Calorie Calculator - BMR & TDEE with Mifflin-St Jeor Formula

Calculate BMR, TDEE, and daily calorie targets for weight maintenance, loss, or gain

🔒 100% in-browser🆓 Free forever⚡ No sign-up
BMR (calories/day at rest)
1,669
TDEE (maintenance calories/day)
2,587
Mild loss (−250)
2,337
Loss (−500)
2,087
Mild gain (+250)
2,837
Gain (+500)
3,087
Uses the Mifflin-St Jeor equation. Estimates only - actual needs vary with body composition, genetics, and medical conditions. Do not use as a substitute for professional dietary advice.
Estimates only. Results are generated by generalised formulas from the inputs you provide and are for informational purposes only. They are not financial, tax, legal, medical, or professional advice, and do not account for your individual circumstances, jurisdiction, taxes, fees, or health conditions. Verify important figures with a qualified professional. By using this tool you agree to our Terms & Disclaimer.

How it works

  1. 1
    Enter your details

    Age, sex, height, and weight - metric or imperial.

  2. 2
    Pick activity level

    From sedentary to extra-active. This scales your BMR to your true daily burn (TDEE).

  3. 3
    Read your targets

    See BMR, maintenance calories (TDEE), and adjusted targets for mild/moderate weight loss or gain.

About Calorie Calculator - BMR & TDEE with Mifflin-St Jeor Formula

Free calorie calculator using the Mifflin-St Jeor equation - the most accurate BMR formula for the general population. Enter your age, sex, height, weight, and activity level to see your Basal Metabolic Rate (BMR), Total Daily Energy Expenditure (TDEE), and recommended daily calories for weight loss, maintenance, or gain. Runs entirely in your browser. Calorie Calculator - BMR & TDEE with Mifflin-St Jeor Formula on 712 Tools runs entirely inside your browser using modern JavaScript APIs - no server ever sees your data. That means instant results, complete privacy, and no upload limits.

Whether you need to calculate bmr, tdee, and daily calorie targets for weight maintenance, loss, or gain for a debugging session, a quick sanity check, or a production incident, this tool is free to use as many times as you need. There are no watermarks, no sign-up, and no ads inside the tool itself.

Frequently asked questions

What is BMR?

Basal Metabolic Rate - the calories your body needs at complete rest to keep vital functions running (breathing, circulation, cell production).

What is TDEE?

Total Daily Energy Expenditure - BMR multiplied by an activity factor, representing all calories you burn in a typical day.

How accurate is this?

Mifflin-St Jeor is accurate to within ±10% for most healthy adults, but individual metabolism varies. Do not use as a substitute for professional dietary advice.

Is my data uploaded?

No. All calculations run entirely in your browser.

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