How much should I drink per hour cycling?

Most riders need 500-1000 ml per hour depending on intensity and temperature. In hot conditions this can rise to 1000-1500 ml/hr. Aim to replace 60-80% of sweat losses.

What about electrolytes?

For rides over 90 minutes, add electrolyte mix to your bottles. Sodium is the most important electrolyte lost through sweat.

Can I drink too much?

Yes, overhydration (hyponatremia) is a real risk, especially on long rides. Do not force fluid beyond comfort. A good guide is to drink to thirst and ensure some sodium intake.

How big is a standard bike bottle?

A standard bike bottle is 750 ml. Large bottles are 800-950 ml. Most bottle cages fit both sizes.

BikeCalcs

Hydration Calculator — Fluid Intake for Cycling

Calculate fluid intake requirements based on duration and temperature.

Body Weight

Your body weight — sweat rate scales with mass

Ride Duration

How long you will be riding

TemperatureAmbient temperature during the ride

IntensityHow hard you will ride — sweat rate rises with effort

How We Calculate This

Hydration Estimation

Fluid per hour = Base sweat rate × Body weight × Intensity factor × Temperature factor
Total fluid = Fluid per hour × Duration
Bottles needed = Total fluid / Bottle size

Frequently Asked Questions

Related Calculators

Ride Calorie Calculator

Estimate total calories needed for a ride based on duration and intensity.

Carb Loading Calculator

Plan carbohydrate loading for race preparation.

Electrolyte Calculator

Calculate sodium and electrolyte needs for long rides.

Bonk Calculator

Estimate when glycogen stores will deplete without fuelling.

Recovery Nutrition Calculator

Calculate post-ride protein and carb intake for optimal recovery.

Last updated: February 2026

All calculations are estimates. Always verify results and consult a professional bike fitter where appropriate.