1RM Calculator & Plate Math
GymCalc
Keep the math instant so you can stay focused on the bar. Estimate 1RM, plan warm-ups, and load plates — in a dark, chalk-and-steel interface.
3
1RM formulas
0
accounts needed
100%
on-device data
What it does
Every number you need, mid-workout
1RM, three ways
Enter weight and reps, and compare Epley, Brzycki, and Lombardi estimates side by side — plus full rep-max tables.
kg ↔ lbs, live
Type in either field and the other updates instantly. No buttons, no waiting — just conversion at the speed of thought.
Percentages, tap to load
Training percentages from 50–95% of your working weight, rounded to real plates (0.5 kg / 2.5 lbs) so the math is actually loadable.
Visual plate math
The plate calculator draws the loaded bar in standard gym plate colors — glance once, grab the right plates, lift.
Warm-up planner
Enter your target working weight and get progressive warm-up sets that lead you there, properly prepared.
Your bar, remembered
Customizable bar weight and saved preferences. Everything stays on your device — no accounts, no sync, no noise.
Zero tracking. Zero accounts. Just math.
Your bar weight and unit preferences stay on your iPhone. No analytics, no ads, no servers — nothing to sign up for.
Read the privacy policyInside the app
Dark, focused, gym-bright
Chalk up. Load right.
Download GymCalc and never fumble plate math between sets again.
Download on the App Store