Health & Fitness
Plan training, rest and family with calculators for running pace, one-rep max, heart rate zones, sleep cycles, water intake, ovulation and pregnancy due dates. Every result shows how it was worked out, and nothing you enter leaves your browser.
7 tools
Work out running pace, finish time or distance, with splits and speed for any race.
Find the best time to go to bed or wake up based on 90-minute sleep cycles.
Estimate your due date, current pregnancy week, trimester and key milestones.
Estimate ovulation day, fertile window and next periods for the coming cycles.
Estimate your 1RM from any set with seven formulas, a percentage table and plate loading.
Calculate your max heart rate and five training zones with the Karvonen method.
Estimate how much water to drink a day from weight, exercise and climate.
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