🍗 Protein Calculator: Daily Protein Intake by Goal
By Shihab Mia · Reviewed by ToolNimba Review Team, Health content reviewed for accuracy · Updated 2026-06-26
This calculator gives a general estimate for healthy adults and is not professional medical or dietary advice. Talk to a doctor or registered dietitian before making changes, especially if you have kidney disease, diabetes or other health conditions.
This protein calculator estimates how many grams of protein you should eat each day based on your body weight and your training or weight goal. It uses grams of protein per kilogram of body weight, the same approach used in sports nutrition and clinical guidelines, and shows a sensible low-to-high range rather than a single rigid number. You also get a per-meal target and the calories that protein provides, so you can plan real meals.
What is the Protein Intake Calculator?
Protein is the macronutrient your body uses to build and repair muscle, make enzymes and hormones, support your immune system and keep you feeling full. Unlike fat, the body has no large store of spare protein, so a steady daily intake matters. The most reliable way to set a target is to scale protein to your body weight in grams per kilogram, because a 55 kg person and a 95 kg person have very different needs.
The baseline for a sedentary adult is about 0.8 grams per kilogram, the level set to prevent deficiency in the general population. That figure is a floor, not an optimum. People who train, who are trying to lose fat while keeping muscle, or who are older and fighting age-related muscle loss generally do better with more. Active and recreational exercisers sit around 1.2 to 1.4 g/kg, endurance athletes around 1.2 to 1.6 g/kg, and those focused on building muscle or strength often aim for 1.6 to 2.2 g/kg.
Weight loss is a special case. When you eat in a calorie deficit, higher protein, roughly 1.6 to 2.0 g/kg, helps protect lean muscle and curbs hunger, so you lose more fat and less muscle. This calculator builds those ranges in for you and reports a midpoint as a practical daily target.
Spreading protein across the day helps too. Research suggests muscle protein synthesis responds best to several moderate doses, often 20 to 40 grams, rather than one huge serving. That is why the tool divides your daily target across the number of meals you choose, defaulting to four, so you can see a realistic per-meal amount to aim for.
When to use it
- Setting a daily protein target before starting a muscle-building or strength program.
- Protecting lean muscle while cutting calories on a fat-loss diet.
- Planning how much protein to put on each plate when you eat three, four or five meals a day.
- Checking whether an older adult or recreational athlete is eating enough protein for recovery.
How to use the Protein Intake Calculator
- Enter your body weight and pick kg or lb (the tool converts pounds to kilograms for you).
- Choose the goal or activity level that best matches you, from sedentary to strength and muscle gain.
- Set how many meals you eat per day (the default is 4) to see a per-meal target.
- Read your daily protein target, the suggested range, the per-meal split and the calories from that protein.
Formula & method
Worked examples
An 80 kg recreational lifter who wants to build muscle, eating 4 meals a day.
- Goal is strength / muscle gain, so use 1.6 to 2.2 g/kg with a 1.8 midpoint.
- Target = 80 kg x 1.8 = 144 g/day.
- Range = 80 x 1.6 to 80 x 2.2 = 128 to 176 g/day.
- Per meal at the target = 144 / 4 = 36 g.
- Calories from protein = 144 x 4 = 576 kcal/day.
Result: About 144 g/day (range 128 to 176 g), roughly 36 g per meal and 576 kcal from protein.
A 160 lb adult in a fat-loss phase, eating 3 meals a day.
- Convert weight: 160 lb x 0.453592 = 72.6 kg.
- Goal is weight loss, so use 1.6 to 2.0 g/kg with a 1.6 midpoint.
- Target = 72.6 x 1.6 = about 116 g/day.
- Range = 72.6 x 1.6 to 72.6 x 2.0 = about 116 to 145 g/day.
- Per meal at the target = 116 / 3 = about 39 g.
Result: About 116 g/day (range 116 to 145 g), roughly 39 g per meal.
