Calorie Calculator
Wondering how many calories you should eat in a day? This free calorie calculator turns your body details and your goal into one clear daily calorie target, whether you want to lose weight, maintain, or gain, plus a simple starting point for your protein, carbs, and fat.
What this calorie calculator does
Weight change comes down to one simple idea: energy in versus energy out. Eat fewer calories than your body burns and you lose weight; eat more and you gain. This calculator works out how much your body burns (your TDEE), then adjusts that number up or down based on the goal you choose, so you get a single, realistic daily calorie target instead of a vague guess.
It also splits that target into macronutrients, protein, carbohydrates, and fat, to give you a sensible starting point. You do not have to hit these perfectly. They are guide rails, not rules.
What your calorie target means
The big number is roughly how many calories to eat each day to move toward your goal at the pace you picked. Here is how to read it:
- Losing weight: your target sits below your maintenance calories. A 500-calorie daily gap is a classic, sustainable choice that tends to produce about half a kilogram (one pound) of loss per week.
- Maintaining: your target equals your maintenance calories.
- Gaining weight: your target sits above maintenance, which supports gradual gain, ideally muscle if you strength train.
To protect your health, this tool never recommends dropping below about 1,200 calories a day for women or 1,500 for men. Very low intakes are hard to sustain and can cost you energy, muscle, and nutrients.
How the calculation works
There are three steps behind the scenes:
- BMR. We estimate the calories you burn at rest using the Mifflin-St Jeor equation, the same formula dietitians rely on.
- TDEE. We multiply your BMR by an activity factor (1.2 to 1.9) to get your total daily burn.
- Goal adjustment. We add or subtract calories based on your chosen pace. Because roughly 7,700 calories equals about one kilogram of body fat, a 500-calorie daily deficit works out to around half a kilogram a week.
Macro split
We divide your target using a balanced, beginner-friendly split of about 30% protein, 40% carbohydrates, and 30% fat, then convert to grams (protein and carbs have 4 calories per gram, fat has 9).
Example calculation
Take a 35-year-old man, 80 kg, 178 cm, moderately active, who wants to lose weight at about half a kilogram per week.
- BMR is about 1,750 calories.
- TDEE = 1,750 × 1.55 = about 2,700 calories.
- Subtract 500 for weight loss, giving a target of about 2,200 calories a day.
- Macros land near 165 g protein, 220 g carbs, and 73 g fat.
Your beginner action plan
- Set your target using the calculator, then round to an easy number you will remember.
- Hit your protein first. It keeps you full and protects muscle while you lose fat.
- Track for two weeks with a food app so you learn what your portions really contain.
- Weigh yourself a couple of times a week and watch the trend, not the daily noise.
- Adjust by about 150 calories if progress stalls for two to three weeks.
- Add movement. Calories are only half the story, exercise builds strength and health. Start with our home-workout guide for beginners or a weight-loss routine.
Common mistakes to avoid
- Cutting too hard. Crash diets backfire. A moderate deficit is easier to stick to and keeps your energy up.
- Forgetting drinks and extras. Oils, sauces, sodas, and coffee add up fast and are easy to miss.
- Eating back exercise calories. Your activity level already accounts for typical workouts.
- Ignoring protein. Too little makes weight loss harder and hungrier.
- Never recalculating. As your weight changes, so does your calorie need, so update it every few kilograms.
Helpful tips
- Fill half your plate with vegetables to stay full on fewer calories.
- Plan meals ahead so you are not deciding while hungry.
- Liquid calories are the easiest to cut without feeling deprived.
- Consistency across the week beats being perfect for one day and giving up the next.
Frequently asked questions
How many calories should I eat a day?
It depends on your age, sex, size, activity, and goal. Enter those above and the calculator gives you a personalised daily target. As a rough guide, many adults maintain on 2,000 to 2,500 calories, but your real number can be quite different.
How many calories to lose weight?
Eat about 500 calories below your maintenance level for a steady loss of roughly half a kilogram (one pound) per week. The calculator does this maths for you when you pick a weight-loss goal.
How many calories should I eat to lose weight fast?
A larger deficit speeds things up but is harder to sustain and riskier. We cap targets at safe minimums (about 1,200 calories for women, 1,500 for men). Faster is not always better, and slow, steady loss is easier to keep off.
How do I calculate my daily calories?
Estimate your BMR, multiply by an activity factor to get your TDEE, then add or subtract calories for your goal. This tool automates all three steps.
Are these calorie numbers exact?
No. They are well-researched estimates, usually within about 10 percent. Use your real-world results over two to three weeks to fine-tune your target.
What are macros and do I need to track them?
Macros are protein, carbohydrates, and fat. You do not have to track them, but hitting your protein target makes weight loss easier and helps preserve muscle.
How much protein should I eat?
A common guideline is roughly 1.6 to 2.2 grams per kilogram of body weight when you are losing weight or building muscle. The calculator’s protein figure is a solid starting point.
Why am I not losing weight in a calorie deficit?
Usually the deficit is smaller than it seems, often from untracked extras, or weight is masked by water and food in your system. Track carefully for two weeks and watch the longer-term trend.
Should women and men use different calorie targets?
Yes, and the calculator handles it automatically because sex is one of the inputs. On average women need somewhat fewer calories than men of the same size.
Do I need to eat back the calories I burn exercising?
Generally no. Your activity level already builds in typical workouts, so eating them back again can quietly erase your deficit.
References
Calorie needs use the Mifflin-St Jeor equation (Mifflin MD, St Jeor ST, et al., The American Journal of Clinical Nutrition, 1990) with standard activity multipliers. For dietary guidance, see the U.S. Dietary Guidelines and the CDC on healthy weight.
What should I do next?
You have your calorie target. Here is where to go next.
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New here? Start on our Start Here page or read the complete beginner guide.