How is athlete TDEE calculated from body fat and lean mass?
Lean mass = weight × (1 − body-fat fraction). Cunningham RMR = 500 + 22 × lean mass in kg. TDEE = RMR × activity factor.
Health & fitness
TDEE calculator for athletes
Estimate athlete TDEE from body weight, body-fat percentage, lean mass, and training activity.
- Metric and imperial units
- Instant updates as inputs change
- Data is calculated in this browser only
Results update as you type
TDEE2800 kcal/day
- Estimated resting expenditure
- 1806 kcal/day
- Lean body mass
- 130.9 lb
- Activity multiplier
- 1.550
TDEE is a starting estimate. Track intake and body-weight trends for 2–4 weeks, then adjust from observed results.
Calculation notes
Understand the TDEE calculator for athletes
Uses lean body mass in the Cunningham resting-energy estimate, then applies an activity multiplier to estimate TDEE. Activity multipliers add substantial individual uncertainty.
What is TDEE at 70 kg and 15% body fat?
At 70 kg and 15% body fat, lean mass is 59.5 kg and estimated RMR is 1,809 kcal/day. At a 1.55 activity factor, TDEE is about 2,804 kcal/day.
How should an athlete use a TDEE estimate for calories?
- Treat TDEE as a starting intake estimate.
- Compare predicted intake with two to four weeks of body-weight and training trends.
How accurate are body-fat-based TDEE activity factors?
- Body-fat measurement error carries directly into the estimate.
- Activity factors cannot capture every training block, job, or recovery difference.
Content and calculation reviewed: