How to Calculate Your Macros: Step-by-Step Guide (With Examples)
Renzy
May 21, 2026 · 8 min read
Quick answer
To calculate your macros: (1) set your calories (TDEE +/- depending on goal); (2) protein first: 1.6-2.2 g/kg (4 kcal/g); (3) fat: 0.6-1 g/kg, minimum 20% of calories (9 kcal/g); (4) carbohydrates: the remaining calories (4 kcal/g). Example for 70 kg in a deficit (1800 kcal): ~140 g protein, ~60 g fat, ~165 g carbs. Protein is the macro that matters most to get right; the rest is flexible.
Counting macros sounds technical, but it is simply dividing your calories among the three macronutrients — protein, carbohydrates and fat — in the way that best serves your goal. You do not have to do it forever or with lab precision: understanding the split helps you eat better even if you never weigh every gram. Here is the calculation step by step, with examples for fat loss and muscle gain.
Stop doing the math. Renzy does it for you.
Scan your food with a photo. Calories, macros and micronutrients in 3 seconds.
Calculating macros means splitting your calories among protein, carbohydrates and fat. Order matters: protein first (set by your weight), then fat (it has a minimum), and carbs get what is left. That simple.
The equivalences you need
Protein: 4 kcal per gram
Carbohydrates: 4 kcal per gram
Fat: 9 kcal per gram (more than double)
Alcohol (if you drink): 7 kcal per gram
Worked examples
Macro split by goal (person weighing 70 kg)
Goal
Calories
Protein
Fat
Carbohydrates
Lose fat
1800 kcal
140 g
60 g
165 g
Maintain
2100 kcal
130 g
70 g
215 g
Gain muscle
2400 kcal
140 g
70 g
290 g
Renzy calculates your macros automatically based on your weight and goal, and when you photograph your meals it tracks protein, carbs and fat for the day against those targets. No calculator or spreadsheet needed.
Scan your food with a photo. Calories, macros and micronutrients in 3 seconds.
Calculating your macros once gives you the map; tracking them for a while teaches you the terrain. Use Renzy to do both effortlessly and, once your eye is trained, you will be able to eat well almost on autopilot.
Renzy calculates all of this for you
Scan your food with a photo. Calories, macros and micronutrients in 3 seconds.
1Take-away: (1) set calories, then protein (1.6-2.2 g/kg), then fat (minimum 20%), and carbs get the rest; (2) getting protein right matters most; (3) counting macros for a while trains your eye — you do not have to do it forever.
Frequently asked questions
Which macro is most important to get right?▼
Protein, by far. It has the greatest effect on body composition (preserves or builds muscle) and on satiety, and it is the one most people fall short on. Fat has a safety minimum (do not go below 20% of calories) and carbohydrates are the most flexible: adjust their amount based on your energy levels and goal.
What is the best macro split?▼
There is no universal one. A common and effective split is around 30% protein / 40% carbs / 30% fat, but it varies with goal and preferences: those who train hard often raise carbs; some in a cut prefer more protein and fat. Set protein first (by weight) and fat (minimum), then distribute the rest as you prefer.
Do I have to count macros forever?▼
No. Counting macros for a while is very useful for learning how much protein your meals contain and training your eye. Many people do it for a few weeks or months and then eat intuitively with that foundation. It is a learning tool, not a life sentence.
How do I count the calories in each macro?▼
Protein: 4 kcal per gram. Carbohydrates: 4 kcal per gram. Fat: 9 kcal per gram (more than double). Alcohol if you drink: 7 kcal per gram. With these equivalences you can convert between grams and calories to balance your split.
Do I need an app to count macros?▼
Not essential, but it makes life much easier: calculating and adding up by hand is tedious and error-prone. An app that estimates macros from a photo reduces the error of eyeballing and automatically totals the day — where most people go wrong.
Nutritional information and health calculations in Renzy are for informational purposes only and are based on recognized scientific sources (USDA Food Database, ESPEN, WHO). They do not replace professional advice from a qualified doctor, nutritionist, or dietitian. Always consult a health professional before changing your diet or following medical recommendations.
