Calorie Calculator
Calculate goal-based daily intake
Calorie Calculator tool
Calorie Calculator
Calorie Calculator: key facts
- What it does
- Calculate goal-based daily intake
- Category
- Health & Fitness Calculators
- Cost
- Free, with no account, sign-up, or install.
- Your data
- Runs entirely in your browser — the files and text you enter are never uploaded to a server.
- Last reviewed
- . Report an incorrect result.
What this tool is for
Whether you want to lose, maintain, or gain weight, it all comes down to one number: how many calories to eat each day. This calculator takes your total daily energy expenditure and adjusts it for your goal, giving you a clear daily intake target to aim for.
It works as the final step after you know what your body burns. Someone aiming to lose weight gets a target set below their burn rate; someone building muscle gets one above it; someone holding steady gets their maintenance figure. Pairing it with a TDEE estimate turns "eat less" or "eat more" into an actual number you can plan meals around.
How to use the Calorie Calculator
- Enter your daily TDEE in calories (find it with a TDEE calculator if you don't know it).
- Choose your goal: lose weight, maintain, or gain weight.
- Read your target daily calorie intake.
- Plan your meals around that figure, and recalculate as your weight or activity changes.
The 500-calorie adjustment, and where it comes from
The tool takes your maintenance figure and applies a fixed 500-calorie adjustment in either direction: subtract for loss, leave unchanged for maintenance, add for gain. The number is not arbitrary. A pound of body fat stores roughly 3,500 calories, so a 500-calorie daily deficit works out at about a pound a week — the origin of a rule of thumb that has been in circulation for decades.
Half a kilogram to a kilogram a week is the range generally regarded as sustainable, and 500 calories sits comfortably inside it for most adults. Larger deficits accelerate loss initially but increase the share coming from muscle rather than fat, and adherence tends to fall away as the deficit grows.
For gaining, the same 500 in the other direction is deliberately modest. A surplus much larger than this adds fat faster than the body can build muscle, since muscle accrual is limited by training stimulus and protein synthesis rather than by available calories.
- On a 2,000 calorie maintenance figure the three targets are 1,500, 2,000, and 2,500.
- The 1,500 option is a 25% deficit at that maintenance level — but the same 500 against a 3,200 maintenance is only 16%, which is why percentage matters more than the absolute number.
- Sustained perfectly, a 500-calorie deficit predicts roughly 26 lb over six months. Real results are almost always less, for the reasons below.
What the Calorie Calculator gets right
- It applies a moderate, sustainable adjustment — a 500-calorie deficit for loss or surplus for gain — rather than an aggressive swing that is hard to maintain.
- By taking TDEE as input, it stays accurate for anyone, since your burn rate already reflects your size and activity.
- The output is a single, actionable number you can build a meal plan or food log around.
- It calculates instantly in your browser with no account.
Why the arithmetic overpredicts
The 3,500-calorie rule assumes your maintenance figure stays put, and it does not. As weight falls there is less body to maintain and less energy spent moving it, so maintenance drifts downward and the original deficit shrinks with it. Spontaneous movement also tends to decrease during a deficit without any conscious choice. Together these effects mean weight loss decelerates and plateaus, which linear arithmetic cannot show.
Two practical points. A 500-calorie deficit is a large proportion of a small maintenance figure, so smaller and older people should consider a smaller absolute deficit — 20% of maintenance is a more sensible frame than a flat number. And very low intakes, generally under about 1,200 calories for women or 1,500 for men, make adequate nutrition difficult and belong under supervision.
Calorie targets are also only useful to the extent intake is tracked accurately, and self-reported intake is routinely underestimated by a wide margin. Recalculate as your weight changes, adjust from what actually happens over a few weeks, and involve a doctor or dietitian for substantial weight change, for any eating disorder history, or if you are pregnant, breastfeeding, or managing a chronic condition.
Frequently Asked Questions
How big a calorie deficit should I aim for?
A deficit of around 500 calories a day — what this calculator applies for weight loss — targets roughly half a kilogram (about a pound) of fat loss per week, a pace most people can sustain. Larger deficits speed results but are harder to maintain and can cost muscle.
Why does this need my TDEE instead of my height and weight?
It focuses on the goal-adjustment step and expects your total daily energy expenditure as input. Calculate your TDEE first — from your BMR and activity level — then enter it here to get a goal-specific target.
Will eating at this target guarantee weight change?
Calorie targets are estimates, and real results depend on accurate tracking, consistency, and individual metabolism. Use the figure as a starting point, monitor your weight over a few weeks, and adjust if progress stalls or moves too fast.
Should I eat the same calories every day?
A consistent daily target is simplest, but some people prefer to vary intake across the week while keeping the weekly total the same. Either approach works as long as your average lands near the target this calculator gives you.
