Free tools, built by a coach — not a spreadsheet
RunPaceData exists so runners can get accurate answers fast, without an account, a paywall, or an ad chasing them down the page.
Why this site exists
Most running calculators online are either buried in ads, gated behind a sign-up, or just... wrong. RunPaceData was built to fix that: real, published formulas (Riegel for race predictions, Karvonen for heart-rate zones), clean results, and nothing standing between you and the number you came for.
Who's behind it
RunPaceData is built and maintained by the coach behind CM Performance Coaching. The tools here are the same math used to build real training plans for real athletes — they're just as useful whether you ever become a coaching client or not.
What you'll find here
- Running Pace Calculator — solve for pace, time, or distance.
- Race Time Predictor — estimate a finish time at a new distance from a recent race.
- Heart Rate Zone Calculator — find your five training zones.
- Running Split Calculator — plan even, negative, or positive splits.
- Marathon Pace Chart — see your split at every checkpoint for a goal time.
Three more tools — a cadence calculator, VO2 max estimator, and training zone planner — are in progress.
Free tools, honest funnel
RunPaceData doesn't run ads and doesn't sell your data — there isn't any to sell, since nothing here requires an account. Instead, every page links to CM Performance Coaching. If a calculator answers your question, that's the whole point. If you want a coach to build a plan around those numbers and hold you accountable to it, that's what's on the other side of those links.
See what coaching with CM Performance looks like
Unlimited training plans, weekly check-ins, and direct access to a coach who already knows how to read these calculators.