Compare calculators

Both calculators run independently — change the inputs on either side to compare results.

One Rep Max Calculator

Find your theoretical one-rep maximum from a submaximal lift using four established strength formulas. Use the result to set training percentages for powerlifting, strength, or hypertrophy programs.

Weight Lifted (lbs)

Repetitions Performed (reps)

Calculation Formula

Training Percentage

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Sports

Marathon Time Predictor

Predict your full marathon finish time using your recent 10K result and training level. Useful for race-day pacing plans and training block goal-setting.

Reference Race Distance

Race Time (Hours) (h)

Race Time (Minutes) (min)

Race Time (Seconds) (sec)

Weekly Training Mileage (km)

Marathon Experience

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Key differences

	One Rep Max Calculator	Marathon Time Predictor
Category	Sports	Sports
Inputs required	4	6
Result	Training Weight (lbs)	Predicted Marathon Time (minutes)
What it does	Find your theoretical one-rep maximum from a submaximal lift using four established strength formulas. Use the result to set training percentages for powerlifting, strength, or hypertrophy programs.	Predict your full marathon finish time using your recent 10K result and training level. Useful for race-day pacing plans and training block goal-setting.