Mondo Knows Tools
One Rep Max Calculator
Estimate your 1RM from a set you have already done. Use the free one rep max calculator below to get an instant answer, with the formula shown so you can check the maths and trust the result. Free, private, and no sign-up.
lb
reps
Mondo says
Estimated 1RM
216 lb
Brzycki formula208 lb
90% of max194 lb
80% of max173 lb
Training loads:
100% = 216 lb (~1 reps)
95% = 205 lb (~2 reps)
90% = 194 lb (~3 reps)
85% = 183 lb (~5 reps)
80% = 173 lb (~8 reps)
75% = 162 lb (~10 reps)
70% = 151 lb (~13 reps)
65% = 140 lb (~16 reps)
60% = 130 lb (~20 reps)
The formula
Epley: 1RM = weight x (1 + reps / 30)One Rep Max Calculator: common questions
- What does the One Rep Max Calculator work out?
- Estimate your 1RM from a set you have already done. It is one of the Health & Fitness tools on Mondo Knows.
- How is the One Rep Max Calculator calculated?
- The maths is short enough to check by hand: Epley: 1RM = weight x (1 + reps / 30).
- Do I need to sign up, and is my data stored?
- No sign-up, and nothing you type is sent anywhere. The calculation runs in your own browser, so the figures stay on your device and the page works offline once loaded.
Mondo also knows
Calories Burned CalculatorEnergy burned in an activity, using MET values.🌿 Health & FitnessOvulation CalculatorOvulation day and the fertile window.🌿 Health & FitnessPace CalculatorPace, speed and finish time for a run or ride.🌿 Health & FitnessPeriod CalculatorYour next few period start dates.🌿 Health & Fitness
Estimates for general guidance only. This is not financial, medical or legal advice. Everything runs in your browser and nothing you type is stored.