Sport and recreation

Race split planner calculator

Even-pace splits, including a final partial split.

Your numbers

Use the units shown. Results update as you change valid inputs.

YOUR RESULT

Even-pace splits, including a final partial split.

THE NUMBERS, EXPLAINED

How to use this calculator.

Even-pace splits, including a final partial split.

Start with your inputs

Enter race distance (km), pace (minutes/km), split length (km). Keep amounts in the units shown on each field. The example is a starting point, not a recommended value.

InputExample value
Race distance (km)10
Pace (minutes/km)5
Split length (km)2

A worked example

With the example inputs above, cumulative split times is 2 km: 10 min; 4 km: 20 min; 6 km: 30 min; 8 km: 40 min; 10 km: 50 min. Change the inputs to explore your own scenario.

All results for the example inputs above
ResultExample answer
Cumulative split times2 km: 10 min; 4 km: 20 min; 6 km: 30 min; 8 km: 40 min; 10 km: 50 min

How this is calculated

Cumulative split times

evenPaceSplits(a,b,c)

Symbols and units
a
Race distance (km)
b
Pace (minutes/km)
c
Split length (km)

Use the units shown. A list keeps the order in which you enter its values. The symbol ^ means “raised to the power of”.

Calculation steps and notation

For each multiple of the split distance, cap the distance at the finish. Cumulative time = that distance × the pace in minutes per kilometre. Include a shorter final split if needed.

Assumptions and limits

Even-pace splits, including a final partial split.

Calculations use the values you enter. Blank or invalid inputs show an error instead of silently substituting zero. Results are displayed to useful precision; calculations retain the underlying numeric precision.

Questions about this tool

What does the result tell me?

Cumulative split times. The result applies to the method and inputs described above. Check the units and assumptions before using it in a decision.

Why might another calculator differ?

Differences in units, rounding, timing or model definitions can produce different answers. Compare the input definitions and the method, rather than only the final number. For this tool: Even-pace splits, including a final partial split.

Are my inputs stored or sent to AI?

Calculations on this page happen in your browser. The separate AI question finder sends its submitted conversation to OpenAI; these calculator fields are not sent. Favourites and recent tool names are stored locally. A shared link contains the inputs you choose to include.

Review status

Software example and browser checks are recorded in our quality report. No external expert review is claimed. Created with coding assistance; calculations run as ordinary browser code.

Read the quality report →