How Much Protein Do You Need?
The RDA was written to prevent deficiency. Riders who train need more, and the goal decides how much.
Your Protein Target
| Food | Protein | For one meal |
|---|
Targets follow the International Society of Sports Nutrition position stand on protein and exercise, with the fat-loss goal set per kilogram of fat-free mass. Food values are approximate USDA figures. Anyone with kidney disease should set protein with their physician.
How It Works
Body weight times a goal multiplier, nudged by training load, age, and diet, then divided across meals.
The Formulas
Weight (kg) = weight (lb) / 2.2046 Daily target = weight (kg) x goal multiplier (training load picks the point inside the range) Fat-loss goal: daily target = fat-free mass (kg) x 2.3 to 3.1, fat-free mass = weight x (1 - body fat %) Age 65 and over: lower bound raised to 1.2 g/kg (1.2 to 1.4 for the health goal) Vegetarian x 1.10, vegan x 1.15 Per meal = daily target / meals per day After a hard ride = 0.3 to 0.4 g/kgThe Multipliers and Where They Come From
| Goal | g per kg per day | Source |
|---|---|---|
| General health, light riding | 1.0 to 1.2 | Above the 0.8 g/kg RDA, the floor that prevents deficiency, and in line with the PROT-AGE minimum for active adults |
| Endurance training and racing | 1.4 to 1.8 | ISSN position stand, 2017: 1.4 to 2.0 g/kg for exercising adults, with endurance riders in the lower half |
| Build muscle and strength | 1.6 to 2.0 | ISSN position stand, 2017; a 2018 meta-analysis of 49 trials found gains plateau around 1.6 g/kg, with an upper confidence bound of 2.2 |
| Lose fat, keep muscle | 2.3 to 3.1 per kg of fat-free mass | ISSN position stand, 2017, for lean trained people in a calorie deficit |
Training load moves you inside the range: under 5 hours a week lands at the bottom, 5 to 10 in the middle, more than 10 at the top. Riders of 65 and over get a floor of 1.2 g/kg, the level the PROT-AGE study group recommends for active older adults to hold on to muscle. The vegetarian and vegan adjustments of 10 and 15% offset the lower digestibility of fiber-rich plant proteins, a common dietitian rule of thumb rather than a position-stand figure.
Per Meal and After the Ride
Muscle protein synthesis responds to each meal, so the day's total works best spread out. A 2018 review in the Journal of the International Society of Sports Nutrition suggested about 0.4 g/kg per meal across four meals as a practical way to reach 1.6 g/kg a day; the calculator divides your target by the meals you eat and shows what one of them looks like in food. The after-ride serving of 0.3 to 0.4 g/kg (22 to 30 g for a 75 kg rider) is one of those meals, taken within a couple of hours of a hard session, not an extra on top of the daily total.
A Worked Example
A 165 lb (74.8 kg) rider, 40 years old, omnivore, training 5 to 10 hours a week for endurance racing: the range is 1.4 to 1.8 g/kg, the middle of it is 1.6, and the target is 120 g a day, or 30 g at each of four meals. That is a chicken breast, or a cup of Greek yogurt with a scoop of whey, or a cup and a half of cooked lentils with a glass of milk. The same rider cutting weight for a hill-climb season at 18% body fat has 61 kg of fat-free mass and a target of 140 to 190 g; at 165 g a day protein takes about a quarter of a 2,600-calorie deficit day.
What the Calculator Does Not Do
It does not set calories or carbohydrate, which for an endurance rider are the bigger levers on the bike; protein's job is recovery and keeping muscle, not fuel. It also assumes healthy kidneys. The intakes here are safe for healthy adults by the ISSN's reading of the evidence, but anyone with kidney disease should set protein with a physician. Pair the target with the cycling calories calculator to size the rest of the plate.
Sources: Jäger R, Kerksick CM, Campbell BI, et al. International Society of Sports Nutrition position stand: protein and exercise. JISSN, 2017. Morton RW, Murphy KT, McKellar SR, et al. A systematic review, meta-analysis and meta-regression of the effect of protein supplementation on resistance training-induced gains in muscle mass and strength. British Journal of Sports Medicine, 2018. Schoenfeld BJ, Aragon AA. How much protein can the body use in a single meal for muscle-building? JISSN, 2018. Bauer J, Biolo G, Cederholm T, et al. Evidence-based recommendations for optimal dietary protein intake in older people: the PROT-AGE study group. JAMDA, 2013.
Frequently Asked Questions
- How much protein does a cyclist need per day?
- A cyclist who trains regularly does well on 1.4 to 1.8 grams of protein per kilogram of body weight per day, which for a 165 lb (75 kg) rider is 105 to 135 grams. The range comes from the International Society of Sports Nutrition position stand, whose 1.4 to 2.0 g/kg covers most exercising adults. Big training weeks sit at the top of the range, easy weeks at the bottom. The RDA of 0.8 g/kg is the floor that prevents deficiency, not a target for training.
- How should I spread protein across the day?
- Four meals of about 0.4 grams per kilogram each, roughly 30 grams for a 75 kg rider, is the distribution a 2018 review in the Journal of the International Society of Sports Nutrition suggested for maximizing muscle protein synthesis. Three larger meals work too; the daily total matters more than the exact spacing. Put one of the servings within a couple of hours after a hard ride, when muscle is most responsive.
- Do vegetarian and vegan cyclists need more protein?
- Plant-based cyclists hit the same targets by eating a little more and mixing sources: beans with grains, soy, lentils, and seitan cover the amino acids that any single plant falls short on. The calculator adds 10% for a vegetarian diet and 15% for a vegan one to offset the lower digestibility of fiber-rich protein sources, a common dietitian adjustment. Tofu, tempeh, and a soy or pea protein powder make the post-ride serving easy.
- Does a higher protein intake help when I am trying to lose weight for climbing?
- Yes. Keeping protein high while cutting calories is what preserves muscle and power as the scale drops: the sports nutrition literature points to 2.3 to 3.1 grams per kilogram of fat-free mass per day during a calorie deficit, which the calculator applies when you pick the fat-loss goal. Protein also keeps you fuller than the same calories from carbohydrate. Keep the deficit modest, around 500 calories a day, so the hard sessions still get done.
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