Macronutrient Calculator — Protein, Carbs & Fat (2025)
Get personalized daily macros (protein, carbs, fat) for your weight loss, muscle gain, or maintenance goals using the Mifflin-St Jeor formula.
Daily Macros — Maintenance
2693 cal
Daily Calorie Target
154g
Protein
351g
Carbohydrates
75g
Fat
1737 cal
BMR
Your BMR is 1737 cal. TDEE is 2693 cal. Target: 154g protein, 351g carbs, 75g fat.
Analysis & insights
Targeting 2,692.902 cal/day for your maintenance goal: 154.22128g protein (23%), 74.802845g fat (25%), 350.6979237500001g carbs (52%). Consider bumping protein toward 25-30% — it's the single most-impactful macro shift you can make for body composition.
Balanced macro split
Solid protein intake with room for healthy fats and carbs. Appropriate for most goals.
Risk & benchmark gauge
Current band
Adequate
Protein at 23% of calories
Industry benchmarks
- Your protein154.22128g (23%)
- Your fat74.802845g (25%)
- Your carbs350.6979237500001g (52%)
- Target protein25-35% of cal
- Target fat20-35% of cal
- Target carbs30-55% of cal
Key insights
Protein is the non-negotiable
Carbs and fats are flexible — what matters is total calories + adequate protein. Don't stress over precise carb/fat ratios; do hit your protein number daily.
Fiber matters separately
Macro calculators don't target fiber. Aim for 25-35g/day (mostly from vegetables, fruit, legumes, whole grains). Fiber improves satiety and gut health independently of macros.
Recommended actions(4)
Hit protein first, calories second, carbs/fat last
High priorityBuild each meal around a protein source. Calories handle weight direction; protein handles body composition.
Impact: High-protein dieters retain ~50% more lean mass during weight loss vs equal-calorie low-protein.
Spread protein across 3-4 meals
High priorityMuscle protein synthesis caps around 30-40g per meal. Hitting your daily target in one big serving wastes the rest.
Use whole-food sources first
Medium priorityChicken, beef, fish, eggs, greek yogurt, cottage cheese, beans, lentils. Protein powder for convenience, not as the foundation.
Related Calculators
This tool is for informational purposes only and does not constitute medical advice. Consult a healthcare professional for advice specific to your situation.
What is Macronutrient Targets?
Macronutrients are the three components of food that supply energy: protein, carbohydrate and fat. Total calories determine whether you gain or lose weight; the split between these three influences what that change is made of, how well you train, and how manageable the diet feels.
The evidence here is uneven, and it is worth being clear about which parts are solid. Protein intake has strong support for preserving lean mass during weight loss. The carbohydrate-to-fat ratio, by contrast, matters far less than the internet suggests — when calories and protein are held equal, outcomes across a wide range of splits are broadly similar.
That is genuinely useful news, because it means the ratio can be chosen for what you can sustain rather than optimised to a decimal point.
The formula — how to calculate Macronutrient Targets
- 4 kcal/g
- = energy density of protein and of carbohydrate
- 9 kcal/g
- = energy density of fat — more than double, which is why fat portions look small
- Percentages
- = must total 100%. Acceptable ranges are wide, which is the point.
Protein is often better set per kilogram of body weight rather than as a percentage, since the requirement tracks body mass rather than calorie intake. Percentages are then applied to the remainder.
Step-by-step example
- 01Target intake 2,000 calories, aiming to lose fat while preserving muscle, body weight 70 kg.
- 02Set protein first at 1.8 g per kg: 70 × 1.8 = 126 g.
- 03Protein calories: 126 × 4 = 504, leaving 1,496 calories for carbohydrate and fat.
- 04Set fat at about 25% of total intake: 2,000 × 0.25 = 500 calories ÷ 9 ≈ 56 g.
- 05Remaining calories go to carbohydrate: 1,496 − 500 = 996 ÷ 4 ≈ 249 g.
- 06Final targets: 126 g protein, 249 g carbohydrate, 56 g fat.
- 07As a percentage split that is roughly 25% protein, 50% carbohydrate, 25% fat — a conventional and well-tolerated distribution.
How much protein, and why it is the one that matters
Protein has the strongest evidence base of the three. During a calorie deficit it substantially reduces the proportion of weight lost as lean tissue, and it is the most satiating macronutrient per calorie, which makes restriction easier to adhere to.
