Skip to content
ENExplore Calculators

Carbohydrate Requirement Calculator

Work out carbohydrate requirement instantly with clear inputs, formula shown and shareable results.

About Carbohydrate Requirement Calculator

Converts a percentage of energy from carbohydrate into grams at 4 kcal per gram, and indexes it to body weight for training comparison.

Formula

Carbohydrate target

Grams = energy intake x carbohydrate share / 4 kcal per gram

Worked example

With the default values below, Carbohydrate Requirement Calculator returns Daily carbohydrate target of 300.0. Change any input above and every figure here is recalculated in your browser.

Inputs used

Daily energy intakeaccepts 800–6,000 kcal
2,400 kcal
Share of energy from carbohydrateaccepts 5–75
50
Weightaccepts 20–300 kg
70 kg

Results

Daily carbohydrate target
300.0 g
Carbohydrate per kilogram
4.286 g/kg
Energy from carbohydrate
1,200 kcal
15 g carbohydrate portions
20.0

Step by step

  1. 1Values used
  2. 2Carbohydrate target
  3. 3Daily carbohydrate target= 300.0 g
  4. 4Carbohydrate per kilogram= 4.286 g/kg
  5. 5Energy from carbohydrate= 1,200 kcal
  6. 615 g carbohydrate portions= 20.0

Assumptions and limits

  • The result is derived only from the 3 inputs listed above. Anything not among them is not part of the calculation.
  • In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
  • Figures are rounded for display to 3 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.
  • Educational estimate only. Not a substitute for professional clinical judgement, and must not be used to make treatment or dosing decisions.
  • This is an estimate for general information and not professional medical advice. See the full disclaimer for the limits that apply to this kind of calculator.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Educational estimate only. Not a substitute for professional clinical judgement, and must not be used to make treatment or dosing decisions.

Frequently Asked Questions

What range do guidelines suggest?

The acceptable macronutrient distribution range is 45 to 65% of energy; endurance athletes often need 6 to 10 g/kg.

Is there a minimum requirement?

The reference intake is 130 g a day to supply the brain, though the body can adapt using ketones.

Related Calculators

Carbohydrate Requirement Calculator | Calcrivo