Calorie Calculator

The Calorie Calculator is a free online tool that calculate daily calorie needs for weight loss, maintenance, or muscle gain. uses mifflin-st jeor and harris-benedict bmr formulas with activity multipliers and 4/8/12-week weight projections.. It runs entirely in your browser with no installation or sign-up needed.

Mifflin-St Jeor is the current clinical standard and generally within 10% of measured BMR. Harris-Benedict (1984 revised) tends to slightly overestimate. We show both so you can compare.

One pound of fat = ~3,500 kcal, so a ~500 kcal/day deficit loses ~1 lb/week. The calculator floors daily calories at 1000 for safety.

The projection is linear and assumes perfect adherence. Real bodies adapt (BMR drops, NEAT decreases) and water/glycogen swings distort weekly scale readings. Track 2-4 week trends.

Yes, the Calorie Calculator is 100% free with no registration, no hidden fees, and no usage limits. All processing happens locally in your browser, ensuring complete privacy.

Absolutely. The Calorie Calculator processes everything client-side in your browser. No data is uploaded to or stored on any server. Your content remains private on your device at all times.

Yes, the Calorie Calculator is fully responsive and works on smartphones and tablets. You can use it on any device with a modern web browser -- no app download required.

No account or registration is needed. Simply open the Calorie Calculator in your browser and start using it immediately. There are no sign-up walls or usage restrictions.

Simply enter your input in the provided field, adjust any settings to your preference, and the tool will process it instantly. You can then copy the result to your clipboard or download it.

The Calorie Calculator works in all modern browsers including Chrome, Firefox, Safari, Edge, and Opera. For the best experience, use the latest version of your preferred browser.

BMR (basal metabolic rate) is the energy your body burns at complete rest just to keep organs running — it ignores any movement. Maintenance calories, also called TDEE (total daily energy expenditure), is your BMR multiplied by an activity factor that accounts for exercise, walking, and daily movement. So if your BMR is 1,700 kcal and you train moderately, your maintenance might be around 2,600 kcal. Eating at maintenance holds your weight steady; eating below it loses weight and above it gains. This calculator shows BMR and maintenance as separate numbers, then derives a goal target from there. It multiplies BMR by activity factors from 1.2 (sedentary) to 1.9 (extra active), so pick the activity level that matches your real week to get a maintenance figure you can trust as your baseline.

To lose weight you need to eat below your maintenance calories, and the size of that gap sets your pace. Because a pound of fat stores roughly 3,500 calories, a deficit of about 500 calories a day loses close to one pound per week, while a 250-calorie deficit loses about half a pound. A common starting point is a 300-to-500 calorie daily deficit, which is aggressive enough to show progress but gentle enough to keep energy and adherence high. Larger deficits work faster but are harder to sustain and can cost muscle. This calculator offers eight goal levels from a 2 lb/week cut down to 0.25 lb/week, and it never returns a target below 1,000 kcal for safety. Enter your details to see the exact calorie number for the loss rate you choose.

Pick the activity level that reflects your typical week, not your best week or your goal. Sedentary (×1.2) fits a desk job with little or no exercise. Lightly active (×1.375) means light workouts one to three days a week. Moderately active (×1.55) covers moderate exercise three to five days. Very active (×1.725) is hard training six to seven days, and extra active (×1.9) adds a physically demanding job on top of heavy training. Most people who exercise a few times a week but otherwise sit overestimate here, so when in doubt choose the lower option. The multiplier already includes your workouts, so you should not add exercise calories again on top. This calculator lists each level with its multiplier, so you can compare two settings and see how much your maintenance number shifts.

The formulas behind this calculator apply a sex-specific adjustment because, on average, men carry more lean muscle mass than women at the same height and weight, and muscle burns more energy at rest than fat. In the Mifflin-St Jeor equation the body of the formula is identical for both sexes, but men add 5 to the result while women subtract 161, a gap of 166 calories. That difference flows through to maintenance and goal calories too, since both are built on BMR. It is a population average, so an individual very muscular woman or a leaner man may not fit the pattern exactly. The estimate is a starting point, not a measurement. Enter your sex along with age, height, and weight to get the figure tuned to your profile, then adjust over time based on real results.

No — a calorie calculator answers how much to eat, not what to eat, and those are different questions. Your daily target sets the total energy budget, but two diets with the same calories can produce very different results for body composition, energy, and hunger depending on their protein, fiber, and food quality. For losing fat while keeping muscle, adequate protein and mostly whole foods matter a great deal even when calories are identical. This tool gives you the calorie number and a weight projection; it does not split that number into protein, carbs, and fat. To turn your target into grams of each macronutrient, take the goal calories from here and feed them into a macro calculator. Run your numbers below, then build a food plan that fits the total while prioritizing protein and whole foods.