Nutrition Label Calculator
Calculate per-serving nutrition and calories from recipe macronutrients.
About Nutrition Label Calculator
Fat carries more than twice the energy per gram of protein or carbohydrate, which is why it dominates calorie content. Fibre is counted at a reduced factor because it is only partially metabolised. Dividing by servings is where label errors usually arise, since the serving count must match the portion size actually used.
Formula
Nutrition Label
Calories = protein × 4 + net carbohydrate × 4 + fibre × 2 + fat × 9
- Atwater factors
- 4 kcal per gram for protein and carbohydrate, 9 for fat
- fibre
- Partially fermented, so counted at about 2 kcal per gram
Worked example
With the default values below, Nutrition Label Calculator returns Calories per Serving of 391.7. Change any input above and every figure here is recalculated in your browser.
Inputs used
- Total proteinminimum 0 g
- 120 g
- Total carbohydrateminimum 0 g
- 300 g
- Total fatminimum 0 g
- 80 g
- Total fibreminimum 0 g
- 25 g
- Number of servingsminimum 1
- 6
Results
- Calories per Serving
- 391.7 kcal
- Total Calories
- 2,350.0 kcal
- Protein per Serving
- 20.00 g
- Carbohydrate per Serving
- 50.00 g
- Fat per Serving
- 13.33 g
Step by step
- 1Values used
- 2Nutrition Label
- 3Calories per Serving= 391.7 kcal
- 4Total Calories= 2,350.0 kcal
- 5Protein per Serving= 20.00 g
- 6Carbohydrate per Serving= 50.00 g
- 7Fat per Serving= 13.33 g
Assumptions and limits
- The result is derived only from the 5 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 2 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.
- This is an approximate calculation for personal reference. Regulatory nutrition labelling requires verified ingredient data and prescribed rounding rules, and should not be based on this estimate.
How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.
This is an approximate calculation for personal reference. Regulatory nutrition labelling requires verified ingredient data and prescribed rounding rules, and should not be based on this estimate.
Frequently Asked Questions
How is Nutrition Label calculated?
Calories = protein × 4 + net carbohydrate × 4 + fibre × 2 + fat × 9 Fat carries more than twice the energy per gram of protein or carbohydrate, which is why it dominates calorie content. Fibre is counted at a reduced factor because it is only partially metabolised.
Why does Nutrition Label matter?
Dividing by servings is where label errors usually arise, since the serving count must match the portion size actually used.
What values do I need to enter?
This calculator takes 5 inputs: Total protein, Total carbohydrate, Total fat, Total fibre, Number of servings. The pre-filled defaults are a realistic starting point — replace them with figures from your own environment for a result you can act on.