Calculate your pace and plan your splits: Based on your target time or desired pace, our calculator generates a kilometer chart for 5 km, 10 km, the half marathon, and the marathon.
25 May 2026
Predict your race time: The Riegel Calculator projects your result across all distances from 5 km to a marathon—using an exponent that matches your training volume.
15 May 2026
Calculate FTP: From a 20-minute test, ramp test, 8-minute test, or hourly power output to threshold power, watts per kilogram, and the seven training zones.
27 April 2026
Convert a 500-meter split to watts and back: Rowing calculator featuring watts per kilogram, energy expenditure, weight-adjusted 2,000-meter time, and extrapolation to all distances.
15 April 2026
Calculate 1RM from a standard work set: a comparison of six formulas, from Epley to Mayhew, plus a ready-made percentage table with training weights.
20 March 2026
Calculate Wilks, Wilks 2, and IPF-GL points based on total score, body weight, and gender—using the official coefficients from the world governing body and links to the rankings.
9 March 2026
Convert RPE to a percentage of 1RM—and vice versa. Determine the working weight for a planned RPE; estimate the maximum from a working set, including an RIR table.
23 February 2026
Calculate the glycemic load of an entire meal based on the glycemic index and serving size—including a breakdown by serving and daily limits based on calorie count.
16 February 2026
Calculate calories and grams of alcohol for an entire evening—broken down by alcohol and sugar, extrapolated to a week and a year, using a standard glass and a risk classification.
9 February 2026
Compare your daily HRV value to your own baseline: normal range based on seven measurements, standard deviation, and weekly trend based on the smallest significant change.
19 January 2026
Calculate the weekly training load using the Session RPE method: load per session, weekly load, monotonicity, and strain, as well as the comparison to previous weeks.
14 January 2026
Estimate your recovery time after a workout based on the type of workout, intensity, duration, sleep, muscle soreness, and HRV—using the time trends from the literature.
5 January 2026