Ask a room full of cyclists how many carbs you should take per hour on the bike and most of them now know the answer — 60 to 90 grams, more if you've trained your gut. The on-bike fuelling message has finally landed. But ask the same room how many carbs they should eat per day, off the bike, and you'll mostly get blank looks. And that's a problem, because the daily number is where most amateurs quietly sabotage everything they're trying to build.
Here's what nobody tells you: the carbohydrate that fuels your training isn't just the gels you eat during a ride. It's the rice, the potatoes, the bread, the oats you eat across the whole day around it. Get the daily total wrong — and most riders get it wrong in a very specific way — and the best training plan in the world falls apart underneath you. Let me break down what a cyclist actually needs per day, and why the number isn't fixed.
Set it per kilo, and match it to the work
The first thing to understand is that there is no single right number, because a 60kg climber and a 90kg rouleur have very different needs, and a five-hour mountain day and a rest day have very different demands. So the useful way to think about daily carbohydrate is in grams per kilogram of bodyweight, scaled to that day's training.
The sports nutrition guidelines — the framework that came out of the work of researchers like Louise Burke and the international consensus on athlete fuelling — lay it out roughly like this:
A rest or easy day sits at around 3 to 5 grams per kilo. Not much riding, not much fuel needed. A moderate training day, say an hour or so of riding, lands at around 5 to 7 grams per kilo. A hard or long day — a big endurance ride, a serious interval session — climbs to 6 to 10 grams per kilo. And a very high-volume day, the kind of four or five hours a committed rider does at the weekend, can reach 8 to 12 grams per kilo.
Put real numbers on it. An 80kg rider on a hard day, at the middle of that range, is looking at somewhere around 500 to 700 grams of carbohydrate across the whole day. On a rest day, the same rider might need barely half of that. The range is enormous, and that's the entire point: your daily carbohydrate should breathe with your training, not sit at one flat number.
Most amateurs do it exactly backwards
Now here's the mistake, and once you see it you'll see it everywhere, probably including your own kitchen.
Most amateurs fuel their days the wrong way round. On the rest day, sitting at a desk, they eat a normal-to-generous amount of carbohydrate, because the food is there and the day feels long. Then on the hard day — the big Saturday ride, the brutal interval session — they're busy, they're rushed, they skip the proper pre-ride meal, they under-eat afterwards, and they wonder why the session felt flat and why they're wrecked for three days.
It's the wrong way round. The day you need the carbohydrate is the day you train hard. The day you don't is the day you rest. Flip your fuelling so the food follows the work: load the carbohydrate around your key sessions — a proper meal before, fuel during, and a carbohydrate-rich refuel after — and ease right off on the easy and rest days. This is the whole idea behind fuelling for the work required, and getting the daily distribution right does more for most amateurs than any clever supplement.
The trap that quietly ruins training
There's a deeper version of this mistake, and it's the one I care about most because it's so common and so damaging. It's the "ride more, eat less" trap.
The cycling internet has spent years telling riders that to get lighter and faster, you ride more and eat less, and carbohydrate is the first thing people cut. So they grind through their training on chronically low daily carbohydrate, feeling virtuous, and they slowly fall apart. The hard sessions lose their quality because there's no fuel to power them. Recovery stalls because you rebuild your glycogen stores from the carbohydrate you eat, and if it's not there, you start every session already in a hole. Sleep suffers, mood suffers, and the watts that were supposed to come never arrive.
I learned this one personally. I lost 7 kilos in twelve weeks while eating more food than I'd ever eaten, because I fuelled the work properly instead of starving it. The story's in the episode where I talk through it, and the lesson holds for almost everyone: chronic under-fuelling of carbohydrate doesn't make you lighter and faster, it makes you tired and stuck. The fuel isn't the enemy. The training it powers is what makes you faster.
Fuelling right while still losing weight
"But I want to lose weight," I hear you, and you can, without falling into that trap. The answer isn't slashing carbohydrate every day. It's periodising it.
Keep your carbohydrate up around your key hard sessions, so they stay high quality and your body adapts to them. Pull it back on the easy days and the rest days, where you genuinely don't need much. Across the week, that can still leave you in a modest overall energy deficit — enough to lose weight slowly and sustainably — but with the crucial difference that the training that actually makes you faster is fully fuelled. You lose the weight around the work, not by sabotaging it. That's the fuel-for-the-work-required approach to weight loss, and it's how you get lighter without getting slower.
The practical version
You don't need to weigh every gram. You need to get the shape right, and the shape is simple.
On a hard or long training day, anchor the day around the session. Eat a proper carbohydrate-rich meal two to three hours before, fuel on the bike, and refuel within an hour or two after with carbohydrate and some protein — the recovery window where your body is primed to restock. Across that day, the carbohydrate is high: generous portions of rice, pasta, potatoes, bread, oats, fruit. On an easy or rest day, you simply don't need that — pull the portions back, lean a little more on protein and vegetables, and let the carbohydrate match the lower demand.
Set your protein steadily across all of it — around 1.6 to 2.0 grams per kilo a day, as the protein guide lays out — and let the carbohydrate be the part that flexes with your training. That single habit, carbohydrate that breathes with the work, is the foundation of fuelling that almost no amateur gets right.
What it looks like on a plate
Grams per kilo is useful for setting the target, but nobody eats a spreadsheet, so here's what the difference actually looks like for that 80kg rider across two very different days.
On a hard or long day — a four-hour ride with real intensity — the plates are full. Porridge with banana and honey two to three hours before. Fuel on the bike. A proper refuel straight after, something like rice with chicken and vegetables, or a big bowl of pasta. Then a normal dinner with a generous carbohydrate portion, and probably a snack in the evening. Carbohydrate is present at every meal and the portions are unapologetic, because the day demanded it.
On a rest day, the same rider eats a noticeably different plate. Eggs and some fruit rather than a big bowl of oats. A lunch built more around protein and vegetables with a moderate carbohydrate portion rather than a mountain of rice. A normal dinner, smaller on the starch. Nothing is banned, but the big carbohydrate portions that fuelled the hard day simply aren't needed, so they come down. Same rider, same week, two genuinely different days of eating — because the training was different.
That's the whole habit in one image: the plate follows the work. Get that right and you rarely need to count anything.
A note for masters riders
One addition if you're over 40, because it cuts the other way and it matters. The temptation as you age is to eat less of everything, including carbohydrate, in the belief that a slower metabolism demands it. Be careful. Older riders recover more slowly already, and under-fuelling the hard days makes that worse, not better. If anything, fuelling your key sessions properly becomes more important with age, because the margin for under-recovery shrinks. Periodise, yes — but don't let "eating less as I get older" quietly starve the training you're relying on to stay fast.
The one number that matters
So how many carbs should a cyclist eat per day? The honest answer is: it depends entirely on the day. Three to five grams per kilo when you rest, up toward eight to twelve when you ride long and hard, and everything in between.
But if you take one thing from this, take the shape, not the numbers: fuel the hard days properly, ease off on the easy ones, and never fall for the idea that eating less carbohydrate makes you faster. It makes you tired. The riders who get fit are the ones who fuel the work — and the work, fuelled, is what makes them fast.
For the framework behind this, read fuel for the work required explained, and for the on-bike side, how many carbs per hour. If you want your fuelling built around your actual training week, we do that on Skool.