Calorie / BMR Calculator
Calculate your BMR (basal metabolic rate) and TDEE (total daily energy expenditure) using the Mifflin-St Jeor formula — most accurate per dietetic studies. Get calorie targets for losing, maintaining or gaining weight, plus macro split.
What powers the Calorie / BMR Calculator
Mifflin-St Jeor BMR formula (most accurate per ADA)
TDEE adjusted for 5 activity levels
5 weight-goal targets: lose 1 kg/wk to gain 1 kg/wk
Macro split at TDEE (30P / 45C / 25F)
Metric (kg/cm) OR imperial (lb/in) units
no data sent anywhere
Why the Calorie / BMR Calculator is different
Browser-native
The Calorie / BMR Calculator runs entirely in your browser. Input is processed locally — never uploaded, never logged, never cached anywhere outside your device.
No artificial limits
No daily quotas, no character ceilings, no "upgrade for more" walls. Every feature is the complete feature — the same on the first use as the thousandth.
Production-grade quality
Built to the same engineering bar as paid SaaS tools — accurate algorithms, audited logic, responsive design and accessibility-tested interactions.
Common use contexts
- Starting a weight-loss or muscle-gain plan
- Verifying your maintenance calorie target
- Calculating macro grams for diet planning
- Comparison check against a coach's recommendation
Private and secure
Zero upload
All processing happens in your browser. Input is never transmitted, logged or cached.
Works offline
Once the page loads, the tool runs without an internet connection. No network calls happen during use.
No tracking
No accounts, no cookies for tool state. Only aggregate analytics count visits at the page level.