Macro Calculator

Use our free macro calculator to find your ideal daily protein, carbs, and fat in seconds. Pick your goal and diet style, from balanced to keto, and get your macros in grams, as percentages, and split per meal.

Calculate Your Macros

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What Are Macros?

Macros is short for macronutrients: the three nutrient groups that supply almost all of your calories. Protein and carbohydrates each deliver about 4 calories per gram, while fat delivers about 9. Alcohol is technically a fourth macronutrient at 7 calories per gram, but it has no useful place in a macro plan, so this macro calculator leaves it out.

Calories decide whether you lose, maintain, or gain weight. Macros decide what that weight is made of. Two people can eat 2,000 calories a day and get very different results: the one hitting smart protein, carb, and fat targets keeps more muscle and feels fuller, while the other slowly loses lean mass. Protein protects muscle and drives satiety, fat supports hormones and vitamin absorption, and carbohydrates fuel training and everyday activity. Tracking macros, not just calories, is what turns a diet into a plan.

How This Macro Calculator Works

This macro calculator builds your daily targets in seven steps, from your basal metabolic rate up to per-meal portions:

  1. Estimates your BMR with the Mifflin-St Jeor equation from your age, gender, height, and weight.
  2. Multiplies by your activity level to get TDEE, your total daily energy expenditure.
  3. Adjusts for your goal: minus 500 kcal to lose weight, plus 300 kcal to gain muscle, unchanged to maintain.
  4. Sets protein from body weight using your diet style, with an extra 0.2 g per kg when losing weight to protect muscle in a deficit.
  5. Sets fat as a share of calories, from 25 percent on high-protein up to 70 percent on keto.
  6. Fills the remaining calories with carbohydrates, then divides every macro by your number of meals.
  7. Adds a fiber target of 14 g per 1,000 calories for fullness and gut health.

Macro Splits by Diet Style

Each diet style in this macro calculator changes two levers: protein per kilogram of body weight and fat as a share of calories. Carbs always fill the remaining calories, which is why keto lands very low carb while balanced lands moderate. Choose the style that matches how you actually like to eat, because the best macro split is the one you can follow for months.

Diet styleProteinFatCarbs
Balanced1.8 g per kg30% of caloriesRemainder
High-protein2.2 g per kg25% of caloriesRemainder
Low-carb2.0 g per kg45% of caloriesRemainder
Keto1.6 g per kg70% of caloriesRemainder (usually 20 to 50 g)

How Much Protein, Carbs, and Fat Do You Need?

Protein: the anchor of your split. Active adults do well on 1.6 to 2.2 g per kg of body weight per day. If you are losing weight, aim higher, around 2.0 to 2.4 g per kg, because protein protects muscle in a deficit and keeps hunger down. Set protein first, then build the rest of your macros around it.

Fat: keep it at 25 to 35 percent of calories for most goals. Fat supports testosterone, estrogen, and the absorption of vitamins A, D, E, and K. Staying below about 0.5 g per kg for long stretches is rarely worth it. Keto is the deliberate exception, pushing fat to about 70 percent of calories.

Carbs: whatever calories remain after protein and fat. Carbs are your training fuel and the easiest lever to adjust: trim them to deepen a deficit, raise them to fuel hard sessions. There is no essential minimum for most people, but very low carb diets need planning to cover fiber and micronutrients.

Meal timing: total daily protein matters most, but spreading it across evenly spaced protein feedings of 20 to 40 g every 3 to 4 hours is linked to better muscle protein synthesis in the ISSN position stand on nutrient timing. That is exactly what the per-meal splits from the macro calculator above give you.

