Pedalmath
Cycling calculators you can trust
Cycling calculators built on real industry data: tire pressure, gearing, chain wear, bike size and ride nutrition. Free, no signup, six languages.
Explore calculators ↓Industry-grade math
Calibrated against real-world cycling data. Tuned per bike type, drivetrain and tire — not a generic chart.
Built for every bike
Road, gravel, MTB, fat, touring. SRAM, Shimano, Campagnolo — both current 12-speed and 5–8-year-old classic groupsets.
Private, no signup
No email, no tracking, no ads. Everything runs in your browser. Six languages.
Calculators
Tire pressure calculator
Optimal pressure for any bike type, separately for front and rear wheels. Accounts for surface, weather, riding style. PSI and Bar.
Open →
Gear ratio calculator
Gear ratio, gear inches and speed at any cadence for every gear combination. Presets for SRAM, Shimano and Campagnolo groupsets, any wheel size.
Open →
Chain wear calculator
Two modes: precise wear from a 12- or 10-link measurement, and a mileage-based estimate. Replacement thresholds for 1–13-speed drivetrains.
Open →
Bike size calculator
Frame size from your height and inseam — for road, gravel, MTB and hybrid bikes. Bonus: a starting saddle height via the LeMond formula.
Open →
Nutrition calculator
Carbs, fluid, sodium and calories for a long ride — per hour and total, with a fueling schedule. Based on sports-nutrition guidelines.
Open →How it works
Each Pedalmath calculator is built on a physical model tuned against real cycling data — not a generic chart. Tire pressure uses rider+bike weight, tire width, surface and weather, with the result shown as a ±5% window because comfort, grip and rolling efficiency balance inside a small range. Gear ratios use Sheldon Brown's classic method (ratio, gear inches, development and speed at cadence) with presets for SRAM, Shimano and Campagnolo across both modern 12-speed and 5–8-year-old classic groupsets.
Frequently asked questions
Why calculate tire pressure?
Wrong pressure costs you watts on the road, traction on dirt, and pinch flats on square hits. The right pressure makes the bike feel planted, faster and more comfortable.
How accurate are the results?
The calculator is calibrated against real-world pressure data and stays within ±5 PSI of typical recommendations for road, gravel and MTB setups. Use it as a starting point and fine-tune by feel.
Is it really free?
Yes. No signup, no premium tier, no paywalls. The site runs on free hosting. If you find it useful, share it with a riding buddy.
What about tubeless and hookless rims?
Tubeless is the default — flip the toggle if you run inner tubes (we add about 8 PSI). For hookless rims we cap output at 72.5 PSI and warn you if the recommended pressure would exceed that limit.
What's a gear ratio?
It's how many times the rear wheel turns for one pedal revolution. A 4.0 ratio = three wheel turns per pedal stroke (a 'hard' gear for high speed). A 1.0 ratio = one wheel turn per stroke (a 'low' gear for steep climbs). Gear inches is the same concept normalised by wheel size, so you can compare gearing across road, gravel and MTB.
1× or 2× — which should I choose?
1× drivetrains (one chainring) are simpler, lighter, and shift cleanly under load — great for gravel and MTB. 2× setups (two chainrings) keep tighter spacing between gears, which matters on the road where you want to hold a precise cadence. Use the gear ratio calculator to compare any two setups.
What cassette do I need for steep climbs?
On a road bike, an 11-32 or 11-34 cassette with a compact (50/34) crankset gives you a low-enough bailout for 10–12% grades. For sustained steep gravel and MTB, look at 10-44, 10-51 or 10-52 — these put the lowest gear below a 1.0 ratio, so you can spin 70 RPM at walking pace.