PedalToolbox My Garage
The Garage Tires & WheelsGearing & DrivetrainBike FitSpeed & ClimbingTraining & PowerFuel & HydrationWeight, Cargo & Everyday GarageGuidesAbout

Free bike calculators — no app, no login

Bike calculators for
every number your ride needs.

Save your bike once. Get pressures, gearing, fit and power numbers from calculators that show their work — and already know your setup.

Browse all calculators How it works
  • Published physics, cited
  • Remembers every bike
  • No login, ever
My garage · Bike 1 Free
Units
Bike type
Front — psi  
Rear — psi  

Enter your weight — pressures update as you type.

Full calculator — rim width, tubeless, hookless →

  1. 1

    Add your bike

    Weight, type, tires — thirty seconds, saved on your device.

  2. 2

    Open any calculator

    Your numbers are already filled in. Change one, see everything update.

  3. 3

    Compare before you buy

    Cassettes, wheels, whole bikes — see the difference in numbers, not marketing.

The toolbox

Every calculator, grouped the way you ride

Set up your bike once — every tool remembers it.

Tires & Wheels

Pressure, sizing and the rotating-mass truth.

Tire Pressure Front and rear psi from your weight, tire width, rim and surface — with hookless limits built in. Wheel Circumference The number your bike computer wants — from any tire size, corrected for rim width, or from a roll-out. Tire Size Converter Any sidewall size → ETRTO, every other name it’s sold under, and the lookalikes that won’t fit. Rim & Tire Compatibility Inner rim width × tire width on the ETRTO 2024 chart — what fits, what it will measure, and the hookless rules. Wheel Weight Savings Does rotating mass really count double? Seconds saved on a real climb, computed.

Gearing & Drivetrain

Every ratio, every jump — before you buy the cassette.

Gear Ratio Your full gear chart with speed at any cadence, in every gear. Gear Inches Fixed-gear and singlespeed gearing in inches, meters and gain ratio — skid patches, a printable chart and the hills your gear can climb. Cassette Comparison Two cassettes sprocket by sprocket, with the jump between each gear. Chainring Comparison 50/34 vs 52/36 vs 48/35 — what actually changes. 1x vs 2x Gearing Range, lowest gear, jumps and overlap — the whole trade-off in numbers. Chain Length Chainstay, chainrings and cassette → the links you need and the chain to buy — with a singlespeed solver.

Bike Fit

Starting points from your body — not a bike fit, and we say so.

Frame Size Height and inseam → starting size, and a real answer when you fall between sizes. Saddle Height The classic methods on one ruler, the spread between them, and how to fine-tune. Stack & Reach The two numbers that actually describe fit — compare any frames.
Bike Fit Comparison In the works Two bikes or sizes, geometry side by side — the N+1 shopping tool.
Stem Length Current vs desired position → the stem that gets you there. Crank Length A starting range from your dimensions — and why it barely changes power. Handlebar Width Shoulder width → bar width, road narrow-aero and gravel flare included. Saddle Setback Where the saddle sits behind the bottom bracket, and why it matters.

Speed & Climbing

Real physics — the Martin power model, cited and shown.

Power ↔ Speed Watts to speed or speed to watts, on your bike, at your weight. Climb Time Gradient, distance, weight and power → your time up the climb. Speed · Distance · Time Any one from the other two — with a target-time race pace mode. Hill Gradient Rise and run → percent grade, and what that number feels like. Elevation Gain Rate any route’s climbing — gain per mile, from flat to mountainous. VAM Vertical meters per hour — the climbing-rate number the pros use. Aero Drag (CdA) Measure your CdA from a steady ride — power, speed, weight and the day’s air — with an honest error bar. Aero Savings What an aero change saves at your power over your distance — seconds, watts and dollars per second — not the marketing department’s 45 km/h. Climb Weight Savings Drop a kilogram from bike or body → seconds saved on your climb, the same kilogram in watts, and dollars per second.

Training & Power

FTP, zones and load — the winter toolbox.

FTP 20-minute, ramp or 8-minute result → FTP, with the corrections the factors skip. Power Zones FTP → your seven training zones, printable for the trainer wall. Watts per Kg The number everyone compares — with published category benchmarks. Critical Power Two or more all-out efforts → CP and W′, what they predict, and how CP squares with your FTP. Training Stress (TSS) Score a ride from normalized or average power, plan one for a target — and what a week of it does to fitness. Heart Rate Zones Zones from LTHR, max HR or heart-rate reserve — printable, with your watts beside the beats.

Fuel & Hydration

What to eat and drink, from ride length — not from gel marketing.

Ride Fueling Duration and intensity → carbs per hour, as a printable ride plan. Hydration Heat, duration and effort → a starting fluids-per-hour number. Sweat Rate Weigh in, ride, weigh out → your personal liters per hour. Calories Burned From actual watts, not activity tables — the kJ ≈ kcal math.

Weight, Cargo & Everyday

Bikepacking, commuting, kids bikes and the tinkering.

Bike Build Weight In the works Add up a build part by part — before the scale tells you the truth.
System Weight In the works Rider + bike + kit + bottles — the number the physics actually uses.
Bikepacking Weight In the works Gear by bag location → loaded bike and per-bag weights.
Commuting Savings In the works Bike vs car or transit → what a year of riding to work saves you.
Kids Bike Size Height and inseam → wheel size that fits now, with room to grow. E-Bike Range Battery, assist level and terrain → miles you’ll actually get.
Suspension Sag In the works Travel and target percentage → the sag measurement to set.
What to Wear Cycling Temperature, speed and effort → the kit to wear, the wind chill you ride in, and a printable closet chart. Disc Brake Adapter Frame or fork mount + the rotor you want → the adapter, with the 200 vs 203 mm trap flagged.
Spoke Length In the works ERD, hub geometry and lacing → spoke lengths, measured carefully.

The Garage

One rider. Every bike.
All connected.

Enter your weight, height, inseam and FTP once. Save each bike you own. Then every calculator on the site starts from your numbers — and switching bikes switches everything.

Deciding between the road bike and the gravel bike for Sunday? Compare them, gear by gear, pressure by pressure.

Open the Garage

Math you can check

The physics comes from published models — the Martin power equation, ETRTO rim standards, Coggan training zones — cited on each page, with a “show the math” breakdown on every result.

Limits before numbers

A calculator that prints an unsafe number is worse than none. Ours flag hookless pressure limits, derailleur capacity and component maximums instead of pretending they don't exist.

Honest recommendations

When a result suggests a product, it's the one the math justifies — and we say so when the cheap option wins. Some links earn us a commission; that never changes the numbers.