About IronMath Fitness
Free tools for better planned lifting.
Estimate your max, plan training loads, and work out your plates. Every tool runs in your browser, with no account required.
Strength estimates use the Epley and Brzycki formulas. Each calculator includes a worked example and an explanation.
Available calculators
- One-Rep Max Calculator — Estimate your one-rep max from a recent set.
- Plate Calculator — Find the plates to load on each side.
- Percentage of 1RM Table — Turn your one-rep max into loadable training weights.
- Warm-Up Set Generator — Build a warm-up ramp for your working weight.
- lb to kg Converter — Convert lb and kg, with common barbell weights for reference.
Disclaimer
Results from these calculators are estimates and are not medical or training advice. Always consult a qualified coach or physician before starting or modifying any training program.