Free Fitness Calculators
Free to use, no registration required. Each calculator explains its formula, assumptions and limits. They give estimates and general guidance, not personalised coaching or medical advice.
One Rep Max Calculator
Estimate your 1RM from any weight and rep count, plus a training percentages table.
Plate Calculator
Work out exactly which plates to load per side for any target weight.
Deload Calculator
Plan a lighter week: reduce load, volume or both, with rounded numbers for your lifts.
Protein Calculator
Estimate a daily protein target from your bodyweight and activity level.
WOD Generator
Generate a personalised CrossFit-style or HIIT workout based on your available equipment, fitness level and workout duration.