Instant Calorie Calculator
BMR · TDEE · Macros · Calorie Cycling

Free Calorie Calculator
for Weight Loss, Gain & Maintenance.

The best online calorie calculator for weight loss, muscle gain, and maintenance. Calculate your TDEE, BMR, macros, and dieting calories instantly — 100% free, no signup.

✓ 0ms Latency Calculations
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✓ US & Metric Auto-Convert
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✓ Macro & Zigzag Schedules
Input System
15 - 80 yrs
years
cm
kg

Moderate: 45-60 min elevated heart rate training 4-5 days/week.

kg
Daily Maintenance Calorie Goal
2,284kcal / day

Estimated Total Daily Energy Expenditure (TDEE) to maintain your current weight.

Basal Metabolism (BMR)
1,575 kcal
Trajectory Plans
Mild Weight Loss-0.25 kg / wk
Gentle 250 kcal daily deficit · Minimal hunger
2,034 kcal
Recommended Pace
Standard Weight Loss-0.50 kg / wk
500 kcal daily deficit · Sustainable fat reduction
1,784 kcal
Extreme Weight Loss-1.00 kg / wk
1,000 kcal daily deficit · Supervised / short-term only
1,284 kcal
Nutrient Distribution

Macronutrient Target Split

Grams calculated for 1,784 kcal daily intake

PROTEIN (4 kcal/g)40%
178 grams
714 kcal
CARBOHYDRATES (4 kcal/g)35%
156 grams
624 kcal
DIETARY FATS (9 kcal/g)25%
50 grams
446 kcal
Metabolic Protection

Zigzag Calorie Cycling (7-Day Schedule)

Alternating calories between workout and rest days prevents leptin drops and metabolic plateau while maintaining the weekly deficit.

Weekly Target: 12,488 kcal
Utility Module

Food Energy Unit Converter

Instantly convert between food calories, international kilojoules, small calories, and scientific joules with two-way real-time recalculation.

1 kcal
4.184 kJ
1 kJ
0.239 kcal
1 kcal
1,000 cal
1 kJ
1,000 J
Complete Guide

Calorie Calculator: Free Daily Calorie Needs for Every Goal

Everything you need to know about using a calorie calculator to lose weight, gain muscle, or maintain your physique — free, instant, and science-based.

What is a calorie calculator?

A calorie calculator estimates how many calories your body needs per day based on your age, gender, height, weight, and activity level. Our free tool goes further: it calculates your Basal Metabolic Rate (BMR) using the Mifflin-St Jeor, Revised Harris-Benedict, or Katch-McArdle formulas, multiplies it by your activity factor to find your Total Daily Energy Expenditure (TDEE), then builds personalized deficit and surplus targets. Unlike generic charts, this calorie calculator free tool recalculates instantly as you type — no page reloads, no signup, no paywall. Whether you want to diet down, bulk up, or simply eat at maintenance, you get your maintenance calories, three weight-loss tiers, three weight-gain tiers, a full macronutrient split, and a 7-day zigzag cycling schedule in one place.

Calories are simply a unit of food energy. If you consistently eat more than your TDEE, you gain weight; eat less, and you lose weight. That energy-balance rule sounds simple, but your exact numbers depend on body size, muscle mass, age-related metabolic slowdown, and how active you really are. That is why using an accurate online calculator matters far more than guessing or copying someone else's meal plan.

How to use this online calorie calculator

Using the best online calorie calculator should take less than a minute. Select US or Metric units, enter your gender, age, height, and weight, then choose the activity level that honestly matches your week — from sedentary desk work to extra-active manual labor. The tool instantly shows your maintenance calories, BMR, and projected timelines. Add an optional target weight to see your estimated goal date, open Advanced Settings to switch BMR formulas or energy units (kcal / kJ), and pick a macro preset in the macro breakdown section. For best accuracy, weigh yourself first thing in the morning, measure height without shoes, and pick activity conservatively — most people overestimate exercise by one full tier.

Calorie calculator for weight loss: eat less without starving

A calorie calculator for weight loss answers the most common diet question: how little should I eat to drop fat safely? Our weight loss calorie calculator free module creates three deficits from your TDEE: mild (−250 kcal/day, about −0.25 kg/week), standard (−500 kcal/day, about −0.5 kg/week), and extreme (−1000 kcal/day, about −1 kg/week). For most people, the standard pace is ideal — it produces steady fat loss while preserving muscle, hormones, and adherence. Use this calorie calculator to lose weight by selecting the Standard Weight Loss card, following its daily target for 2–3 weeks, then comparing your average scale weight. If you are losing 0.4–0.7% of body weight per week, stay the course. If progress stalls for three weeks, drop another 100–150 kcal or add 2,000 daily steps rather than crash-dieting.

Successful calorie calculator free dieting is not just about the number — protein and sleep decide whether lost weight is fat or muscle. Aim for 1.6–2.2 g of protein per kg of body weight, keep resistance training 3–4 times per week, and use our zigzag calorie cycling schedule to place higher calories on hard training days. That pattern keeps leptin higher, workouts stronger, and hunger lower than eating the same low number every day.

