miPerL.addEventListener("input", () => {
            if (updating) return;
            updating = true;
            updateFromMiPerL(inputs.miPerL.value);
            updating = false;
          });

          precisionSelect.addEventListener("change", () => {
            // Re-run last non-empty field to re-round values
            const order = ["lPer100", "mpgUs", "mpgUk", "kmPerL", "miPerL"];
            for (const key of order) {
              const el = inputs[key];
              if (el.value !== "") {
                updating = true;
                switch (key) {
                  case "lPer100":
                    updateFromLPer100(el.value);
                    break;
                  case "mpgUs":
                    updateFromMpgUs(el.value);
                    break;
                  case "mpgUk":
                    updateFromMpgUk(el.value);
                    break;
                  case "kmPerL":
                    updateFromKmPerL(el.value);
                    break;
                  case "miPerL":
                    updateFromMiPerL(el.value);
                    break;
                }
                updating = false;
                break;
              }
            }
          });

          resetBtn.addEventListener("click", () => {
            Object.values(inputs).forEach((el) => (el.value = ""));
          });
        }

        function buildSampleTable() {
          const sampleL = [4, 5, 6, 7, 8, 10, 12];
          const rows = sampleL
            .map((C) => {
              const res = fromLPer100(C);
              const mpgUs = (100 * KM_PER_MILE) / (C * L_PER_US_GAL);
              const mpgUk = (100 * KM_PER_MILE) / (C * L_PER_UK_GAL);
              return `
          <tr>
            <td class="px-3 py-1.5">${C.toFixed(1)}</td>
            <td class="px-3 py-1.5">${mpgUs.toFixed(1)}</td>
            <td class="px-3 py-1.5">${mpgUk.toFixed(1)}</td>
            <td class="px-3 py-1.5">${res.kmPerL.toFixed(2)}</td>
          </tr>
        `;
            })
            .join("");
          sampleBody.innerHTML = rows;
        }

        attachListeners();
        buildSampleTable();
      })();
    </script>

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