The official minimum — the Recommended Dietary Allowance of 0.8 g per kg — is set to prevent deficiency in sedentary adults, not to optimise body composition. People training regularly or dieting generally do better well above it.
Protein intake by goal
| Situation | Grams per kg body weight | Rationale |
|---|---|---|
| Sedentary adult | 0.8 – 1.0 | RDA — prevents deficiency |
| General fitness | 1.2 – 1.6 | Supports recovery and training adaptation |
| Fat loss with training | 1.6 – 2.2 | Preserves lean mass in a deficit; highest satiety |
| Muscle gain | 1.6 – 2.2 | Supports tissue synthesis; more offers little added benefit |
| Older adults | 1.2 – 1.6 | Counters age-related muscle loss |
Intakes above roughly 2.2 g/kg show diminishing returns in most studies. Very high protein diets are not harmful in healthy people but displace other foods without added benefit.
Distribution matters less than total
Spreading protein across three or four meals is a reasonable default and may modestly help muscle protein synthesis, but hitting the daily total is far more important than the timing. Do not let a rule about meal spacing become a reason to miss the target.
Carbohydrate and fat: pick what you can sustain
Once calories and protein are set, the remaining split has a surprisingly small effect on body composition. Controlled comparisons of low-carbohydrate against low-fat diets, with calories and protein matched, generally find similar outcomes over time.
What does differ is how each feels and how each suits particular activities. Higher carbohydrate intakes support high-intensity and endurance training, where glycogen is the limiting fuel. Higher fat intakes suit some people's appetite regulation and preferences better.
Both have floors worth respecting. Fat should generally not fall below about 20% of intake, because it is required for absorbing fat-soluble vitamins and for hormone production. Carbohydrate has no strict dietary requirement, but very low intakes impair high-intensity performance and are harder for many people to maintain socially.
Acceptable Macronutrient Distribution Ranges (adults)
| Macronutrient | Range of total calories | Practical floor |
|---|---|---|
| Protein | 10 – 35% | Set by body weight, not percentage |
| Carbohydrate | 45 – 65% | No absolute requirement, but performance suffers when very low |
| Fat | 20 – 35% | Below ~20% risks fat-soluble vitamin and hormone issues |
AMDR ranges are from the Dietary Guidelines for Americans. They are deliberately wide because a wide band is genuinely acceptable.
Adjusting the split for your goal
- Fat loss —
- protein high at 1.6–2.2 g/kg for satiety and lean mass retention; carbohydrate and fat split by preference.
- Muscle gain —
- a modest calorie surplus of 250–350 above maintenance, protein 1.6–2.2 g/kg, carbohydrate generous to fuel training.
- Endurance training —
- carbohydrate toward the upper end of the range, since glycogen availability limits sustained output.
- Maintenance —
- anywhere within the AMDR bands that you can hold indefinitely without effort.
Precision beyond adherence is wasted
Hitting macros within about 5–10 g of target is more than adequate. Food labels carry permitted margins of error, portion estimation is imprecise, and daily requirements fluctuate anyway. Chasing exact numbers adds stress without adding results — and for some people it becomes an unhealthy relationship with food.
Key considerations
- Set protein first from body weight, then divide the remaining calories between carbohydrate and fat.
- Total calories still determine weight change; the macro split shapes composition and adherence.
- Keep fat at or above roughly 20% of intake for hormone production and vitamin absorption.
- Weigh food for the first couple of weeks to calibrate your eye, then estimate.
- Fibre is not a separate macro but matters — roughly 14 g per 1,000 calories is a common target.
- Alcohol supplies 7 kcal/g and fits none of the three categories; count it against carbohydrate or fat.
- If tracking becomes preoccupying or distressing, step back to simpler guidance and speak to a professional.
Common mistakes to avoid
- Obsessing over the carbohydrate-to-fat ratio, which matters far less than calories and protein.
- Setting protein as a percentage of calories rather than from body weight, which under-supplies it in a deficit.
- Cutting fat below 20% of intake and impairing hormone production and vitamin absorption.
- Treating macro targets as exact rather than approximate.
- Forgetting alcohol, which carries substantial calories outside the three macros.
- Neglecting fibre and micronutrients while hitting macro targets precisely.
- Choosing a split you cannot sustain socially or practically, then abandoning the plan entirely.
Frequently asked questions
Sources & references
Written and fact-checked by the CalcProLabs Editorial Team against Dietary Guidelines for Americans AMDR ranges. Read our calculation methodology and editorial policy.
Last updated