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Last updated: June 1, 2026

Protein Intake Calculator: How Much Protein Per Day?

Find out exactly how many grams of protein you need daily based on your body weight, activity level, and fitness goal. Get personalized recommendations backed by sports nutrition research.

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Daily Protein Target

Optimal80g/day
Minimum64g/day
Maximum96g/day
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Understanding the Protein Intake Calculator

Protein is the building block your body uses to repair and grow muscle, and getting enough is essential whether you are training hard, losing weight, or simply staying healthy. This calculator estimates your daily protein target based on your body weight and goals.

How much you actually need

While the minimum to avoid deficiency is low, optimal intake for active people and those losing weight is considerably higher — commonly 0.7 to 1 gram per pound of body weight. Higher intakes preserve muscle during a calorie deficit and support recovery from training. Older adults also benefit from more protein to counter age-related muscle loss.

Timing and sources

Spreading protein across the day in moderate servings is generally more effective than loading it all into one meal. Quality sources include lean meat, fish, eggs, dairy, legumes, and tofu. If whole foods fall short, a protein supplement can help close the gap, but food-first is the better default for most people.

Tips & things to know

  • Spread protein across several meals rather than one large serving.
  • Higher protein helps preserve muscle while dieting.
  • Whole-food sources should come first; supplements fill gaps.

How It Works

Protein needs are calculated based on body weight multiplied by a factor that depends on your goal and activity level.

Sedentary: 0.8g/kg

Weight Loss: 1.2-1.6g/kg

Muscle Gain: 1.6-2.2g/kg

Athlete: 1.4-2.0g/kg

Sources

  • Phillips SM, Van Loon LJ. J Sports Sci. 2011;29(sup1):S29-S38.
  • Morton RW et al. Br J Sports Med. 2018;52(6):376-384.

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How to Use the Protein Intake Calculator

1

Open the Protein Intake Calculator

Navigate to the Protein Intake Calculator page on Redicalc. The calculator loads instantly with no sign-up required.

2

Enter your values

Fill in body measurements such as age, weight, height, and gender. Toggle between metric and imperial units if available.

3

Review your results

Your protein intake results appear instantly as you type. Review the breakdown, charts, or detailed analysis provided.

4

Adjust and compare

Try different input values to compare scenarios. This helps you understand how changes affect the outcome.

5

Share or save your results

Use the copy or share buttons to save your results. You can also bookmark the page for quick access later.

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Frequently Asked Questions

How much protein should I eat per day?

Most active adults need 1.2-2.0g of protein per kilogram of body weight. Sedentary adults need about 0.8g/kg. Higher amounts support muscle building and weight loss.

Can you eat too much protein?

For healthy adults, up to 2.2g/kg is well-tolerated. Very high intakes (over 3g/kg) offer no additional benefit and may strain kidneys in those with pre-existing conditions.

What are the best protein sources?

Chicken, fish, eggs, Greek yogurt, and lean beef are excellent sources. Plant-based options include lentils, tofu, tempeh, and edamame.

Should I eat protein before or after workout?

Total daily protein matters more than timing. That said, consuming 20-40g within 2 hours of training can maximize muscle protein synthesis.

Do I need protein supplements?

Supplements are convenient but not required. Whole food sources are preferred. Protein powder is useful if you struggle to meet your target through food alone.