Whether you are targeting a sub-25 minute 5K or a sub-50 minute 10K, knowing your expected finish time before race day removes guesswork and lets you set a realistic pace strategy. This calculator gives you precise finish times from two inputs: your target pace per km, or a recent race result at either distance.

If you know your pace (e.g., 5:10/km), the calculator multiplies it by the distance to give exact finish times. If you have a recent 5K time, it derives your implied pace and projects your 10K time — assuming equal-effort pacing. Most runners slow by 3–8% from 5K to 10K, so treat the 10K projection as a target rather than a guarantee.

Use this alongside the Race Time Predictor on this site for longer distances like half marathons and marathons. For training, knowing your 5K goal pace helps you set your tempo run paces, interval targets, and long-run easy paces correctly.