BMR Calculator
Estimate your Basal Metabolic Rate (BMR) using the Mifflin–St Jeor formula. Informational only, not medical advice.
Informational only. Estimates vary by body composition, sleep, hormones, and health conditions.
Privacy: calculations run locally in your browser. No inputs are stored or sent to a server.
How it works
This calculator uses the Mifflin–St Jeor equation (metric units). If you enter imperial values, they are converted to cm and kg first.
Male: BMR = 10×kg + 6.25×cm − 5×age + 5
Female: BMR = 10×kg + 6.25×cm − 5×age − 161
Examples
- Male, 30y, 175 cm, 70 kg → BMR ≈ 1,649 kcal/day
- Female, 30y, 165 cm, 60 kg → BMR ≈ 1,320 kcal/day
- Imperial example: 5 ft 9 in, 154 lb → converts to metric then computes
When to use this tool
This tool is designed for quick, practical tasks such as everyday calculations, data formatting, or simple conversions. It is best used when you need fast results without installing software or using complex tools.
When to use
- Quick checks or one-time calculations
- Validating or converting data before using it elsewhere
- Simple tasks that do not require advanced software
When not to use
- Critical financial, legal, or medical decisions
- Large-scale or automated processing
- Situations requiring guaranteed precision beyond basic validation
Always review results before using them in important contexts.
About this tool
This tool helps you perform quick utility operations directly in your browser. It runs entirely in your browser without sending data to a server.
You can use this tool when handling simple tasks without installing additional software. The results should be interpreted as a processed output based on your input data.
FAQ
- What is BMR?
BMR (Basal Metabolic Rate) estimates how many calories your body burns per day at rest to support basic functions.
- Is this the same as TDEE?
No. TDEE includes activity. BMR is a baseline at rest.
- Which formula does this use?
It uses the Mifflin–St Jeor equation with metric inputs (kg, cm), converting from imperial if needed.
- Is the result exact?
No. It is an estimate. Real metabolism varies with body composition, sleep, hormones, and health conditions.
- Is my data stored?
No. All calculations run locally in your browser.