How to Use the Pace Calculator - Step by Step
The pace calculator turns any two of distance, time and pace into the third, live as you type. These are the exact inputs, what each accepts, and how to read the result and the split table.
Step 1 - open the tool
Open the calculator and a full result is already on screen: the form loads pre-filled with a 5K in 25:00, so the required pace - 5:00 min/km, 8:03 min/mile - the speed in km/h and mph, and the checkpoint table are visible before you type anything.
Step 2 - pick what to solve for
The first select offers three questions: pace from distance and time (the default), finish time from distance and pace, and distance from time and pace. The input group being solved is hidden, so the form only ever asks for the two numbers it needs.
Step 3 - set the distance
Type any distance, or pick a race preset - 5K, 10K, half marathon or marathon - and the field fills with the exact figure (21.0975 km for the half, 42.195 km for the full) in whichever unit is selected.
Step 4 - enter the time or the pace
Time is entered as hours, minutes and seconds; pace as minutes and seconds per kilometer or per mile. Every change recalculates immediately - there is no submit button - and a zero or missing value shows a plain prompt naming what to enter instead of a broken result.
Step 5 - switch units if you need to
The unit select flips between kilometers (pace in min/km) and miles (pace in min/mile). Switching converts the distance and pace you already entered in place - a 5 km / 5:00 min/km plan becomes 3.11 miles at 8:03 min/mile - so the result stays equivalent instead of resetting.
Step 6 - read the result and the split table
The answer line is followed by the pace in both min/km and min/mile and the speed in both km/h and mph, so one entry covers a race plan, a treadmill setting and a watch reading. Below it, an even-pace table projects cumulative times at 1 km, 1 mile, 5K, 10K, 15K, half marathon, 30K and the marathon. The result block itself says what the numbers are: even-pace planning estimates, not a coaching, training or medical tool. Nothing you type is stored or sent anywhere, so note down the plan before closing the tab.
The situations where solving the runner's triangle pays off are in the use-cases guide; the honest comparison with a GPS watch, a printed pace chart and a spreadsheet is in the alternatives guide.
Why trust these tools
- Ten-plus years of web tooling. The freetoolonline editorial team has shipped browser-based utilities since 2015. The goal has never changed: get you to a working output fast, without an install.
- No install, no sign-up. Open a tool and get a working output in seconds - nothing to download and no account to create. Tools that need heavy processing run it on our service, so even a low-powered machine gets the job done.
- Analytics stops at the page view. We measure which pages get visited, not what you type or upload inside a tool. There is nothing to sign in to and no profile is attached to your input.
- Open-source core components. The processing engines underneath (libheif, libde265, pdf-lib, terser, clean-css, ffmpeg.wasm, and others) are public and audit-able. We link to each one in its tool page's footer.
- Free, with or without ads. All tools are fully functional without sign-up. The Disable Ads button in the header is always available if you need a distraction-free run.