Compare calculators

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

Marathon Time Predictor

Predict your marathon finish time from a recent 5K, 10K, or half marathon result using empirical scaling factors tuned to typical recreational runners. Use it to set a realistic goal before your first marathon or to validate a training cycle.

Race Distance (km)

Race Time (minutes)

Fill in the required fields to see your result.

Running

Race Pace Calculator

Find the exact per-mile or per-kilometer pace you need to hit your finish-line goal. Enter your race distance and target time to instantly see the required split.

Race Distance (miles)

Goal Time Hours (hours)

Goal Time Minutes (minutes)

Fill in the required fields to see your result.

Key differences

	Marathon Time Predictor	Race Pace Calculator
Category	Running	Running
Inputs required	2	3
Result	Predicted Marathon Time (minutes)	Target Pace (min/mile)
What it does	Predict your marathon finish time from a recent 5K, 10K, or half marathon result using empirical scaling factors tuned to typical recreational runners. Use it to set a realistic goal before your first marathon or to validate a training cycle.	Find the exact per-mile or per-kilometer pace you need to hit your finish-line goal. Enter your race distance and target time to instantly see the required split.