PB predictor and pace calculator
Estimate a finish time from current form, or calculate exact pace, splits and a manual cutoff plan.
Pace charts by distance
Read a finish-time table, choose a target and print or share your kilometre or mile splits.
Performance prediction
Enter a recent result and the race you are targeting. We convert your current form to an equivalent finish time. Course energy estimates help compare terrain; they do not yet provide a validated adjustment to your finish time.
Pace, splits and cutoff arithmetic
Convert a target time or pace into an even-pace plan for distances up to 1,000 km. These figures are arithmetic, not a prediction of what you can achieve. The separate predictor above estimates equivalent performance from a recent result.
Compare 5k course models
La Jolla Half Marathon, 10K & 5K
Modelled energy change -7.4%.
St. Croix Crossing Half Marathon 5K
Modelled energy change -6.0%.
Generali Genève Marathon 5K
Modelled energy change -3.3%.
Milton Keynes Marathon 5K
Modelled energy change -2.6%.
Montana Marathon (Billings) 5K
Modelled energy change -2.6%.
Athens Marathon. The Authentic 5K
Modelled energy change -0.2%.
Mercy Health Glass City Marathon 5K
Modelled energy change -0.1%.
NN Night Run Ostrava 5K
Modelled energy change -0.1%.
Why a course-adjusted predictor
Generic predictors assume every course is flat. When a race has a verified GAP profile, this tool uses that measured gradient profile so a target with 300 m of climb is predicted slower than a pancake-flat PB course.