What is carb cycling?

Carb cycling is a nutrition strategy where you vary your daily carbohydrate intake — alternating higher-carb and lower-carb days — usually matching the highest carbs to your hardest training days and the lowest to rest days. Protein stays steady; fat moves in the opposite direction to carbs to keep total calories sensible.

How do I set high and low carb days?

Line your day types up with your week: use high-carb days on heavy or high-volume training days, moderate days on lighter sessions, and low-carb days on rest or active-recovery days. A common split is 2–3 high days, 2 moderate days and 2–3 low days per week, but adjust to your schedule and goals.

How many carbs on a high day?

This calculator uses about 5 g of carbohydrate per kg of bodyweight on a high day, 3 g/kg on a moderate day and 1 g/kg on a low day. An 80 kg lifter therefore gets roughly 400 g of carbs on a high day and 80 g on a low day.

Does carb cycling burn more fat?

There is no magic to carb cycling itself — fat loss still comes down to a calorie deficit over time. What cycling can do is keep carbs available for hard training while trimming them on rest days, which some people find easier to stick to than a flat low-carb diet. Total weekly calories matter most.

Who should try carb cycling?

It tends to suit active people and lifters who train hard some days and rest on others, and who already track their intake. It is more complexity than most beginners need — if you are just starting, a steady daily macro target is usually simpler and just as effective.

Carb Cycling Calculator

This carb cycling calculator plans high, moderate and low carb days around your training. Enter your bodyweight and it gives the protein, carbohydrate and fat grams — plus calories — for each day type.

How it works

The calculator scales each macro to your bodyweight in kilograms. Protein stays constant at 2.2 g/kg every day to protect lean tissue. Carbohydrate is the lever you cycle — high on hard-training days, low on rest days — and fat moves in the opposite direction so your total calories do not swing too wildly. Carbohydrate and protein supply 4 kcal per gram and fat 9 kcal per gram, which gives the daily calorie total shown on each card.

The g/kg scheme

Grams per kilogram of bodyweight used for each day type:

Day type	Protein	Carbs	Fat
High day	2.2 g/kg	5.0 g/kg	0.8 g/kg
Moderate day	2.2 g/kg	3.0 g/kg	1.0 g/kg
Low day	2.2 g/kg	1.0 g/kg	1.2 g/kg

A practical starting framework — adjust the totals to your own energy needs and how you feel and perform.

Worked example

An 80 kg lifter on a high-carb day gets 80 × 5 = 400 g carbs, 80 × 2.2 = 176 g protein and 80 × 0.8 = 64 g fat. That is 400 × 4 + 176 × 4 + 64 × 9 = ~2,880 kcal. On a low-carb day the carbs drop to 80 × 1 = 80 g, while protein holds and fat rises to 96 g.

Frequently asked questions

What is carb cycling?: Carb cycling is a nutrition strategy where you vary your daily carbohydrate intake — alternating higher-carb and lower-carb days — usually matching the highest carbs to your hardest training days and the lowest to rest days. Protein stays steady; fat moves in the opposite direction to carbs to keep total calories sensible.
How do I set high and low carb days?: Line your day types up with your week: use high-carb days on heavy or high-volume training days, moderate days on lighter sessions, and low-carb days on rest or active-recovery days. A common split is 2–3 high days, 2 moderate days and 2–3 low days per week, but adjust to your schedule and goals.
How many carbs on a high day?: This calculator uses about 5 g of carbohydrate per kg of bodyweight on a high day, 3 g/kg on a moderate day and 1 g/kg on a low day. An 80 kg lifter therefore gets roughly 400 g of carbs on a high day and 80 g on a low day.
Does carb cycling burn more fat?: There is no magic to carb cycling itself — fat loss still comes down to a calorie deficit over time. What cycling can do is keep carbs available for hard training while trimming them on rest days, which some people find easier to stick to than a flat low-carb diet. Total weekly calories matter most.
Who should try carb cycling?: It tends to suit active people and lifters who train hard some days and rest on others, and who already track their intake. It is more complexity than most beginners need — if you are just starting, a steady daily macro target is usually simpler and just as effective.

Related calculators

Disclaimer. This is an estimate for general fitness planning, not medical or nutritional advice. Energy and macro needs vary between individuals; consult a registered dietitian or your doctor before making major dietary changes.