About Easy TDEE

Why we built this

Most fitness calculators online do not show you their formulas, cite their sources, or explain their assumptions. We built Easy TDEE to change that.

Every calculator on this site shows the formula it uses, cites the original research, and explains the limitations. If you get a result you're unsure about, you can verify the maths yourself.

Formulas and sources

TDEE and BMR: Mifflin-St Jeor equation. St Jeor ST, et al. J Am Diet Assoc. 1990;90(10):1407–1413.

Activity multipliers: Katch-McArdle convention for adjusting BMR to total daily expenditure.

Macro ranges: Dietary Guidelines for Americans 2020–2025 (USDA / HHS).

Calorie deficit model: Wishnofsky M. Am J Clin Nutr. 1958 (3,500 cal ≈ 1 lb fat approximation).

BMI classification: World Health Organization (WHO) and US CDC Adult BMI categories.

Medical disclaimer

These tools are for informational purposes only. They are not a substitute for advice from a qualified healthcare provider, registered dietitian, or certified personal trainer. Consult a professional before making significant changes to your diet or exercise programme.