Protein Calculator – How Much Protein Do You Need?

What Is a Protein Intake Calculator?

A protein intake calculator is a free tool that tells you exactly how many grams of protein you should eat each day — based on your bodyweight, activity level, and personal goal, whether that’s losing fat, building muscle, or simply supporting general health.

Unlike generic advice like “eat more protein,” this calculator gives you a specific, personalised number so you know exactly what to aim for.

Use the free protein intake calculator above to get your daily target in seconds.

How Much Protein Should I Eat Per Day?

This is one of the most searched nutrition questions — and unlike calories, protein needs don’t vary as wildly from person to person. They mainly come down to three things: your bodyweight, your goal, and how active you are.

Government dietary guidelines set the baseline RDA (Recommended Dietary Allowance) for protein at just 0.8g per kg of bodyweight — but that figure is the minimum to prevent deficiency, not the amount needed to build muscle, lose fat while preserving lean mass, or support an active lifestyle. Most people training regularly need meaningfully more than the RDA.

Factors that determine your daily protein needs:

• Bodyweight — the single biggest factor; protein needs scale with body mass
• Goal — building muscle requires more protein than general maintenance
• Activity level — the more you train, the more protein your muscles need to recover
• Age — protein needs increase slightly with age to help prevent muscle loss (sarcopenia)
• Current diet quality — whether you’re already eating adequate protein or starting from a low baseline

Why Protein Matters More Than Any Other Macro

Of the three macronutrients — protein, carbohydrates, and fats — protein plays the most direct role in body composition. It’s the only macro your body cannot efficiently store, meaning consistent daily intake matters far more than with carbs or fats.

What protein actually does in your body:

• Builds and repairs muscle tissue — especially critical after resistance training
• Preserves lean muscle during weight loss — without enough protein, a calorie deficit burns muscle along with fat
• Keeps you full longer — protein has the highest satiety effect of any macro, making it easier to stick to a calorie target
• Has the highest thermic effect — your body burns more calories digesting protein than carbs or fat
• Supports hormone and enzyme production — beyond muscle, protein is a building block for much of your body’s chemistry

Recommended Protein Intake by Goal

Protein for General Health

If your goal is simply staying healthy without a specific performance or physique target, 0.8–1.2g of protein per kg of bodyweight is a solid range. This comfortably covers the RDA while supporting normal muscle maintenance for a mostly sedentary lifestyle.

Protein for Weight Loss

When you’re in a calorie deficit, protein needs actually go up, not down. Research consistently shows that a higher protein intake during weight loss helps preserve lean muscle mass while the deficit does its job on body fat.

Recommended: 1.6–2.2g per kg of bodyweight. This range is well supported in sports nutrition research as the sweet spot for muscle preservation during a cut, without meaningful additional benefit above roughly 2.2g/kg for most people.

Protein for Muscle Gain

Building new muscle tissue requires more raw material than simply maintaining what you already have.

Recommended: 1.8–2.5g per kg of bodyweight. Combined with a calorie surplus and progressive resistance training, this range gives your body what it needs for muscle protein synthesis without wasted excess.

Protein for Athletic Performance & Maintenance

For people training consistently but not specifically bulking or cutting — general athletes, endurance trainees, or anyone maintaining an active lifestyle — 1.4–1.8g per kg of bodyweight balances recovery needs with a sustainable, easy-to-hit daily target.

How to Use Your Protein Results

Step 1 — Use the calculator above. Enter your weight, activity level, and goal to get your personalised daily gram target instantly.

Step 2 — Spread it across your meals. Aim to hit roughly a quarter of your daily target at each of 3–4 meals. Spreading protein intake throughout the day supports muscle protein synthesis better than front- or back-loading it into one or two meals.

Step 3 — Prioritise protein first when planning meals. Build each meal around a protein source, then fill in carbs and fats around it — this makes it far easier to consistently hit your number.

Step 4 — Track for 1–2 weeks. Use a free app like MyFitnessPal or Cronometer to check how your current intake compares to your target. Most people are surprised by how far under they actually are.

Step 5 — Recalculate as your weight changes. Since protein needs scale with bodyweight, your target should shift as you lose or gain weight — recalculate every few weeks, same as you would with your calorie and macro targets.

