Protein and Macros Explained: How to Set Your Targets

Q: How much protein do I need per day?

For active people and anyone losing weight, roughly 1.6 to 2.2 grams per kilogram of body weight per day works well. Sedentary adults need less, around 0.8 g/kg as a minimum for basic health.

Q: Do macros matter more than calories?

Calories decide whether you lose or gain weight. Macros, especially protein, shape what that weight is made of and how full and energetic you feel. Set calories first, then macros.

Last reviewed: 14 June 2026 · ~7 min read

"Macros" is just short for macronutrients — the three things in food that provide energy: protein, carbohydrate and fat. Calories tell you how much you're eating; macros tell you what those calories are made of. Getting the split roughly right is what separates losing fat while staying strong from simply losing weight and feeling drained. This guide explains what each macro does, how much protein you actually need, and how to turn your calorie target into macro targets without overcomplicating it.

The three macros, briefly

Protein (4 calories per gram) — the building block for muscle, skin, enzymes and hormones. It's the most filling macro and the one that protects muscle when you're dieting. This is the one most people under-eat.
Carbohydrate (4 calories per gram) — your body's preferred fuel, especially for hard training and brain function. Despite their reputation, carbs aren't fattening in themselves; excess total calories are.
Fat (9 calories per gram) — essential for hormones, absorbing certain vitamins, and cell health. It's calorie-dense, so small amounts add up quickly, but you need a baseline to stay healthy.

Notice fat carries more than double the calories per gram. That's not a reason to fear it — just why a "small" drizzle of oil or handful of nuts moves your totals more than the same weight of potato or chicken.

Why protein gets first priority

If you only get one macro right, make it protein. Three reasons:

It protects muscle. In a calorie deficit, adequate protein is the difference between losing fat and losing fat plus hard-won muscle. Muscle is what keeps you strong and your resting metabolism higher.
It keeps you full. Gram for gram, protein satisfies hunger better than carbs or fat, which makes a calorie deficit far easier to sustain.
It costs more to digest. Your body burns a bigger share of protein's calories just processing it, a small but real bonus.

A practical daily target for active people and anyone losing weight is about 1.6–2.2 g of protein per kilogram of body weight — lean toward the higher end if you're already lean or training hard. Sedentary adults need less, but almost everyone trying to change their body benefits from eating more protein than they currently do. The protein intake calculator sets a specific number for your weight and goal.

Setting the rest: carbs and fat

Once protein is locked in, the remaining calories get split between carbs and fat, and here you have real freedom — it's largely down to preference and performance. Some people feel best with more carbs to fuel training; others prefer more fat and fewer carbs. Neither is magic. A sensible default:

Set fat to roughly 0.8–1 g per kilogram of body weight as a healthy floor.
Fill the remaining calories with carbohydrate — the fuel for your workouts and daily energy.
Adjust from there based on how you feel, train and recover.

Rather than do this arithmetic by hand, the macro calculator takes your calorie target and goal and produces protein, carb and fat numbers in grams. Pair it with the calorie calculator so your macros always add up to the right total.

Calories first, macros second

It's worth being clear about the hierarchy, because it's easy to get lost chasing the "perfect" macro split. Total calories decide whether you lose or gain weight. You can hit your macros perfectly and still gain weight if the calorie total is too high. Macros — protein above all — decide what that weight change is made of and how good you feel while it happens. So the order is always: set calories for your goal, then divide them into macros. Get those two layers right and the finer details barely matter.

Quality still counts

Hitting your numbers with nothing but protein bars and white bread will technically work for weight change, but it's a poor way to feel and perform. Most of your protein from whole sources (poultry, fish, eggs, dairy, legumes, tofu), most of your carbs from fruit, vegetables, and whole grains, and most of your fat from nuts, seeds, olive oil and oily fish — that combination delivers fibre, vitamins and minerals alongside your macros. Track the macros, but don't let them blind you to food quality.

Frequently asked questions

How much protein do I need per day?

For active people and anyone losing weight, about 1.6–2.2 g per kilogram of body weight per day. Sedentary adults need less, around 0.8 g/kg as a minimum for basic health.

Are carbs bad for you?

No. Carbohydrates are your body's preferred fuel, especially for training. Quality and quantity matter more than the mere presence of carbs — whole-food sources are a sound default.

Do macros matter more than calories?

Calories decide whether you lose or gain. Macros, especially protein, shape what that weight is made of and how full you feel. Set calories first, then macros.

This article is general education, not medical or dietetic advice. Individual needs vary, especially with kidney conditions or pregnancy — check with a professional. See our Terms & Disclaimer.

Calculators used in this guide

Protein Intake Calculator — your daily protein target.
Macro Calculator — protein, carbs and fat in grams.
Calorie Calculator — the total your macros add up to.