Protein Intake Calculator
What Is a Protein Intake Calculator?
Protein is the building material of your body: it repairs muscle after training, keeps skin, hair and nails healthy, supports your immune system and helps you feel full after meals. Yet how much protein you actually need is not a single fixed number — it depends on your body weight, how active you are and what you are trying to achieve. A protein intake calculator turns those personal details into a clear daily target in grams, so you can stop guessing and start planning your meals with confidence.
This tool is for gym-goers working towards more muscle, people losing weight who want to protect the muscle they already have, runners and endurance athletes recovering from long sessions, older adults aiming to stay strong and independent, and anyone who simply wants a healthier, more balanced diet. The ranges it uses come from widely cited sports-nutrition and public-health guidance, expressed as grams of protein per kilogram of body weight per day — the standard way researchers and dietitians frame protein needs.
How to Use This Protein Intake Calculator
- Choose your units. Tap Metric to enter your weight in kilograms, or Imperial for pounds.
- Enter your body weight. Weigh yourself in the morning before breakfast for the most consistent figure, and enter your current weight rather than a target weight.
- Pick your goal. Choose general health, building muscle, losing weight, endurance training, or staying strong after age 50 — each goal uses a different evidence-based range.
- Click Calculate My Protein Needs. You will see your daily target range, a midpoint to aim for, and how that splits across three or four meals.
- Plan your meals around the midpoint. Use the per-meal figures to build each plate: a palm-sized portion of meat, fish, eggs, lentils or dairy at every meal gets most people most of the way there.
Worked Example: 70 kg, Building Muscle
Take a 70 kg person who lifts weights regularly and wants to build muscle. The evidence-based range for muscle gain is 1.6 to 2.2 grams per kilogram per day:
- Lower end: 70 × 1.6 = 112 g per day
- Upper end: 70 × 2.2 = 154 g per day
- Midpoint to aim for: (112 + 154) ÷ 2 = 133 g per day
- Per meal, over 3 meals: 133 ÷ 3 = about 44 g per meal
- In ounces: 133 ÷ 28.35 = about 4.7 oz of protein per day
In everyday food terms, 133 g of protein is roughly a chicken breast at lunch, two eggs and Greek yoghurt at breakfast, and a portion of fish or lentils at dinner, plus a glass of milk. You do not need supplements to reach it — ordinary food does the job — but a protein shake can be a convenient way to fill a gap on busy days. Try your own weight and goal in the tool above.
Protein Needs by Goal
| Goal | Grams per kg per day | 70 kg person |
|---|---|---|
| General health / maintain | 0.8 – 1.0 | 56 – 70 g |
| Build muscle / strength training | 1.6 – 2.2 | 112 – 154 g |
| Lose weight / keep muscle | 1.6 – 2.0 | 112 – 140 g |
| Endurance training | 1.2 – 1.6 | 84 – 112 g |
| Age 50 plus / stay strong | 1.0 – 1.2 | 70 – 84 g |
Tips for Hitting Your Protein Target
- Spread it across the day. Your body uses protein best when each meal contains 25–45 g, rather than eating almost none at breakfast and a huge amount at dinner.
- Anchor every meal with a protein source. Eggs, yoghurt, lentils, chickpeas, fish, chicken, tofu or cheese — pick one per meal and the total largely takes care of itself.
- Do not forget plant proteins. Lentils, beans, soya and quinoa are excellent, affordable sources; combining different plant foods across the day covers all the essential amino acids.
- Drink enough water. Higher protein intakes work best alongside good hydration, especially if you train hard or live in a hot climate.
- Be patient with change. Muscle gain and fat loss are measured in weeks and months; hit your target most days and the results will follow.
Frequently Asked Questions
How much protein do I need per day?
It depends on your weight and goal. The basic recommendation for sedentary adults is 0.8 g per kilogram per day, while people building muscle need 1.6–2.2 g per kilogram. Enter your weight and goal in the calculator above for your personal range.
Can I eat too much protein?
For healthy adults, intakes up to about 2.2 g per kilogram per day show no harm in research studies. Very high intakes beyond that offer little extra benefit and can crowd out other foods. People with kidney or liver conditions should keep to the level their clinician advises.
Do I need protein powder to reach my target?
No. Powder is convenient, not essential. Eggs, dairy, meat, fish, lentils and beans all supply plenty of protein. A shake is simply an easy way to add 20–25 g on days when cooking a full meal is impractical.
Should I eat protein straight after exercise?
The old idea of a strict 30-minute window is overstated. What matters most is your total daily intake and spreading it across meals. Having 25–45 g of protein within a couple of hours of training is sensible, but you will not lose your gains if dinner comes a little later.
Is plant protein as good as animal protein?
Yes, when your diet is varied. Individual plant foods may be low in one amino acid, but eating a mix of lentils, beans, grains, nuts and soya across the day provides everything you need. Vegans should simply aim towards the upper end of their range and vary their sources.