Worked Example

Take a 30-year-old man, 175 cm, 75 kg, moderately active, maintaining weight on a balanced diet with 4 meals a day. Here is the full chain of math:

  • BMR (Mifflin-St Jeor): (10 x 75) + (6.25 x 175) – (5 x 30) + 5 = 1,699 kcal
  • TDEE: 1,699 x 1.55 = 2,633 kcal daily target
  • Protein: 1.8 x 75 = 135 g (540 kcal, about 21 percent)
  • Fat: 30 percent of 2,633 / 9 = 88 g (792 kcal, about 30 percent)
  • Carbs: (2,633 – 540 – 792) / 4 = 325 g (1,300 kcal, about 49 percent)
  • Fiber: 14 x 2,633 / 1,000 = 37 g
  • Per meal across 4 meals: 34 g protein, 22 g fat, 81 g carbs

How to Actually Hit Your Macros

Knowing your macros and hitting them are different skills. These habits close the gap:

  • Weigh your food with a kitchen scale for the first two weeks. Most people underestimate portions by 20 to 50 percent when they eyeball them.
  • Build every meal around protein first, then add carbs and fat to fill your remaining numbers.
  • Pre-log the day in the morning or the night before, so each meal has a job before you get hungry.
  • Keep two or three go-to meals that already fit your split and rotate them through the week.
  • Aim to land protein and calories within about 10 percent. Small carb and fat swaps barely matter when those two are right.
  • Eat your fiber target and drink plenty of water. Both make any deficit dramatically more livable.

Common Macro Problems (And How to Fix Them)

If your macro calculator results look right on paper but progress has stalled, one of these five problems is usually behind it.

  1. Your macros say one thing but the scale says another. Hidden calories are the usual culprit: cooking oil adds about 120 kcal per tablespoon, plus sauces, drinks, tastes while cooking, and untracked weekends. Fix it with a kitchen scale and fully honest tracking for two weeks before you change your targets.
  2. Your protein is set too low. Set protein FIRST, from body weight, at 1.6 to 2.2 g per kg. This macro calculator already does that for you.
  3. You never updated your numbers. As your weight changes, your targets drift with it. Recalculate every 2 to 4 weeks or after every 5 to 10 lb change.
  4. You copied someone else’s macros. Macros are personal: they depend on your size, activity level, and goal, so a plan built for a 90 kg lifter will not fit a 60 kg runner.
  5. Your grams and calories do not add up exactly. The 4-4-9 calorie values are rounded averages, so a small mismatch between grams and total calories is completely normal.

What To Do With Your Macros

Your macro targets work best with a calorie plan behind them. Find your maintenance calories with the calorie calculator, fine-tune protein with the protein intake calculator, and set a safe deficit with the calorie deficit calculator. Then come back to this macro calculator and turn that calorie target into a full daily split.

Frequently Asked Questions

What should my macros be?

A balanced starting point is about 20-25% protein, 25-30% fat and 45-50% carbs, but the best split depends on your goal. Fat loss favors higher protein (2.0-2.4 g/kg), muscle gain a slight surplus with 1.6-2.2 g/kg protein, and maintenance sits between. The calculator above personalizes it for you.

How many grams of protein do I need per day?

Active adults need 1.6-2.2 g per kg of body weight; dieters in a deficit do best at 2.0-2.4 g/kg. A 75 kg person therefore needs roughly 135-165 g daily.

What is a good macro split for weight loss?

Keep protein high (2.0-2.4 g/kg) to protect muscle, fat at 25-35% of calories for hormones, and fill the rest with carbs. The high-protein preset in this calculator uses exactly this structure.

What is a good macro split for muscle gain?

Eat a 200-300 kcal surplus, keep protein at 1.6-2.2 g/kg, fat at 25-30%, and let carbs fuel your training. Most of the surplus should land in carbs.

How do I calculate macros for keto?

Set fat to about 70% of calories, protein to 1.6 g/kg, and carbs to the small remainder (usually 20-50 g). The keto preset in this calculator applies this automatically.

Should I track macros or just calories?

Calories decide whether you lose, maintain or gain weight; macros decide what that weight is. Track both for best results, but if calories and protein are right, small carb-fat misses barely matter.

How many meals should I split my macros into?

3 to 5 meals all work. What matters is total daily protein, spaced roughly every 3-4 hours (20-40 g per meal), which research links to better muscle protein synthesis.

What about fiber?

Aim for 14 g per 1,000 calories. Fiber improves fullness and gut health and is the most overlooked part of a macro plan.

Why do my macros say one thing but the scale says another?

Usually under-tracking: cooking oil, sauces, drinks, tastes while cooking, and untracked weekends add hundreds of hidden calories. Weigh food for two weeks with a kitchen scale before changing your targets – daily weight fluctuates from water and sodium, not fat.

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