How the Calculation Works
This calculator applies a per-kilogram protein multiplier that scales with your goal: 1.6g/kg for general fitness, 2.0g/kg for building muscle, and 2.2g/kg for cutting, where higher protein helps preserve muscle in a calorie deficit. These ranges reflect the upper end of what current research supports for people who train, not sedentary population averages.
Protein Target by Goal (g/kg)
The right protein target depends on your goal and training status, not just your bodyweight. These ranges reflect the upper end of what current research supports for people who train, not sedentary population averages. Bodyweight alone is a rough guide too: someone carrying more body fat generally needs less protein per kilogram of total weight than a lean, heavily muscled person, since protein needs track with lean mass more closely than total scale weight.
If you're unsure which row applies to you, start with the "Building muscle" range. It comfortably covers general fitness goals too, and it's easier to eat slightly more protein than needed than to correct a shortfall that's been slowing your progress for weeks without you noticing.
| Goal | Range | Note |
|---|---|---|
| General fitness / maintenance | 1.2 to 1.6g/kg | Enough to maintain muscle for lightly active, non-training adults. |
| Building muscle | 1.6 to 2.2g/kg | The range consistently supported by hypertrophy research for lifters in a calorie surplus or at maintenance. |
| Cutting fat (preserve muscle) | 2.0 to 2.4g/kg | Higher end protects muscle mass while eating in a calorie deficit. |
| Older adults (50+) | 1.2 to 1.6g/kg minimum | Muscle protein synthesis becomes less efficient with age, so the floor is higher even without a training goal. |
Protein Timing and Distribution
Total daily protein matters most, but how you spread it across the day affects how efficiently your body uses it. Muscle protein synthesis responds best to roughly 0.3 to 0.4g/kg of protein per meal, spread across 3 to 4 meals, rather than the same total eaten in one or two large sittings.
A protein-rich meal within a few hours of training is useful but not magic: the "anabolic window" is wider than older advice suggested, closer to several hours than a strict 30-minute cutoff. Consistency across the whole day matters far more than precise timing around a single workout.
Before bed is another useful anchor point. A slower-digesting protein source, such as cottage cheese or a casein-based shake, in the hour or two before sleep can support muscle repair overnight, though the effect is modest next to simply hitting your total daily target consistently, day after day.
Protein Per Food: Quick Reference
Use this table to build meals that hit your daily target without tracking every gram by hand. Animal sources like chicken, fish, eggs, and dairy are "complete" proteins, containing all nine essential amino acids in ratios your body uses efficiently. Plant sources like lentils and tofu are still valuable and can fully meet your target, but combining a few different plant sources across the day covers the amino acid profile more completely than relying on just one.
| Food | Protein |
|---|---|
| Chicken breast, cooked | 31g per 100g |
| Salmon, cooked | 25g per 100g |
| Eggs | 6g per large egg |
| Greek yogurt | 10g per 100g |
| Cottage cheese | 11g per 100g |
| Lentils, cooked | 9g per 100g |
| Tofu, firm | 12g per 100g |
| Whey protein powder | 20-25g per scoop |
Spreading protein across 3 to 5 meals, each with at least 0.3g/kg, makes hitting your daily number far easier than trying to eat it all at once. Lean meat, fish, eggs, dairy, and legumes are the most practical sources. If you're also tracking total calories, pair this with our TDEE calculator to set a complete nutrition target, and see the macros glossary entry for how protein fits alongside carbs and fat.
Protein alone doesn't build muscle, training does. The two work together: enough protein supplies the raw material for repair, while progressive resistance training on a structured program is what actually signals your body to use it for growth rather than other functions. See our gym workout plan for beginners or dumbbell only workout plan for a program to pair with this target, and track your lifts alongside it with our one-rep max calculator.
Frequently Asked Questions
- How much protein do I need per day?
- Most people training for muscle or strength need 1.6 to 2.2g of protein per kg of bodyweight (about 0.7 to 1.0g per lb). Higher end of that range if you're in a calorie deficit, to protect muscle while losing fat.
- Do I need more protein when cutting calories?
- Yes. Research consistently shows higher protein intakes (closer to 2.2g/kg) preserve more muscle during a calorie deficit than lower intakes. Protein also has the highest satiety of any macronutrient, which helps with hunger while dieting.
- Can I eat too much protein?
- For healthy adults, intakes up to around 3.5g/kg show no adverse effects in research. Beyond your target, extra protein mostly displaces carbs or fat you'd otherwise eat, it doesn't build additional muscle past what your training and total calories support.
- Should I spread protein evenly across meals?
- It helps. Aiming for roughly 0.3 to 0.4g/kg of protein per meal, across 3 to 4 meals, maximizes muscle protein synthesis better than eating most of it in one sitting, though total daily intake still matters most.
- What's a good protein intake calculator for beginners?
- A good protein calculator for beginners is one that scales the target to your goal rather than giving a single flat number. This calculator uses 1.6g/kg for general fitness, 2.0g/kg for building muscle, and 2.2g/kg for cutting, which covers the full range beginners typically need without requiring you to research the studies yourself.