About PaceCalc
Free running calculators. No accounts, no ads, no tracking. Built and maintained by runners who use the tools themselves.
What PaceCalc is
PaceCalc is a suite of 18+ free running and triathlon calculators — pace, race prediction, training zones, intervals, nutrition, age grading, Boston qualifying, and major-marathon course-specific pacing. Web app and iOS, both free, both ad-free, no account required.
We started with a simple frustration: every other pace calculator was either too basic to plan a race around, or buried under signup walls and ads. We built the tool we wanted to use ourselves.
The Editorial Team
Articles, methodology notes, and training guidance on PaceCalc are written and reviewed by the Editorial Team. Members are runners and triathletes who train, race, and have been doing it long enough to know what advice actually moves the needle versus what just sounds good.
Artyom Sklyarov
Founder & Editorial Lead
Artyom built PaceCalc to be the running tool he wished existed: free, no accounts, no tracking, and accurate enough to actually plan a race around. After 15 years of running and racing, he kept finding pace calculators that were either overly simplistic or buried under signups and ads. PaceCalc is the answer to that.
Methodology
Every calculator on PaceCalc is built on published, peer-reviewed running science — not proprietary "magic." Where a formula or table is used, we name the source. The major ones:
- Race prediction uses the Riegel formula (R. H. Riegel, Athletic Records and Human Endurance, American Scientist, 1981).
- VDOT and equivalent training paces follow Jack Daniels' tables from Daniels' Running Formula, 3rd ed. (Human Kinetics, 2013).
- Heart-rate zones use the Karvonen reserve method (M. J. Karvonen, 1957) and the Tanaka–Monahan–Seals max-HR estimate (Tanaka et al., Journal of the American College of Cardiology, 2001).
- Treadmill grade equivalence uses the 1% rule from Jones & Doust (Journal of Sports Sciences, 1996).
- Age grading uses the World Masters Athletics tables (2023 edition).
Calculators are deterministic — the math is the math. Any approximation we make (heat adjustment, altitude penalty, course difficulty) is documented on the calculator's own page.
What we don't do
We don't run ads, don't sell user data, don't require an account, don't track you across other sites. The site does process basic technical logs through our hosting provider for security and reliability — same as any website — but nothing identifies you, nothing follows you, nothing is sold. Full details: Privacy Policy.
How we make money
We don't, really. PaceCalc is supported by Buy Me a Bagel tips from runners who find the tools useful. The iOS app is free with optional in-app tips. That's the entire model.
Contact
For tool feedback, bug reports, or content corrections: apps@suur.io