Macro Calculator
Macro Calculation Settings
Split an established daily calorie target into carbs, protein, and fat, then review daily and per-meal amounts.
Quick presets
Macro Calculator Result
Calculate by ratio · Muscle gain
Carbs
225 g
900 kcal · 45%
56.3 g / meal
Protein
150 g
600 kcal · 30%
37.5 g / meal
Fat
55.6 g
500 kcal · 25%
13.9 g / meal
Macro ratio chart
Total macro calories: 2,000 kcal
Difference from target: 0 kcal
Meals per day: 4
Calculation note
This calculator estimates macro targets from daily calories and carbohydrate, protein, and fat ratios. Appropriate macro targets can vary by health status, medical conditions, activity level, pregnancy, breastfeeding, growth needs, eating disorder history, and dietary restrictions from a clinician. Consult a qualified professional if you have special health needs.
Macro calculation basics
Usage Tips
Set daily calories first, then divide macros across your meals
Once your calorie target is established, use a preset as a starting point and compare daily carbohydrate, protein, and fat targets with the per-meal amounts. The result is a meal-planning reference, and qualified guidance should take priority for special health needs.
What is Macro Calculator?
The Macro Calculator is a meal-planning aid that distributes an already established daily calorie target across carbohydrate, protein, and fat. It supports percentage splits, protein grams per kilogram, and direct-gram checking, then displays grams, calories, percentages, and equal per-meal amounts. It does not calculate BMR, TDEE, calorie deficits, or weight-loss timelines, and its results are references rather than individualized diet prescriptions.
How to Use
- 1Enter an established daily calorie target and the number of meals per day.
- 2Choose percentage split, protein g/kg, or direct gram checking.
- 3In percentage mode, enter ratios that total 100% or select a preset.
- 4In protein g/kg mode, enter body weight, protein factor, and fat percentage so remaining calories can be assigned to carbs.
- 5Review daily grams, macro calories, target difference, ratio bar, and per-meal amounts.
Reference Knowledge
- ●Carbohydrate and protein are calculated at 4 kcal per gram, while fat is calculated at 9 kcal per gram.
- ●Percentage mode multiplies daily calories by each ratio, then divides those calories by the appropriate calorie-per-gram value.
- ●Protein g/kg mode fixes protein as body weight × protein factor, subtracts protein and fat calories, and assigns the remainder to carbohydrate.
- ●Direct gram mode totals calories from all three entered gram values and compares that total with the calorie target.
- ●Per-meal amounts simply divide each daily gram target equally by the selected number of meals.
- ●Food labels can differ slightly from the 4-4-9 calculation because of rounding, fiber, sugar alcohols, and labeling rules.
FAQ
Q.How do I convert a macro percentage into grams?
Multiply daily calories by each macro percentage to get carbohydrate, protein, and fat calories. Divide carbohydrate and protein calories by 4 and fat calories by 9. At 2,000 kcal with a 45-30-25 split, the result is 225 g carbs, 150 g protein, and about 55.6 g fat.
Q.How is protein g/kg mode different from percentage mode?
Percentage mode directly sets the calorie share of all three macros. Protein g/kg mode fixes protein first from body weight and a selected factor, applies the chosen fat percentage, and assigns the remaining calories to carbohydrate. It is useful when protein has a specific training-related target.
Q.Do the percentages have to total exactly 100%?
Yes in percentage mode. The three macros are intended to allocate the entire daily calorie target. A lower total leaves calories unassigned, while a higher total exceeds the target, so the calculator asks you to correct the split.
Q.Why can direct macro calories differ from a nutrition label?
This calculator uses the general 4 kcal per gram for carbs and protein and 9 kcal per gram for fat. Nutrition labels may use rounding and account differently for fiber, sugar alcohols, organic acids, or local labeling regulations.
Q.Should I follow the calculated macros as a medical diet?
No. The result is a general planning reference for dividing an existing calorie target. Medical conditions, pregnancy, breastfeeding, growth, eating disorder history, intensive training, or clinician-directed restrictions require individualized guidance from a qualified professional.
