Force et fitness
1RM, plate loading, macros and training-zone calculators for lifters and runners.
One Rep Max (1RM) Calculator + % Chart
Estimate your 1RM with 5 formulas (Epley, Brzycki, Lombardi, O'Conner, Wathan) and a full %1RM training chart.
Barbell Plate Loading Calculator (kg / lb)
Plate math for any target weight, with available plate inventory, in kg or lb — for Olympic, women's and trap bars.
Wilks, DOTS & IPF GL Powerlifting Score Calculator
Compare powerlifting totals across weight classes with Wilks, DOTS and IPF GL coefficients.
Macros from Calories Calculator (P / F / C in g)
Calculate grams of protein, fat and carbs from any calorie target with keto, balanced and high-protein presets.
Heart Rate, FTP & Pace Training Zone Calculator
Generate Z1–Z5 training zones from threshold heart rate, FTP or threshold pace for running, cycling and rowing.
Running Pace Converter & Race Time Predictor
Convert running pace between min/km and min/mi and predict your 5K, 10K, half and full marathon times.
Cycling Power to Speed Calculator
Estimate cycling speed from watts using bike weight, gradient, wind and surface drag.