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Both calculators run independently — change the inputs on either side to compare results.

One Rep Max Calculator

Predict your one-rep max (1RM) — the heaviest weight you could lift for a single perfect rep — from a recent set you actually performed. Used by powerlifters, strength coaches, and bodybuilders to prescribe percentage-based training (e.g., "work up to 5×5 at 80% of 1RM") without the risk and recovery cost of repeatedly testing true maxes.

Weight Lifted (kg)

Reps Performed (reps)

Calculation Formula

Training Experience

Fill in the required fields to see your result.

Fitness

TDEE Calculator

Calculate Total Daily Energy Expenditure (TDEE) by computing BMR via Harris-Benedict equation, then multiplying by an activity factor. Use it as the foundation for evidence-based weight management, sports nutrition, and meal planning.

Body Weight (kg)

Height (cm)

Age (years)

Gender

Activity Level

Fill in the required fields to see your result.

Key differences

	One Rep Max Calculator	TDEE Calculator
Category	Fitness	Fitness
Inputs required	4	5
Result	Estimated 1RM (kg)	Total Daily Energy Expenditure (calories)
What it does	Predict your one-rep max (1RM) — the heaviest weight you could lift for a single perfect rep — from a recent set you actually performed. Used by powerlifters, strength coaches, and bodybuilders to prescribe percentage-based training (e.g., "work up to 5×5 at 80% of 1RM") without the risk and recovery cost of repeatedly testing true maxes.	Calculate Total Daily Energy Expenditure (TDEE) by computing BMR via Harris-Benedict equation, then multiplying by an activity factor. Use it as the foundation for evidence-based weight management, sports nutrition, and meal planning.