Last updated: 2026-07-21
By using Pace Calculator and its tools (pace & split calculator, race predictor, training pace calculator, heart rate zone calculator, and grade adjusted pace calculator), you agree to these terms. If you don't agree, please don't use the site.
These tools are free, informational calculators for runners. They run entirely in your browser — we don't collect the numbers you enter, and calculations are not saved on any server. Sharing a plan via the "Share" link encodes your inputs directly in the URL.
Nothing on this site is medical, health, or professional coaching advice. Training pace, heart rate zone, and grade-adjusted pace estimates are based on published exercise-science formulas (Riegel, Daniels & Gilbert, Tanaka, Karvonen, Minetti et al.) applied generically — they are not personalized to your health history, and individual physiology varies. Talk to a doctor before starting or changing a training program, especially if you have an existing health condition.
Results are estimates, not guarantees. Formulas approximate real-world performance and can be affected by fitness, terrain, weather, training history, and other factors these calculators don't account for. Double-check anything you rely on for race-day or medical decisions.
This site and its tools are provided "as is," without warranties of any kind, express or implied. You use them at your own risk. To the fullest extent permitted by law, we aren't liable for any injury, loss, or damage arising from your use of, or reliance on, this site.
We may update these tools or these terms at any time without notice. Continued use after a change means you accept the updated terms.
This is general disclaimer information for a free tool, not legal advice.