How the carb target is calculated
You begin with a daily calorie figure and decide what share of those calories should come from carbohydrate. The calculator turns that percentage into calories, then divides by four because each gram of carbohydrate supplies about four calories.
The pie chart shows carbohydrate calories against the rest of your day so you can see the balance against protein and fat at a glance.
How many carbs do you need
Mainstream dietary guidance places carbohydrate at roughly 45 to 65 percent of total calories, with around 50 percent a sensible default for most people. Your ideal share depends on activity and goals.
- Endurance athletes and high-volume trainers often sit at the higher end to fuel performance.
- People following lower-carb approaches may choose well below 45 percent and raise fat instead.
- Favour fibre-rich whole grains, fruit, vegetables and legumes over refined sugars.
- Carbohydrate is the body’s preferred fuel for high-intensity exercise.
Reading the result
The headline number is the grams of carbohydrate to aim for across the whole day, not per meal. Spreading it across meals, with more around training, is usually easiest to follow.
Carbohydrate also affects water weight, since the body stores it with water, so day-to-day scale changes are normal and not the same as fat gain or loss.
A note on health
This is general nutrition guidance, not medical advice. Carbohydrate needs vary with health conditions such as diabetes. If you are managing a condition or making large dietary changes, consult a doctor or registered dietitian.
Formula
carb grams = (calories · percent / 100) / 4Frequently asked questions
- How many calories are in a gram of carbohydrate?
- Carbohydrate provides about 4 calories per gram, the same as protein and less than fat (9 calories per gram).