Maintenance calorie calculator: find your true TDEE

A maintenance calorie calculator estimates the calories needed to keep your current weight stable — your TDEE. This number is your anchor for every other goal: subtract for cutting, add for bulking, or match it during recomposition and maintenance phases. Our calculator shows maintenance front and center, alongside BMR, so you can see exactly how much of your burn comes from simply being alive versus moving and training. If your weight stays within ±0.5 kg over 2–3 weeks while eating near that target, your maintenance is dialed in. Active commuters, parents chasing toddlers, and fidgeters often maintain 200–300 kcal above formula predictions because of NEAT — non-exercise activity that trackers miss. When in doubt, treat the estimate as a starting point, track intake honestly for 14 days, and adjust based on the trend.

Calorie calculator to gain weight and build muscle

A smart calorie calculator to gain weight prevents the classic dirty-bulk mistake of eating far too much. Our lean-gain tiers add +250 kcal/day (+0.25 kg/week), +500 kcal/day (+0.5 kg/week), or +1000 kcal/day (+1 kg/week) to your TDEE. Beginners and hardgainers usually grow best on the moderate +250–350 kcal surplus with high protein and progressive overload. This online calorie calculator for muscle gain pairs each surplus with gram-specific protein, carb, and fat targets, so extra calories fuel training instead of becoming excess fat. Choose the High Protein preset (35/40/25) or Balanced preset (40/30/30), train each muscle group twice weekly, sleep 7–9 hours, and aim to gain roughly 0.25–0.5% of body weight per week. If the scale jumps faster for two weeks straight, trim 100–200 kcal; if strength stalls and weight is flat, add 100–150 kcal.

Why this is the best online calorie calculator — and 100% free

Most calorie tools give you one number and stop. We built the best online calorie calculator to cover the full workflow: three validated BMR equations including Katch-McArdle for athletes who know their body-fat percentage, seven activity multipliers, US and metric auto-conversion, kcal-to-kJ switching, copy-to-clipboard summaries, macro presets for balanced, high-protein, and low-carb dieting, a 7-day zigzag plan to beat plateaus, and a built-in energy converter for kcal, cal, kJ, and joules. Everything runs locally in your browser for instant privacy-friendly results, and every feature is unlocked in this calorie calculator free version — no account, no trial, no locked macros. Bookmark it, recalculate every 4–6 weeks as your weight changes, and use the scientific references in our formulas guide to understand the math behind your plan.

Disclaimer: this educational estimator is not medical advice. Very low-calorie diets (under 1,200 kcal for women or 1,500 kcal for men), pregnancy, eating disorders, thyroid conditions, and competitive weight cuts require guidance from a physician or registered dietitian.

Scientific Methodology

How Calorie Calculation Works

Your daily calorie expenditure is governed by human thermodynamics and validated metabolic equations.

1Basal Metabolic Rate (BMR ~60-70%)

The calories burned just keeping your organs, cellular repair, breathing, and autonomic nervous system alive while lying motionless.

2NEAT (Non-Exercise Activity ~15%)

Non-Exercise Activity Thermogenesis: typing, standing, pacing, walking around the house, and daily subconscious fidgeting.

3Exercise Activity (EAT ~5-15%)

Deliberate sports and structured workouts: weightlifting, jogging, swimming, cycling, and high-intensity interval training.

4Thermic Effect of Food (TEF ~10%)

The metabolic cost of digesting, absorbing, and assimilating nutrients. Protein has the highest TEF (~20-30%), followed by carbs (~5-10%) and fats (~0-3%).

Clinical BMR Formulas Explained

1. Mifflin-St Jeor Equation (1990)Gold Standard

Consistently proven by the Academy of Nutrition and Dietetics to be the most reliable formula for modern sedentary-to-moderate lifestyles.

Men: BMR = (10 × weight in kg) + (6.25 × height in cm) - (5 × age) + 5
Women: BMR = (10 × weight in kg) + (6.25 × height in cm) - (5 × age) - 161
2. Revised Harris-Benedict Equation (Roza & Shizgal, 1984)Clinical Classic

A 1984 revision of the original 1919 equation, recalibrated using modern metabolic cart gas exchange measurements.

Men: BMR = 88.362 + (13.397 × kg) + (4.799 × cm) - (5.677 × age)
Women: BMR = 447.593 + (9.247 × kg) + (3.098 × cm) - (4.330 × age)
3. Katch-McArdle Formula (Lean Mass Based)For Athletes & Bodybuilders

Calculates Resting Daily Energy Expenditure (RDEE) from Lean Body Mass (LBM). Because adipose tissue has minimal metabolic cost compared to skeletal muscle, this formula is exceptionally accurate for lean and athletic individuals.

BMR = 370 + (21.6 × Lean Body Mass in kg)
Where Lean Body Mass = Weight × (1 - (Body Fat % / 100))
FAQ — Calorie Calculator

Frequently Asked Questions

Straight answers about deficits, TDEE accuracy, daily targets, and fat-loss dieting — powered by the free calorie calculator above.

