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We know the future.
No bullshit. Just science.

★ This is your unique Pacelab ID
Don’t lose it! Send it to yourself.
Heat × Elevation = your real finish time
Step one
Your ideal marathon time
4:00:00
: :
Your finish time on a pancake-flat marathon (Berlin, Chicago, Valencia). We'll scale the elevation penalty to your fitness.
:
Your sustainable pace on a flat road. 5:00/km ≈ a 3:31 marathon; 6:00/km ≈ 4:13.
Connect Strava and we'll analyze your recent runs to estimate a realistic marathon time — no guessing. Your race day forecast is privately calculated and not stored.
Step two

Pick another marathon

OR DROP YOUR OWN GPX FILE — 🔒 premium feature
▸ HOVER THE CHART TO COMPARE ELEVATIONS AT THE SAME KM▸ DRAG ACROSS THE CHART TO COMPARE ELEVATIONS AT THE SAME KM
▸ MARATHONS ON CHART · DRAG TO REORDER · CLICK TO TOGGLE▸ MARATHONS ON CHART · TAP TO TOGGLE ·
Search your marathon
← Compare marathon paces — see how you stack up against other runners
Talk to us
Any questions or suggestions?
Want more marathons in the catalogue, or a personal pace calculation for your next race? Send us a message — we'll get back.
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