Free cycling tools & calculators
Small, free calculators for the numbers that come up when you set up a bike. No account, no sign-up — open one and use it.
PSI ⇄ Bar converter
Convert bike tyre pressure between psi, bar and kPa as you type, with a conversion table and starting pressures by tyre width.
Convert tyre pressure →Bike frame size calculator
Get your frame size from your height and cycling inseam, for road, gravel, mountain and hybrid bikes, with a size chart for each.
Find my frame size →Saddle height calculator
Estimate your saddle height from inseam with the LeMond method, measured from the bottom bracket to the top of the saddle.
Find my saddle height →Saddle setback calculator
See how far behind the bottom bracket your saddle sits, and how that compares with the range road and time-trial riders use.
Find my saddle setback →Stem length calculator
Compare two stem setups and see how much reach and height you gain or lose from stem length, stem angle and spacers.
Compare stem setups →Stack and reach calculator
Carry frame stack and reach up through your stem and spacers, and compare where two bikes really put the handlebar.
Compare two bikes →
Which tool do I need?
Use the frame size calculator before you buy a bike: the frame is the one part you cannot adjust later. Use the PSI ⇄ Bar converter when a pump, a sidewall or a pressure chart gives you a unit your gauge does not show.
Neither one tells you if your riding position is right. A frame in the correct size can still leave your saddle too high or your reach too long — that is what a bike fit measures.
These tools give you numbers. Pedalyze gives you your position: knee, hip and back angles measured from two photos, with pass/warn/fail against reference ranges.