Sports Tools
One Rep Max Calculator - Estimate Your 1RM
Estimate your one rep max from weight and reps. Calculate 1RM using popular strength formulas and view estimated weights for different rep ranges.
Sports Tools
One Rep Max Calculator
Estimate your one rep max from the weight you lifted and the number of reps completed. Useful for strength training, powerlifting, and workout planning.
Estimated 1RM
Average estimate
Based on 100 kg × 5 reps
Epley formula
116.7 kg
Brzycki formula
112.5 kg
Estimated weight by reps
1 rep
110.9 kg
2 reps
107.4 kg
3 reps
104.2 kg
4 reps
101.1 kg
5 reps
98.2 kg
6 reps
95.5 kg
8 reps
90.5 kg
10 reps
85.9 kg
12 reps
81.8 kg
Best for 1 to 12 reps. Higher reps are less accurate.
Quick examples
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How this one rep max calculator works
Enter the weight you lifted.
Choose kg or lb.
Enter the number of reps completed.
View your estimated one rep max and rep range estimates.
Frequently Asked Questions
What is a one rep max?
A one rep max is the maximum weight you can lift for one complete repetition with proper form.
Is the result exact?
No. One rep max formulas are estimates. Actual strength can vary based on form, fatigue, and exercise type.
Which exercises can I use this for?
You can use it for common strength movements such as bench press, squat, deadlift, and overhead press.
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