Free Cycling Tools & Calculators

Practical calculators for fuelling, bike fit, gearing and power — free to use, no signup, built by cyclists.

Nutrition & Hydration

Dial in carbs, fluids and race-day fuelling.

Carbs per hour from ride duration, intensity and weight.

Fluid and sodium targets tuned to sweat rate and heat.

A ready-to-pack timeline of gels, bars and bottles.

Compare stems and integrated bars before you buy.

See how length and angle move your bar reach and stack.

Match one-piece cockpit reach, drop and width to your fit.

Ratios, gain ratios, speed and FTP-based power.

Chainring × cassette ratios, gain ratios and speed at cadence.

Estimate the power, speed and gearing you need to hold a pace.