Fitness & Sleep Calculators
Fitness and sleep calculators help you plan training and rest. Work out your running pace, estimate a one-rep max, find heart rate zones and plan a bedtime around sleep cycles. They are planning aids, not training or medical advice, so adjust them to how you feel.
Last updated October 23, 2026
All Fitness & Sleep tools
Health & Fitness · Fitness & Sleep
Pace CalculatorRunning pace, finish time or distance in miles or kilometers
Health & Fitness · Fitness & Sleep
One Rep Max CalculatorEstimated 1RM from weight and reps with seven formulas
Health & Fitness · Fitness & Sleep
Heart Rate Zone CalculatorEstimated maximum heart rate and five training zones
Health & Fitness · Fitness & Sleep
Sleep CalculatorBedtimes and wake-up times planned around 90-minute sleep cycles
Health & Fitness · Fitness & Sleep
Height CalculatorPredicted adult height from parents’ heights or a toddler’s height at age 2
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