Compare calculators
Both calculators run independently — change the inputs on either side to compare results.
Fitness
BMR & TDEE Calculator
Calculate your Basal Metabolic Rate (BMR) and Total Daily Energy Expenditure (TDEE) using the Mifflin-St Jeor equation. Use it to set accurate calorie targets for fat loss, maintenance, or muscle gain.
Fill in the required fields to see your result.
Fitness
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.
Fill in the required fields to see your result.
Key differences
| BMR & TDEE Calculator | One Rep Max Calculator | |
|---|---|---|
| Category | Fitness | Fitness |
| Inputs required | 5 | 4 |
| Result | Total Daily Energy Expenditure (calories/day) | Estimated 1RM (kg) |
| What it does | Calculate your Basal Metabolic Rate (BMR) and Total Daily Energy Expenditure (TDEE) using the Mifflin-St Jeor equation. Use it to set accurate calorie targets for fat loss, maintenance, or muscle gain. | 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. |