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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.