DIY Cost Tools
TDEE Calculator
HEALTH CALCULATOR
Estimate basal metabolic rate and total daily energy expenditure using the Mifflin–St Jeor equation and an activity multiplier.
Estimated BMR1,699 kcal/day
Estimated TDEE2,633 kcal/day
Illustrative loss target2,133 kcal/day
Illustrative gain target2,933 kcal/day
How it works
BMR estimates energy used at rest. TDEE multiplies BMR by the selected activity factor.
Formula
Mifflin–St Jeor: BMR = 10W + 6.25H − 5A + sex constant
TDEE = BMR × activity factor
Important limits
- This is an estimate, not a diagnosis or individualized nutrition plan.
- Pregnancy, growth, illness, medications, body composition, and metabolic conditions can materially change needs.
- A clinician or registered dietitian can help set a safe target, especially for minors or medical conditions.
Frequently asked questions
What is the activity multiplier?
It is a broad estimate of daily movement and exercise relative to resting needs.
Why can real maintenance calories differ?
Equations estimate population averages; tracking weight and intake over time provides personal feedback.
Review notes
The tool identifies its equation and keeps calorie changes illustrative rather than prescriptive. Last reviewed September 30, 2026.