BMI Calculator

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Now calculate your daily calorie needs, fat loss targets, and muscle gain plan with our advanced BMR calculator.

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(function () {function initBMI() {const boxes = document.querySelectorAll(“.bmi-box”);boxes.forEach(function (box) {const weightBtn = box.querySelector(“.bmi-weight-btn”); const heightBtn = box.querySelector(“.bmi-height-btn”); const weightInput = box.querySelector(“.bmi-weight”);if (weightBtn && weightInput && !weightBtn.dataset.initialized) {weightBtn.dataset.initialized = “true”;weightBtn.addEventListener(“click”, function () {let unit = weightInput.dataset.unit || “kg”; let value = parseFloat(weightInput.value);if (unit === “kg”) {weightInput.dataset.unit = “lbs”; weightInput.placeholder = “Weight (lbs)”; weightBtn.textContent = “KG”;if (!isNaN(value) && value > 0) { weightInput.value = (value * 2.20462).toFixed(1); }} else {weightInput.dataset.unit = “kg”; weightInput.placeholder = “Weight (kg)”; weightBtn.textContent = “LBS”;if (!isNaN(value) && value > 0) { weightInput.value = (value / 2.20462).toFixed(1); }}});}if (heightBtn && !heightBtn.dataset.initialized) {heightBtn.dataset.initialized = “true”;heightBtn.addEventListener(“click”, function () {const cmInput = box.querySelector(“.bmi-height-cm”); const wrapper = box.querySelector(“.height-feet-inches”); const ftInput = box.querySelector(“.bmi-height-ft”); const inInput = box.querySelector(“.bmi-height-in”);if (!cmInput || !wrapper) return;const cmVisible = window.getComputedStyle(cmInput).display !== “none”;if (cmVisible) {const cm = parseFloat(cmInput.value);if (!isNaN(cm) && cm > 0) {const totalInches = cm / 2.54;let feet = Math.floor(totalInches / 12); let inches = Math.round(totalInches % 12);if (inches === 12) { feet++; inches = 0; }if (ftInput) ftInput.value = feet; if (inInput) inInput.value = inches; }cmInput.style.display = “none”; wrapper.style.display = “flex”; heightBtn.textContent = “cm”;} else {const feet = parseFloat(ftInput ? ftInput.value : 0) || 0;const inches = parseFloat(inInput ? inInput.value : 0) || 0;if (feet > 0 || inches > 0) {cmInput.value = Math.round((feet * 12 + inches) * 2.54);}cmInput.style.display = “block”; wrapper.style.display = “none”; heightBtn.textContent = “ft/in”; }});}});}if (document.readyState === “loading”) { document.addEventListener(“DOMContentLoaded”, initBMI); } else { initBMI(); }})();

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Frequently Asked Questions

Everything you need to know about our health & fitness tools

Yes. Our tools use scientifically validated formulas, such as the Mifflin-St Jeor equation for BMR, the Katch-McArdle formula, and established athletic standards (like the Epley formula for 1RM). While they provide highly precise estimations, individual metabolic rates can vary.

No, all calculators and tools on The Calorie Lab are 100% free to use. There are no subscriptions, paywalls, or mandatory sign-ups required to get your results.

If your goal is weight management or body composition, start with our BMR / TDEE Calculator to find your daily energy needs. From there, use the Macro Calculator or Calorie Deficit Calculator to align your nutrition with your goals.

No. We prioritize your privacy. All calculations happen directly inside your web browser. We do not store, track, or share any personal health or body data you enter into our tools.

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