Convert running pace between min/km and min/mi, calculate splits for any distance, and predict your race times across 5K, 10K, half and full marathon (Riegel formula).
| Race | Distance | Predicted time |
|---|
| Split | Cumulative time |
|---|
Race predictions use Riegel's formula: T₂ = T₁ × (D₂ / D₁)^1.06. Accurate within ±5% for well-trained runners over similar distances.
1 mile = 1.609344 km. Pace = time / distance; speed = distance / time.
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.
Cycling Power to Speed Calculator
Estimate cycling speed from watts using bike weight, gradient, wind and surface drag.
