Calculators

Calories Calculator

Select Calculation Type:

Weight (kg):

Height (cm):

Underweight Healthy Overweight Obese

Enter your weight

Body Mass Index (BMI) is a measure of body fat based on height and weight.

Your BMI Result:

Understanding Calories & Nutrition

Calories are units of energy that our bodies use to function. The number of calories you need depends on several factors including your age, gender, weight, height, and activity level.

BMI (Body Mass Index): A value derived from height and weight that categorizes you as underweight, normal weight, overweight, or obese.

BMR (Basal Metabolic Rate): The number of calories your body needs to perform basic life-sustaining functions.

Daily Calorie Needs: The total number of calories you need per day based on your BMR and activity level.

Use this calculator to determine your BMI, BMR, and daily calorie requirements to help you maintain a healthy lifestyle!

Height (cm):

`); setHTML(iconBox, ''); infoBox.textContent = 'Body Mass Index (BMI) is a measure of body fat based on height and weight.'; resultTitle.textContent = 'Your BMI Result:'; } function viewBMR() { setHTML(inputsBox, `

Age:

Gender:

Weight (kg):

Height (cm):

`); setHTML(iconBox, ''); infoBox.textContent = 'Basal Metabolic Rate (BMR) is the number of calories your body needs at rest.'; resultTitle.textContent = 'Your BMR Result:'; } function viewCalories() { setHTML(inputsBox, `

Age:

Gender:

Weight (kg):

Height (cm):

Activity Level:

`); setHTML(iconBox, ''); infoBox.textContent = 'Daily calorie needs are based on your BMR multiplied by your activity level.'; resultTitle.textContent = 'Your Daily Calories:'; } function viewFood() { setHTML(inputsBox, `

Food Item:

Quantity:

`); setHTML(iconBox, ''); infoBox.textContent = 'Calorie content varies by food type and quantity.'; resultTitle.textContent = 'Food Calories:'; } function changeType() { const t = typeSelect.value; if (t === 'bmi') viewBMI(); else if (t === 'bmr') viewBMR(); else if (t === 'calories') viewCalories(); else viewFood(); // hide result on change resultBox.style.display = 'none'; // reset meter status updateMeter(); } function updateMeter() { const wEl = $('#ct-weight'); const hEl = $('#ct-height'); if (wEl && hEl && wEl.value && hEl.value) { const weight = parseFloat(wEl.value); const height = parseFloat(hEl.value) / 100; if (weight > 0 && height > 0) { const bmi = weight / (height * height); let pos, txt, col; if (bmi < 18.5) { pos = (bmi / 18.5) * 25; txt = 'Underweight'; col = '#FF9800'; } else if (bmi < 25) { pos = 25 + ((bmi - 18.5) / (25 - 18.5)) * 35; txt = 'Healthy Weight'; col = '#4CAF50'; } else if (bmi < 30) { pos = 60 + ((bmi - 25) / (30 - 25)) * 20; txt = 'Overweight'; col = '#FFEB3B'; } else { pos = 80 + (Math.min(bmi, 40) - 30) / (40 - 30) * 20; txt = 'Obese'; col = '#F44336'; } pos = Math.max(0, Math.min(100, pos)); const oscillation = Math.sin(Date.now() / 500) * 0.5; needle.style.left = `calc(${pos}% + ${oscillation}px)`; status.textContent = `${txt} (BMI: ${bmi.toFixed(1)})`; status.style.color = col; return; } } needle.style.left = '0%'; status.textContent = 'Enter your weight and height'; status.style.color = '#555'; } function calc() { const t = typeSelect.value; let result = 0; try { if (t === 'bmi') { const w = parseFloat($('#ct-weight').value); const h = parseFloat($('#ct-height').value) / 100; if (!(w > 0 && h > 0)) throw new Error('Please enter valid weight and height'); result = w / (h * h); resultValue.innerHTML = result.toFixed(1) + ' BMI'; } else if (t === 'bmr') { const age = parseInt($('#ct-age').value); const gender = $('#ct-gender').value; const w = parseFloat($('#ct-weight').value); const h = parseFloat($('#ct-height').value); if (!(age > 0 && w > 0 && h > 0)) throw new Error('Please enter valid values for all fields'); result = gender === 'male' ? 10 * w + 6.25 * h - 5 * age + 5 : 10 * w + 6.25 * h - 5 * age - 161; resultValue.innerHTML = Math.round(result) + ' calories/day'; } else if (t === 'calories') { const age = parseInt($('#ct-age').value); const gender = $('#ct-gender').value; const w = parseFloat($('#ct-weight').value); const h = parseFloat($('#ct-height').value); const act = parseFloat($('#ct-activity').value); if (!(age > 0 && w > 0 && h > 0)) throw new Error('Please enter valid values for all fields'); const bmr = gender === 'male' ? 10 * w + 6.25 * h - 5 * age + 5 : 10 * w + 6.25 * h - 5 * age - 161; result = bmr * act; resultValue.innerHTML = Math.round(result) + ' calories/day'; } else { const item = $('#ct-food').value; const qty = parseInt($('#ct-qty').value); if (!(qty > 0)) throw new Error('Please enter a valid quantity'); const kcal = { apple: 95, banana: 105, chickenBreast: 165, pasta: 131, pizza: 285, salad: 15 }; result = (kcal[item] || 0) * qty; resultValue.innerHTML = Math.round(result) + ' calories'; } resultBox.style.display = 'block'; } catch (e) { alert(e.message); } } // Events typeSelect.addEventListener('change', changeType); root.addEventListener('input', (e) => { if (e.target && (e.target.id === 'ct-weight' || e.target.id === 'ct-height')) updateMeter(); }); calcBtn.addEventListener('click', calc); // Init changeType(); setInterval(updateMeter, 100); })();

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