Real formulas, free to use.
The same equations LevelMaxing runs inside the app: one-rep max, BMR, TDEE and macros, and the XP curve. No account needed.
Calculated in your browser — nothing you enter is sent anywhere.
Strength
One-rep max
Enter a set you have actually lifted. The estimate uses the formula best suited to your rep range, and every other formula is listed for comparison.
Estimated one-rep max
112.5kg
Brzycki formula
Confidence
highBrzycki for 2–6 reps, Epley for 7–10, Lander for 11–15, O'Conner beyond.
Every formula
- Epley116.7 kg
- Brzyckiused112.5 kg
- Lander113.7 kg
- Lombardi117.5 kg
- O'Conner112.5 kg
- Mayhew119 kg
- Wathen116.6 kg
Training loads
Percentages of your estimated 1RM.
- 50%56.3kg
- 55%61.9kg
- 60%67.5kg
- 65%73.1kg
- 70%78.8kg
- 75%84.4kg
- 80%90kg
- 85%95.6kg
- 90%101.3kg
- 95%106.9kg
Nutrition
BMR, TDEE & macros
Basal metabolic rate from the Mifflin-St Jeor equation, total daily energy expenditure from your activity level, and macro targets tuned to your goal.
BMR
1,379kcal
Harris-Benedict: 1,430 kcal
TDEE
2,137kcal
BMR × 1.55
Daily target
2,137kcal
Goal: maintain
- Protein128 g24%
- Carbohydrates274 g51%
- Fat59 g25%
- 2 g protein per kg · fat 25% of calories · carbohydrates fill the rest
Estimates for healthy adults, not medical advice. If you are pregnant, managing a health condition or under 18, check with a professional.
Progression
XP & level
See the level and rank a given XP total earns, or how much XP a target level needs. Level L starts at 50 × L × (L − 1) total XP.
Level
16
12,500 total XP
Rank
Silver17,500 XP to Gold at level 25
1,100 XP to go.
In the app
Let the numbers update themselves.
Inside LevelMaxing every logged set refreshes your 1RM estimates, XP and muscle levels automatically — no calculator required.