How to Calculate Your Protein Intake Manually

If you’d rather work out your protein target by hand instead of using the calculator above, the formula is simple:

Protein target (g/day) = Bodyweight (kg) × g/kg range for your goal

Use the ranges below based on your goal — the same ones the calculator uses:

Worked Example

A 70kg person aiming for weight loss needs:

70 × 1.6 = 112g (low end) 70 × 2.2 = 154g (high end)

Target range: 112–154g of protein per day.

If you’re working in pounds instead of kilograms, convert your weight first (divide lbs by 2.2 to get kg), then apply the same formula. For example, a 154 lb person is 70kg — so the same 112–154g range applies.

This manual method gives you the same result as the calculator above — use whichever is faster for you, or the calculator if you want your exact number instantly without doing the math yourself.

Best Protein Sources to Hit Your Target

• Animal sources: chicken breast, turkey, lean beef, eggs, whey protein, Greek yoghurt, cottage cheese, fish
• Plant sources: tofu, tempeh, lentils, chickpeas, edamame, seitan, plant-based protein powders, quinoa

A useful rule of thumb: most animal proteins provide roughly 20–30g of protein per 100g serving, while plant sources vary more widely — so plant-based eaters may need to be more deliberate about combining sources to hit their daily target.

Common Mistakes When Tracking Protein Intake

Underestimating serving sizes. A “chicken breast” at a restaurant is often 200–300g, not the 100g serving most nutrition labels reference — leading people to under-log protein without realising it.

Only eating protein at dinner. Many people default to a protein-heavy dinner and protein-light breakfast and lunch. Spreading intake evenly across the day supports muscle repair far better than one large dose.

Not adjusting after weight loss or gain. As your bodyweight changes, so does your target — a protein goal set for your starting weight can become inaccurate a few months in.

Assuming more is always better. Beyond roughly 2.2–2.5g/kg, additional protein generally doesn’t provide extra muscle-building benefit for most people and simply displaces calories that could go toward carbs or fats.

Frequently Asked Questions

Is too much protein bad for you?

For most healthy adults, higher protein intakes within the ranges above are well tolerated. Concerns about protein harming healthy kidneys are not well supported by current research in people without pre-existing kidney disease. Those with kidney conditions should follow medical guidance on protein intake specifically.

Can I hit my protein target from plant sources alone?

Yes. A well-planned plant-based diet combining varied sources — legumes, tofu, tempeh, seitan, and plant protein powders — can meet even higher protein targets, though it often requires more deliberate meal planning than an omnivorous diet.

Do I need more protein on rest days?

Muscle repair continues on rest days, so keeping protein intake consistent every day — not just on training days — supports recovery and muscle maintenance better than cycling it.

What’s the difference between protein and calorie/macro calculators?

A calorie and macro calculator gives you your full daily energy and macro breakdown across protein, carbs, and fat. This protein intake calculator focuses specifically on your protein target, useful if you already track calories but want a sharper, standalone protein number to prioritise.

How much protein per meal is optimal?

Most research points to roughly 0.3–0.4g per kg of bodyweight per meal, spread across 3–4 meals, as an effective way to maximise muscle protein synthesis throughout the day.

Should athletes eat more protein than the calculator suggests?

The “Athletic Performance” range (1.4–1.8g/kg) already accounts for regular training. Endurance athletes in very high-volume training blocks may sit toward the top of this range or slightly above it — but going much beyond 2g/kg rarely adds further benefit.

How do I calculate my protein intake?

Multiply your bodyweight in kilograms by the gram-per-kg range that matches your goal — for example, 1.6–2.2g/kg for weight loss, or 1.8–2.5g/kg for muscle gain. A 70kg person aiming to lose weight would need roughly 112–154g of protein per day. See the full formula and worked example above, or use the calculator at the top of this page for an instant personalised number.

How much protein should I eat per day?

It depends on your goal and bodyweight, but as a general range, most people need between 0.8g/kg (general health) and 2.5g/kg (muscle building) of bodyweight per day. Use the calculator above for a number tailored to your specific weight, activity level, and goal.

Related Tools on This Site

• Calorie & Macro Calculator — get your full daily calorie and macro breakdown, including protein, carbs, and fats
• BMI Calculator — find out if your current weight is in a healthy range for your height
• One Rep Max Calculator — calculate your strength levels and plan your lifting programme

The information on this page is for educational purposes only and does not constitute medical or nutritional advice. Please consult a registered dietitian or healthcare professional before making significant changes to your diet.