What is calorie deficit calculator?

A calorie deficit calculator is a type of calorie calculator for weight loss. It first estimates your maintenance calories (TDEE) from your age, gender, height, weight, and activity level, then subtracts a daily amount — typically 250, 500, or 1,000 kcal. Since roughly 7,700 kcal equals 1 kg of body fat, a 500 kcal daily deficit predicts about 0.5 kg of fat loss per week. Use the Trajectory Plans above to pick a mild, standard, or extreme deficit.

How much weight will I lose calorie calculator?

Enter your current weight and your target weight in the calculator above and it projects your timeline automatically. As a rule: a 250 kcal daily deficit leads to about 0.25 kg per week, 500 kcal to about 0.5 kg per week, and 1,000 kcal to about 1 kg per week. Actual loss varies with water weight, sleep, stress, and tracking accuracy — compare your average scale weight over 2–3 weeks and adjust by 100–150 kcal if you stall.

What is the most accurate calorie calculator?

The most accurate calorie calculator uses the Mifflin-St Jeor equation, which the Academy of Nutrition and Dietetics rates as the clinical gold standard for most adults. If you know your body-fat percentage and are lean or athletic, the Katch-McArdle formula (based on lean body mass) is more accurate. No formula is perfect — treat the result as a starting TDEE, track intake honestly for 14 days, then adjust to your real-world trend.

How do I calculate my calories?

In four steps: 1) Calculate BMR — the calories you burn at rest — with Mifflin-St Jeor using weight, height, age, and gender. 2) Multiply BMR by an activity factor (1.2 sedentary to 1.9 extra active) to get TDEE, your maintenance calories. 3) Set your goal: subtract 300–500 kcal to lose weight, add 250–500 kcal to gain muscle, or match TDEE to maintain. 4) Split calories into protein, carbs, and fat. This page does all four steps instantly.

How many calories for a 70 kg man?

It depends on height, age, and activity. As an example, a 30-year-old man weighing 70 kg at 178 cm burns roughly 1,670 kcal at rest (BMR). That becomes about 2,000 kcal sedentary, 2,300 kcal with light exercise 1–3 days per week, 2,400–2,600 kcal with moderate training 4–5 days per week, and 2,900+ kcal when very active. Enter your exact stats in the free calorie calculator above for your personal number.

Can I eat 1200 calories daily?

For most adults, 1,200 calories daily is too low to sustain without medical supervision. It can cause muscle loss, fatigue, hair shedding, hormonal disruption, and rebound binge eating. General minimums are around 1,500 kcal for men and 1,200 kcal for short, sedentary women — and only short-term. A moderate 300–500 kcal deficit from your own TDEE is safer and easier to stick to. Consult a physician or dietitian before any very-low-calorie diet.

Does 10,000 steps burn 200 calories?

Usually more. A 70 kg person burns roughly 300–400 kcal walking 10,000 steps (about 7–8 km), depending on pace, terrain, and body weight — heavier people burn more, lighter people less. The old 200-calorie figure underestimates it. Brisk walking, hills, and added body weight raise the burn, but do not eat back every estimated exercise calorie: trackers overestimate by 20–30%, so eat back at most half.

Can I lose 1kg a week?

Yes, but it requires roughly a 1,100 kcal daily deficit (7,700 kcal per kg of fat), which is aggressive. It is occasionally appropriate for people with higher body weight over a short period, but most people lose significant muscle, battle extreme hunger, and regain weight afterward. A 0.5 kg per week pace (500 kcal deficit) preserves muscle, hormones, and adherence far better. Use the Extreme Weight Loss tier only short-term and ideally supervised.

What burns fat very quickly?

Nothing burns fat instantly — but the fastest sustainable combination is a moderate calorie deficit plus high protein (1.6–2.2 g per kg), resistance training 3–4 times per week, 8,000–10,000 daily steps, and 7–9 hours of sleep. Protein has the highest thermic effect (20–30%), lifting preserves muscle so lost weight is fat, and walking raises NEAT without spiking hunger like excessive cardio does. Avoid fat-burner pills and crash diets; consistency beats intensity.

How many calories should I eat daily?

Eat at your TDEE to maintain weight, 300–500 kcal below it to lose fat, or 250–500 kcal above it to gain muscle. Sedentary women typically maintain on 1,600–2,000 kcal and men on 2,000–2,500 kcal; active people often need 2,500–3,200+ kcal. The fastest answer: run the maintenance calorie calculator above with your stats and activity level — that personal TDEE is your daily anchor for every goal.

What is the best diet for fat loss?

The best diet for fat loss is a high-protein, whole-food diet you can stick to in a moderate deficit. Aim for 1.6–2.2 g protein per kg, fill half your plate with vegetables and fruit, choose whole grains and legumes for fiber, keep added sugars and alcohol low, and drink water before meals. Mediterranean-style and high-protein patterns have the strongest evidence — but adherence decides results, so pair any eating pattern with the zigzag calorie schedule and macro targets above.