BMR Calculator
Basal metabolic rate at rest.
BMR
1,649
calories per day at rest
Estimated TDEE
Introduction
Your basal metabolic rate is what your body burns just to keep you alive — heartbeat, breathing, brain. Move at all and you burn more; that’s TDEE.
What is BMR Calculator?
Basal metabolic rate is an estimate of resting energy use. It is a starting point for planning, not a personalised calorie prescription or a measurement of actual daily expenditure.
Definition: BMR Calculator estimates the energy your body uses at rest from your age, sex, height, and weight.
Formula
BMR (Mifflin-St Jeor) = 10 × weight(kg) + 6.25 × height(cm) − 5 × age + s
Calculation steps
Formula. Mifflin-St Jeor (1990): 10·kg + 6.25·cm − 5·age + s, where s is +5 for men and −161 for women.
Why this one? Mifflin-St Jeor is the most accurate general-population estimate in peer-reviewed comparisons of the Harris-Benedict, Katch-McArdle and Cunningham equations.
Worked example
Example: Using the BMR Calculator
Inputs: Enter values relevant to calories & nutrition — for example, the measurements or amounts described in the tool fields above.
- Open the BMR Calculator and review the input fields.
- Apply the formula: BMR (Mifflin-St Jeor) = 10 × weight(kg) + 6.25 × height(cm) − 5 × age + s
- Adjust inputs to compare scenarios side by side.
You receive an immediate basal metabolic rate at rest — useful for planning and comparison.
Use cases
- Working through a calories & nutrition question with clear inputs
- Comparing inputs in the BMR Calculator
- Using a focused tool instead of a general spreadsheet or manual calculation
Advantages
- Browser-based processing — entered values and selected files are not sent to our servers
- No account required
- Instant results with a clean, readable interface
- Transparent formula shown on this page
Limitations
- BMR does not include activity, exercise, digestion, illness, or day-to-day variation.
- Formula estimates can differ from measured metabolic rate.
- Use nutrition or weight-change decisions with appropriate clinical guidance when needed.
Frequently asked questions
- Is the BMR Calculator free to use?
- Yes. BMR Calculator on The Daily Tools is completely free, requires no account, and runs entirely in your browser.
- Does The Daily Tools store my inputs?
- No. Your numbers and text never leave your device. The Daily Tools has no backend database for calculator inputs.
- Who should use the BMR Calculator?
- Anyone who needs a clear health and fitness calculation and wants to check the assumptions used.
- How accurate is the BMR Calculator?
- Results follow the standard formula shown on this page. They are estimates for planning — not a substitute for professional medical advice.
- Can I use the BMR Calculator on mobile?
- Yes. The Daily Tools is fully responsive and works on phones, tablets, and desktops.
Sources & references
- Mifflin-St Jeor equation — Resting metabolic rate estimate used by this tool
- The Daily Tools Methodology
Key points
- BMR Calculator is a free, browser-based calculator for basal metabolic rate at rest.
- Formula: BMR (Mifflin-St Jeor) = 10 × weight(kg) + 6.25 × height(cm) − 5 × age + s
- Private, browser-only processing
- Private, browser-based processing