One Rep Max Calculator – 1RM & Training Table

One Rep Max Calculator – 1RM & Training Table

Estimate your one rep max (1RM) from any submaximal lift: enter the weight you lifted and how many reps you completed, and this one rep max calculator shows your estimated max plus a full training-percentage table for programming your next workout.

Weight lifted Unit Kilograms (kg) Pounds (lb) Reps completed (1–12)

This one rep max calculator runs entirely in your browser. Estimates only — always lift with good form and a spotter.

Popular one rep max examples

• 100 kg for 5 reps → about 116–117 kg estimated 1RM
• 80 kg for 8 reps → about 101–103 kg estimated 1RM
• 60 kg for 10 reps → about 80 kg estimated 1RM

Use the table above to pick working weights: strength work usually sits at 80–90% of 1RM, hypertrophy at 65–80%, and endurance above 12 reps at under 65%.