Free workout tools
Do the training math. Keep the context.
Fast calculators for lifting, running, cardio, and weekly planning—each with the formula and limitations in plain language.
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Free strength calculator
One-rep max calculator
Estimate your one-rep max from weight and reps using Epley and Brzycki formulas, then see practical training percentages.
March 26, 2026 · Interactive · Free
Free lifting calculator
Barbell plate calculator
Enter a target barbell weight and see which standard plates to load on each side for common pound or kilogram bars, including any remainder.
March 19, 2026 · Interactive · Free
Free training calculator
Workout volume calculator
Calculate lifting volume load, total reps, and weekly tonnage from sets, reps, weight, and training frequency.
March 12, 2026 · Interactive · Free
Free effort calculator
RPE and RIR calculator
Convert lifting RPE to reps in reserve, then estimate a rough one-rep max from load, completed reps, and the reps you had left.
March 5, 2026 · Interactive · Free
Free running calculator
Running pace calculator
Calculate running pace per mile and kilometer, speed, finish time, and common split times from distance and duration.
February 26, 2026 · Interactive · Free
Free cardio calculator
Heart-rate zone calculator
Estimate five training zones using heart-rate reserve, resting heart rate, and measured or age-predicted maximum heart rate.
February 19, 2026 · Interactive · Free
Free activity calculator
Calories burned calculator
Estimate exercise calories from activity MET value, body weight, and duration with transparent assumptions.
February 12, 2026 · Interactive · Free
Free schedule builder
Weekly workout frequency planner
Create a simple weekly training structure from available days and your strength, endurance, sport, and recovery priorities.
February 5, 2026 · Interactive · Free