How many calories do you burn on a long ride, and how much should you eat after?
A 75 kg cyclist burns roughly 1,500-1,750 kcal on a 3-hour ride at moderate effort, or about 7 kcal per kg per hour. After the ride, eat carbohydrate and 15-25 g of protein within an hour or two. Aim for 6-10 g of carbs per kg across the whole day. Refuel urgently only if you ride again within 8 hours.
The burn estimate and the recovery plan are two different questions. The first tells you how big the day is. The second tells you how to spread the food across it.
How many calories does a long ride burn?
About 7 kcal per kg of bodyweight per hour at a moderate, self-chosen pace. Then scale it up or down for effort. There are two reasonable ways to estimate it, and they land close together.
From METs. The Compendium of Physical Activities lists bicycling at a “self-selected moderate pace” (code 01016) at 7.0 METs. One MET is about 1 kcal per kg per hour, so:
- 75 kg x 7.0 x 3 h = 1,575 kcal.
From a power meter. Kilojoules of work on your head unit are a common stand-in for kilocalories burned. Because energy expenditure rises in a straight line with power output on the bike, as reviewed by Ettema and Lorås (2009), power is the most direct input you can get:
- 160 W average x 3 h x 3,600 s = 1,728,000 J = 1,728 kJ, so about 1,730 kcal.
Both are estimates. Wrist heart-rate devices are less reliable: a 2017 Stanford study found no wrist device estimated energy expenditure with less than 20% error. If you have a power meter, trust it over your watch.
How much of that is extra food?
Less than the headline number, because you’d have burned some of it sitting at home. Subtract your resting burn for the same hours, roughly 1 kcal per kg per hour:
- 75 kg x 1 x 3 h = 225 kcal.
- 1,575 - 225 = about 1,350 kcal on top of a normal day.
How much should I eat on a long-ride day in total?
Your normal day plus the ride’s extra cost. Here’s the arithmetic for a 75 kg, 180 cm, 35-year-old male rider.
- Resting metabolism (Mifflin-St Jeor): 10 x 75 + 6.25 x 180 - 5 x 35 + 5 = 1,705 kcal.
- A normal non-riding day at a light activity level of 1.4 (the FAO/WHO/UNU range for sedentary to light lifestyles starts there): 1,705 x 1.4 = about 2,390 kcal.
- Ride day: 2,390 + 1,350 = about 3,750 kcal.
Whatever you eat and drink on the bike counts toward that total. A rider who takes 60 g of carbs an hour for 3 hours has already eaten 720 kcal by the time they get home.
What should I eat after a long ride?
Carbohydrate first, with a moderate serving of protein. The ACSM, AND and Dietitians of Canada joint position (Thomas, Erdman and Burke, 2016) gives the numbers.
| Target | Guideline | 75 kg rider |
|---|---|---|
| Daily carbs, endurance day (1-3 h) | 6-10 g/kg | 450-750 g |
| Protein in the recovery meal | 0.25-0.3 g/kg | 19-23 g |
| Daily protein | 1.2-2.0 g/kg | 90-150 g |
| Speedy refuelling, next session within 8 h | 1-1.2 g/kg per hour, first 4 h | 75-90 g/h, 300-360 g |
A practical post-ride meal for this rider: a large bowl of rice or pasta, a chicken breast or 3 eggs, fruit, and a drink. That is roughly 120-150 g of carbs and 25-35 g of protein.
Do I need to refuel fast after every ride?
No. Speedy refuelling matters only when the next hard session is within about 8 hours. The joint position notes that glycogen rebuilds at only about 5% per hour, so early carbs maximise a short recovery window.
If tomorrow is a rest day, spread the carbs across your normal meals. Total intake over 24 hours matters more than the first hour. Eating 300 g of carbs in four hours when you aren’t riding again until Thursday adds nothing.
This is the principle that Impey et al. (2018) call “fuel for the work required”. Carbohydrate is matched to the session you just did and the one coming next, not set to one daily amount.
What if I’m trying to lose weight?
Keep most of the deficit off your long-ride days. Riding 3 hours on a 500 kcal deficit leaves you short on glycogen for the next session and slows recovery.
A better pattern is to eat close to maintenance on big days and take the deficit on rest days. The weekly total can be the same; the hard sessions just aren’t the ones paying for it.
How Sweatmeal does this
Sweatmeal reads your ride from Strava, Whoop, Apple Health, Health Connect or another connected source, and adds it to that day’s target once. The carb floor rises with training load, and the deficit shrinks on big days and grows on rest days. Long rides and races on your calendar lift carbs ahead of time. The full calculation is on our methodology page.