Calorie Calculator
Calculate your daily calorie needs based on age, weight, height, and activity level. Get personalized nutrition recommendations.
Illustrative energy estimates
For adults only; unsuitable for pregnancy or breastfeeding. These equations, activity factors, ±500 kcal comparisons and macro split are estimates, not validated individual targets or a weight-change guarantee. NIDDK explains the scope of its own planner; it does not validate this equation.
Switching units converts valid measurements; empty or invalid drafts remain editable.
Calorie Goals
The ±500 kcal figures compare arithmetic scenarios; they are not recommended intakes.
Macros Breakdown
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Method and limits
Resting energy is estimated with the equations shown below. Weight is in kg, height in cm, age in years; output is kcal/day.
Daily energy = unrounded resting estimate × selected factor (1.2, 1.375, 1.55, 1.725 or 1.9). Macros are illustrative: 30% protein and 45% carbohydrate at 4 kcal/g, 25% fat at 9 kcal/g.
a = Age. ♂: 88.362 + 13.397 × kg + 4.799 × cm − 5.677 × a; ♀: 447.593 + 9.247 × kg + 3.098 × cm − 4.330 × a.
Full numerical precision is retained until display. Unit conversions use 1 in = 2.54 cm and 1 lb = 0.45359237 kg.
This calculator does not save the measurements you enter. Other page and site services have their own data handling.
About Calorie Calculator
Calculate daily calorie needs based on your activity level and goals. Find maintenance, weight loss, or gain calories. Includes macronutrient breakdown.
Illustrative energy estimates For adults only; unsuitable for pregnancy or breastfeeding. These equations, activity factors, ±500 kcal comparisons and macro split are estimates, not validated individual targets or a weight-change guarantee. NIDDK explains the scope of its own planner; it does not validate this equation. This calculator does not save the measurements you enter. Other page and site services have their own data handling.
♂: 88.362 + 13.397 × kg + 4.799 × cm − 5.677 × age; ♀: 447.593 + 9.247 × kg + 3.098 × cm − 4.330 × age.
For adults only; unsuitable for pregnancy or breastfeeding. These equations, activity factors, ±500 kcal comparisons and macro split are estimates, not validated individual targets or a weight-change guarantee. NIDDK explains the scope of its own planner; it does not validate this equation.
Use Cases
How to use
Enter age, gender, height, weight
Select your activity level
Choose your goal (maintain, lose, gain)
View daily calorie target
Choose units, enter measurements and review the method and limits with the result.
Pro Tips
- A deficit of 500 cal/day = ~1 lb/week loss
- Activity level greatly affects needs
- Recalculate as your weight changes
- Switching units converts valid measurements; empty or invalid drafts remain editable.
Frequently Asked Questions
It estimates using formulas like Mifflin-St Jeor. Individual needs vary. Resting energy is estimated with the equations shown below. Weight is in kg, height in cm, age in years; output is kcal/day. The ±500 kcal figures compare arithmetic scenarios; they are not recommended intakes. For adults only; unsuitable for pregnancy or breastfeeding. These equations, activity factors, ±500 kcal comparisons and macro split are estimates, not validated individual targets or a weight-change guarantee. NIDDK explains the scope of its own planner; it does not validate this equation.
Total Daily Energy Expenditure - calories you burn in a day including activity. Resting energy is estimated with the equations shown below. Weight is in kg, height in cm, age in years; output is kcal/day. The ±500 kcal figures compare arithmetic scenarios; they are not recommended intakes. For adults only; unsuitable for pregnancy or breastfeeding. These equations, activity factors, ±500 kcal comparisons and macro split are estimates, not validated individual targets or a weight-change guarantee. NIDDK explains the scope of its own planner; it does not validate this equation.
Depends on goals. Generally, eating half back is a safe approach. Resting energy is estimated with the equations shown below. Weight is in kg, height in cm, age in years; output is kcal/day. The ±500 kcal figures compare arithmetic scenarios; they are not recommended intakes. For adults only; unsuitable for pregnancy or breastfeeding. These equations, activity factors, ±500 kcal comparisons and macro split are estimates, not validated individual targets or a weight-change guarantee. NIDDK explains the scope of its own planner; it does not validate this equation.
They show the stated arithmetic assumptions, not an individual diagnosis or a measured energy requirement.
Valid height and weight are converted; empty or invalid drafts remain editable. Equivalent measurements give the same estimate before display rounding.