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Health & fitness calculatorsFreeFast
BMR Calculator
Your Basal Metabolic Rate — the calories you burn at complete rest — from age, sex, height and weight, using the Mifflin-St Jeor equation. Instant, in your browser.
- instantaverage
- In-browserprocessing
- Zerouploads
- Runs in your browser
- Nothing is uploaded
- No signup required
Kalyvor
BMR Calculator
Health & fitness calculators
BMR Calculator
Inputs
Units
Age
Sex
Height (cm)
Weight (kg)
Your result appears here.
Ready to generate
Choose your options and press Calculate.
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Why Kalyvor
Built for people who value their time
Every health & fitness tool is fast, private and genuinely free — no dark patterns, no surprises.
Fast cloud processing
Jobs run on dedicated workers and finish in seconds — no queue, no spinner you can go make coffee to.
Auto file deletion
Everything you upload is erased the moment the job finishes. Nothing is written to long-term storage, so there is no retention period to wait out.
Works everywhere
Desktop, tablet or phone, any modern browser. Nothing to install, no plugins, no extensions.
Batch processing
Drop in a folder's worth of files and run the whole set through one tool in a single pass.
Privacy first
Encrypted in transit, never used to train models, never sold. Many tools never send the file at all.
No installation
Open a tab and go. No account needed to start, no download, no licence key to hunt for.
How it works
BMR Calculator in three steps
No account, no installation, no manual. It takes about as long to do as it does to read.
- 01
Choose your units
Metric (cm, kg) or US (ft/in, lbs) — switch any time without losing what you typed.
- 02
Enter your age, sex, height and weight
Sex matters here — the Mifflin-St Jeor equation uses a different offset for each.
- 03
Read your estimated BMR
Calories burned at complete rest — updated instantly.
Questions
Frequently asked questions
Everything worth knowing before you run your first BMR Calculator job. Still stuck? Talk to support.
Helpful articles
Guides and walkthroughs for getting more out of BMR Calculator.
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