Protein Calculator: Daily & Per-Meal Targets

How this protein calculator works

The calculator multiplies your selected weight by a goal-specific protein range. It displays a daily range, a practical starting target, and a way to divide that target across meals. A range is more useful than implying there is one exact number your body needs.

These estimates are for generally healthy adults. They are not designed for children, pregnancy, breastfeeding, eating-disorder recovery, or medical protein prescriptions. Kidney disease and other conditions can change what is appropriate.

Choose a goal, then see the assumptions

The adult protein RDA is 0.8 g/kg/day, a reference intended to meet the needs of nearly all healthy adults, not merely a deficiency cutoff. Our everyday range and 1.0 g/kg target add practical planning flexibility; they are not separate official requirements. See the National Academies’ Dietary Reference Intakes.

For most exercising adults, the ISSN protein position stand supports approximately 1.4–2.0 g/kg/day. For resistance training, Morton and colleagues’ meta-analysis found an estimated breakpoint near 1.6 g/kg/day, with uncertainty across individuals. This does not establish a universal cap on usefulness, a safety limit, or a need to consume the upper end.

Our muscle and fat-loss rows are practical presets informed by that literature, not one-to-one prescriptions from a single study. Lean, resistance-trained athletes in energy restriction may use recommendations expressed per kilogram of fat-free mass, which is different from total body weight. The Helms review discusses this specialized context. This calculator does not estimate fat-free mass or prescribe an athlete contest diet.

For healthy older adults, PROT-AGE recommends about 1.0–1.2 g/kg/day, with greater needs in some active or ill populations. We use the healthy older-adult range for everyday nutrition; we do not automatically apply illness-level targets to everyone over 65.

Which weight should I use?

Current body weight is the default. The tool never changes the basis behind the scenes. If a dietitian or clinician has agreed a reference weight with you, choose “Clinician-agreed reference weight” and enter that value instead.

Body-weight formulas can overestimate requirements at higher levels of body fat. Selecting a very low aspirational goal weight can also underestimate them. There is no universal 10% gap at which everyone should switch weights. If this materially changes your result, ask a dietitian to select an appropriate basis.

A worked example

For a 75 kg adult selecting regular exercise:

• Range: 75 × 1.4 to 75 × 2.0 = 105–150 g/day.
• Starting target: 75 × 1.6 = 120 g/day.
• Three meals: 40 g per meal.
• Four meals: 30 g per meal.

If the total is not evenly divisible, the tool distributes the rounding difference so the displayed meal portions add up to the daily target. These are meal-planning examples, not exact requirements at each meal.

Put protein into meals you already enjoy

Start by including a protein source at each meal: eggs, yogurt, beans, lentils, tofu, fish, poultry, or another option that fits your preferences. Use the food’s label or a reliable composition source for its actual protein content; portions and brands differ.

You do not need protein powder to meet a reasonable target. It can be convenient, but it is one option among many. See our high-protein food guide for food ideas and our macro-tracking guide for fitting protein alongside carbohydrates and fat.

Protein calculator questions

How much protein do I need per day?

It depends on your body weight, activity, age, and circumstances. The adult RDA is 0.8 g/kg, while exercise-focused ranges are often higher. Choose the goal that matches your routine and treat the displayed number as a starting point, not a diagnosis of your current intake.

How much protein do I need to build muscle?

This tool uses 1.6–2.2 g/kg/day for its muscle-building planning range, with a starting target of 1.8 g/kg. Resistance training, sufficient energy, and recovery also matter. More protein alone does not guarantee more muscle.

How much protein should I eat during weight loss?

The fat-loss preset uses 1.8–2.2 g/kg/day, with 2.0 g/kg as a practical starting target for muscle preservation. It is not necessary or appropriate for everyone losing weight. Training status, calorie intake, body composition, and medical needs influence the choice.

Is the top of the range a maximum safe intake?

No. It is the top of this tool’s planning range, not a toxicity threshold. More is not automatically better. If you have kidney disease or another relevant condition, use a clinician-set target rather than a general calculator.

Should I split protein evenly across meals?

Spreading intake can make a daily target easier to meet. The meal selector illustrates one distribution and does not claim that unequal meals are ineffective or that your body cannot use protein above a fixed per-meal amount.

Does the calculator work in pounds and kilograms?

Yes. US units use pounds; metric uses kilograms. Both feed the same calculation using 1 lb = 0.45359237 kg. Blank or out-of-range values show an error instead of being silently replaced.

Why is the macro calculator’s protein target different?

Our calorie and macro calculator divides an energy budget by percentages. This tool estimates protein by body weight and goal. Use the difference as a reason to review the plan, not as proof that either number is a measured requirement.

Are my weight and results stored?

No account is required. Inputs stay in the current page’s browser state and are not sent with our analytics. Reloading clears them. Copying results is optional and puts the displayed summary on your clipboard.

Keep your food journal useful

Once you have a target, use food entries to understand your usual intake. Learn how meal estimates work or explore all free nutrition calculators. Nutrition calculators provide educational estimates and do not replace care from a qualified professional.