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Protein Calculator

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How this protein calculator works

Enter body weight in kilograms and a protein factor in grams per kilogram. The calculator multiplies them: Protein (g/day) = Weight (kg) × Factor (g/kg). A 70 kg weight with the default factor 1.2 gives 84.0 g/day. The answer is shown to one decimal place and labelled g/day.

The factor field starts at 1.2. Change it to match the grams-per-kilogram figure you want to use. 60 kg × 0.8 = 48.0 g/day. 80 kg × 1.6 = 128.0 g/day. 90 kg × 2.0 = 180.0 g/day. Both weight and factor must be greater than 0; an empty weight or a non-positive factor leaves the result as “--.”

This is only a multiplication estimate. It does not adjust for age, health conditions, or training plans, and it is not medical or diet advice. Convert pounds to kilograms before entering weight if needed. The page returns one daily total, not a meal-by-meal split.

Check by hand: multiply kilograms by the factor. 75 × 1.2 = 90.0 g/day. 50 × 1.0 = 50.0 g/day. 100 × 1.2 = 120.0 g/day.

Protein examples

Each row is Weight × Factor, rounded to one decimal as on the calculator.

Weight (kg)Factor (g/kg)ProteinWhat it marks
701.284.0 g/dayDefault factor
751.290.0 g/daySame factor, higher weight
600.848.0 g/dayLower factor
501.050.0 g/day1 g per kg
651.491.0 g/dayMid factor
801.6128.0 g/dayHigher factor
902.0180.0 g/day2 g per kg
1001.2120.0 g/day100 × 1.2

How to read the result

  • Weight × Factor

    70 × 1.2 = 84.0 g/day.

  • Factor in g/kg

    Default 1.2; change it to raise or lower the total.

  • One decimal place

    65 × 1.4 shows 91.0 g/day.

  • Estimate only

    Not personalized medical or diet advice.

Frequently asked questions

  • What does this protein calculator find?

    An estimated daily protein amount in grams. The formula is Protein (g/day) = Weight (kg) × Protein factor (g/kg). A 70 kg weight with the default factor 1.2 gives 84.0 g/day. The result is shown to one decimal place.

  • What is the protein factor?

    Grams of protein per kilogram of body weight per day. The field starts at 1.2. Raising the factor raises the daily total: 80 kg × 1.6 = 128.0 g/day. Lowering it reduces the total: 60 kg × 0.8 = 48.0 g/day.

  • What units should I use?

    Enter body weight in kilograms. The factor is in g/kg, so the answer is labelled g/day. If you know weight only in pounds, convert to kilograms first (pounds ÷ 2.2046 ≈ kilograms).

  • Why does the factor default to 1.2?

    1.2 g/kg is a common starting estimate many people use above a basic sedentary figure. The page does not lock you to that value—you can change it. 75 kg × 1.2 = 90.0 g/day.

  • Is this medical or diet advice?

    No. It only multiplies weight by the factor you enter. Needs vary with age, health, training, and goals. Use the number as a rough estimate, not a prescription.

  • What inputs are required?

    Weight and factor must both be finite numbers greater than 0. An empty weight, zero, or a non-positive factor leaves the result as “--.” The factor field starts filled at 1.2.

  • How precise is the answer?

    The daily total is fixed at one decimal place. 65 kg × 1.4 = 91.0 g/day. 100 kg × 1.2 = 120.0 g/day.

  • Can I use a higher factor for training?

    Yes if that is the factor you choose. For example 90 kg × 2.0 = 180.0 g/day. The calculator does not decide whether that factor is right for you; it only multiplies.

  • What if weight is 50 kg and the factor is 1.0?

    50 × 1.0 = 50.0 g/day. Any positive pair works the same way: daily grams equal kilograms times grams per kilogram.

  • Does this split protein across meals?

    No. It returns one daily total. How you divide that across meals or foods is outside the formula.