Calorie & Macro Calculator
Estimate daily maintenance calories — general estimate, not medical advice.
How to Use the Calorie & Macro Calculator
- Input Biometrics: Enter age, gender, height, and current weight.
- Calculate: The tool applies the Mifflin-St Jeor BMR formula automatically.
- Get Estimate: View your estimated daily maintenance calories.
Why Use This Calculator
Estimating daily calorie needs based on age, gender, height, and weight online for free helps with general nutrition planning without needing a nutritionist consultation for a rough baseline. This calculator estimates your total daily energy expenditure using a well-established metabolic formula.
How It Works
This TDEE calculator applies the Mifflin-St Jeor equation to estimate your Basal Metabolic Rate from age, gender, height, and weight, then multiplies by an activity factor to estimate total daily maintenance calories. It's a free, lightweight browser alternative to MyFitnessPal's calorie estimator and TDEECalculator.net for a quick baseline number.
Key Features
The BMR-calorie-estimator applies gender-specific formula variants, since metabolic rate calculations differ slightly between men and women due to typical differences in body composition. As a daily-calorie-target tool, the estimate updates instantly once all fields are filled, giving an immediate maintenance calorie reference point. The Mifflin-St Jeor formula used here is widely regarded as one of the more accurate general-population BMR equations available. An activity level selector now scales the base BMR into a realistic daily TDEE, a goal selector (maintain, lose, or gain) adjusts the target calories accordingly, protein, carbohydrate, and fat targets break down the full macro plan, and metric or imperial units can be used throughout.
Common Use Cases
Anyone starting a fitness or nutrition tracking journey establishes a baseline maintenance calorie estimate. People trying to lose or gain weight use the maintenance number as a starting point for calculating a calorie deficit or surplus target. Fitness coaches reference the formula when explaining basic energy balance concepts to new clients, and students studying nutrition science see the Mifflin-St Jeor formula applied in practice. People planning meal prep for the week use the estimate to guide roughly how much food to prepare.
Tips for Best Results
This estimate assumes a moderate activity level baseline; your actual needs will vary based on how active you truly are day to day, so treat the number as a reasonable starting point rather than an exact figure. Combining this estimate with tracking your actual weight trend over several weeks gives a more personalized, accurate calorie target over time. Recalculating periodically as your weight changes keeps the maintenance estimate reasonably current rather than relying on an outdated number.
A Quick Note
General estimates like this work best as one input among several when thinking about health and fitness goals, alongside guidance from a doctor or nutritionist for anything more personalized.
Privacy & Security
Because ToolNest processes everything entirely within your browser using client-side JavaScript, your files never leave your device. There is no server-side storage, no third-party analytics attached to your data, and no risk of a breach exposing files you processed months ago.
What is Total Daily Energy Expenditure (TDEE) and how is it estimated?
TDEE is your estimated total daily calorie burn, calculated by taking your Basal Metabolic Rate and multiplying it by an activity level factor.
How are daily carbohydrate, protein, and fat targets general calculated?
Macro targets are typically calculated as a percentage split of total daily calories, though this tool focuses on the overall maintenance calorie estimate.
Does this calculator account for exercise activity level?
This estimate uses a general moderate activity multiplier; individual results vary based on your specific activity level.
Should I use this number as an exact calorie target?
Treat it as a reasonable starting estimate rather than a precise figure, and adjust based on how your actual weight trends over time.