Free calorie calculator for daily needs & weight goals

How this calorie calculator works

Enter age, gender, height, weight, and activity, then press Calculate to estimate how many calories you need per day. The tool computes BMR with a proven equation, scales it by activity for maintenance calories, then shows mild, standard, and aggressive weight-loss (or gain) targets.

1. Enter your stats

   Use cm or feet/inches for height, and kg or pounds for weight. Pick the activity level that best matches a typical week.

2. Choose a BMR formula

   Mifflin-St Jeor is recommended for most people. Switch to Katch-McArdle if you know body fat percentage for a lean-mass-based estimate.

3. Press Calculate

   Maintenance is 100% of estimated TDEE. Mild loss trims about 250 calories/day (~0.25 kg/week), standard loss about 500 (~0.5 kg/week), and extreme about 1,000 (~1 kg/week).

4. Use zigzag schedules if you plateau

   The detailed results include two 7-day zigzag plans that keep the same weekly calorie budget with varied daily targets.

Privacy note: all math runs locally in your browser. Nothing is uploaded to Small Tools Buddy servers.

BMR equations used by the calculator

Results are estimates based on population averages. Mifflin-St Jeor is generally preferred over revised Harris-Benedict for modern adults. Katch-McArdle estimates resting burn from lean body mass when body fat is known — often better for leaner people.

BMR alone assumes rest. Multiplying by an activity factor (about 1.2–1.9) accounts for daily movement. Roughly 3,500 calories ≈ 1 pound (0.45 kg) of body fat, so a 500 calorie daily deficit theoretically yields about 1 lb / 0.5 kg lost per week.

Why use this free calorie calculator

• Live TDEE and weight-loss calorie targets
• cm / ft·in and kg / lb unit toggles
• Mifflin, Harris-Benedict, and Katch-McArdle
• Seven activity levels from BMR to extra active
• Mild, standard, and extreme deficit plans
• Optional weight-gain calorie targets
• Two zigzag diet schedule templates
• Private — runs entirely in your browser

Calorie counting for weight loss

Calorie counting works by creating a sustainable deficit: calories in versus calories out. It is not perfect — labels, digestion, and water weight add noise — but it remains one of the most practical ways to steer body weight when paired with protein, fiber, sleep, and strength training.

1. Estimate maintenance

   Use this calculator (prefer Katch-McArdle if you know body fat). Treat the number as a starting estimate, not a prescription.

2. Set a realistic weekly goal

   Aim for about 0.25–0.5 kg (0.5–1 lb) per week for most people. Faster loss raises the risk of muscle loss, fatigue, and rebound. Check with a doctor or RDN before large deficits.

3. Track intake and activity

   Apps, spreadsheets, or a notebook all work. Weigh portions for a short calibration period so restaurant guesses improve quickly.

4. Review weekly, not hourly

   Daily scale swings are mostly water. Weigh under similar conditions (e.g. morning, after bathroom, before breakfast) and average the week before changing calories.

Food quality still matters. Minimally processed plants and lean proteins usually keep you fuller per calorie than ultra-processed snacks. Drinks can quietly add a large share of daily calories — water, tea, and unsweetened coffee are the easiest wins.

Zigzag calorie cycling explained

Long, flat deficits can feel restrictive and may encourage the body to adapt. Zigzag (or calorie cycling) keeps the same weekly total while mixing higher and lower days — for example two days near maintenance and five slightly lower, or a gradual rise and fall across the week.

High and low days often differ by roughly 200–300 calories for moderate activity (more if you train hard). Use higher days for hard workouts or social meals; recover the difference on quieter days. The calculator’s result panel builds both schedule styles from your numbers.

How many calories do you need?

Needs vary with age, size, sex, activity, and health. A tall, active 25-year-old typically needs far more than a shorter, sedentary older adult. Broad U.S. guidance often places adult men around 2,000–3,000 calories/day and adult women around 1,600–2,400 to maintain weight — your calculated TDEE is more specific.

Eating too little can leave energy for survival only and undermine training, hormones, and adherence. Unless a clinician is supervising, many experts suggest women stay at or above ~1,200 calories/day and men at or above ~1,500.

Calories from food components

Most dietary calories come from fat, protein, and carbohydrate (alcohol also contributes). Approximate energy density:

“Empty calories” (added sugars, many solid fats, sugary drinks) add energy with little nutrition. High-calorie foods are not automatically unhealthy — nuts and avocados are calorie-dense but nutrient-rich in sensible portions.

Calories in common foods

Approximate values for quick planning. Brands and preparation change the real count — check labels when precision matters.

Sample 1,200 / 1,500 / 2,000 calorie day

Illustrative meal outlines (calories in parentheses). Swap foods with similar calories and protein to match preferences.

Calories burned in common exercises (1 hour)

Estimates vary with intensity and fitness. Figures below are typical for continuous activity.

*Yoga row is a rough average for gentle practice; hot or power yoga burns more.

Who this calculator is for

• People starting a cut or bulk who need a clear daily calorie target
• Lifters and runners comparing BMR formulas or activity multipliers
• Anyone tracking macros who wants maintenance calories before setting protein/carb/fat splits
• Coaches and clients who want a fast, private estimate without creating an account

Calorie calculator FAQs

Quick answers about BMR, deficits, formulas, and privacy.