Protein needs in grams per kilogram of body weight by goal
| Goal / activity level | Grams per kg | Notes |
|---|---|---|
| Sedentary adult | 0.8 to 1.0 | Baseline to prevent deficiency, minimal exercise |
| Active / recreational | 1.2 to 1.4 | Regular general exercise a few times a week |
| Endurance athlete | 1.2 to 1.6 | Distance running, cycling, swimming |
| Strength / muscle gain | 1.6 to 2.2 | Resistance training, building or keeping muscle |
| Weight loss (calorie deficit) | 1.6 to 2.0 | Higher protein protects muscle and curbs hunger |
Approximate protein in common foods
| Food | Serving | Protein (g) |
|---|---|---|
| Chicken breast, cooked | 100 g | 31 |
| Eggs | 2 large | 12 |
| Greek yogurt, plain | 170 g cup | 17 |
| Lentils, cooked | 1 cup | 18 |
| Tofu, firm | 100 g | 17 |
| Whey protein powder | 1 scoop | 24 |
Common mistakes to avoid
- Treating 0.8 g/kg as a goal instead of a floor. The 0.8 g/kg figure is the minimum to avoid deficiency in sedentary people. If you train or are dieting, that amount is usually too low to support recovery and muscle retention.
- Using pounds where kilograms are expected. Multiplying your weight in pounds by a g/kg number more than doubles the real target. Convert to kilograms first, or let the tool do it by selecting lb.
- Eating all your protein in one meal. A single very large serving is less effective than spreading protein across the day. Aim for a moderate amount, often 20 to 40 g, at several meals.
- Ignoring protein quality and total diet. Grams alone are not the whole story. A mix of complete protein sources, enough total calories and adequate hydration all matter for results and health.
Glossary
- Protein
- A macronutrient made of amino acids, used to build and repair muscle and tissue and to run many body processes.
- Grams per kilogram (g/kg)
- A way to scale protein needs to body size by multiplying body weight in kilograms by a target number of grams.
- Calorie deficit
- Eating fewer calories than you burn, which drives weight loss. Higher protein during a deficit helps protect muscle.
- Muscle protein synthesis
- The process by which the body builds new muscle protein, stimulated by training and by eating protein.
- Complete protein
- A protein source that contains all nine essential amino acids, such as meat, eggs, dairy and soy.
- Lean body mass
- Everything in your body that is not fat, including muscle, bone and organs. Protecting it is a key goal when dieting.
Frequently asked questions
How much protein do I need per day?
It depends on your weight and goal. A sedentary adult needs about 0.8 g per kg of body weight, while active people need 1.2 to 1.4 g/kg, and those building muscle or losing fat often aim for 1.6 to 2.2 g/kg. Enter your weight and goal above to see your number.
How much protein to build muscle?
For muscle gain, most evidence supports 1.6 to 2.2 g of protein per kilogram of body weight per day, combined with resistance training and enough total calories. The calculator uses a 1.8 g/kg midpoint for that goal.
How much protein should I eat to lose weight?
During a calorie deficit, higher protein of about 1.6 to 2.0 g/kg helps protect muscle and reduce hunger, so you lose more fat and less muscle. Select the weight loss goal to get a target in this range.
Is the calculation based on body weight or goal weight?
Use your current body weight for most cases. If you carry a lot of excess fat, some dietitians base protein on a target or lean weight instead, so the result here may be on the higher side. A dietitian can personalise it.
How many grams of protein per meal?
Divide your daily target by the number of meals you eat. The tool does this for you and shows a per-meal figure. Many people land around 20 to 40 g per meal, which is a useful range for muscle protein synthesis.
Can too much protein be harmful?
For healthy adults, intakes in these ranges are widely considered safe. Very high intakes are usually unnecessary, and people with kidney disease should follow medical advice, because protein needs may be restricted. This tool is an estimate, not medical advice.
Sources
- Dietary Reference Intakes for Energy, Carbohydrate, Fiber, Fat, Fatty Acids, Cholesterol, Protein, and Amino Acids , National Academies of Sciences (Institute of Medicine) (2005)
- International Society of Sports Nutrition Position Stand: protein and exercise , Journal of the International Society of Sports Nutrition (2017)