Exsercise.com
Guides

How Much Protein Do You Need

Published

Estimate daily protein from bodyweight with conservative g/kg targets for general health, strength training, muscle gain, and fat loss — plus how to use our protein calculator.

Daily protein needs are easiest to plan as grams per kilogram of bodyweight. Sedentary adults often sit near the RDA baseline; people who lift or do hard endurance work usually land higher. This guide walks through the same bodyweight-based targets used on our Protein Intake Calculator. It is general fitness guidance for healthy adults, not medical advice.

The simple formula

daily protein (g) ≈ bodyweight (kg) × grams per kilogram

Example: 80 kg × 1.6 g/kg ≈ 128 g/day.

If you only know pounds, convert first (lb × 0.4536 ≈ kg) or use the calculator’s imperial input. Protein contributes about 4 kcal per gram, so 128 g is roughly 512 kcal from protein — useful when you already have a calorie budget.

Starting g/kg ranges

These presets match common sports-nutrition guidance (including ISSN-style ranges for exercising adults) and the calculator’s goal menu:

Goal Typical range Calculator preset
General health (RDA baseline) 0.8 g/kg 0.8 g/kg
Endurance / regularly active 1.2–1.6 g/kg 1.4 g/kg
Strength / maintain muscle 1.4–2.0 g/kg 1.6 g/kg
Muscle gain 1.6–2.2 g/kg 1.8 g/kg
Fat loss (preserve muscle) 1.6–2.4 g/kg 2.0 g/kg

For most people who lift several times per week and eat near maintenance, 1.4–2.0 g/kg is a practical band. During a calorie deficit, many lifters bias toward the higher end so training quality and lean mass are easier to protect. Very high intakes are not automatically better if total calories, sleep, and progressive training are the real limiters.

Worked example

Bodyweight 70 kg, goal strength / maintain muscle (1.6 g/kg):

  1. 70 × 1.6 = 112 g protein per day
  2. About 112 × 4 = 448 kcal from protein
  3. Spread across meals — for example four meals of ~25–30 g — rather than one giant shake

If the same person cuts calories for fat loss, the calculator’s 2.0 g/kg preset lands at 140 g/day. That is still a planning estimate: adjust for appetite, food preference, and how training feels over a few weeks.

How to use the protein calculator

  1. Open the Protein Intake Calculator.
  2. Choose metric (kg) or imperial (lb) and enter current bodyweight.
  3. Pick a goal preset, or enter a custom g/kg multiplier your coach already uses.
  4. Read the daily gram target and the ~kcal from protein line.
  5. Pair the number with progressive strength work — protein alone does not build muscle.

Useful training companions:

Distribution through the day

Sports-nutrition position stands often suggest spreading protein across the day — roughly 0.25 g/kg per meal or about 20–40 g per eating occasion for many adults, every few hours as schedule allows. Exact timing around workouts matters less than hitting the daily total with high-quality sources you can stick to (meat, fish, eggs, dairy, soy, legumes, or a simple whey/casein option if food falls short).

Common mistakes

  • Using “one scoop” as a daily plan instead of total grams
  • Setting an aggressive g/kg target while under-eating calories so hard that training stalls
  • Ignoring bodyweight changes — update the calculator when scale weight moves
  • Treating protein as a substitute for progressive overload, sleep, or enough total food
  • Copying contest-prep numbers when you train recreationally three days a week

Limitations

  • g/kg multipliers are population averages, not lab prescriptions
  • People with kidney disease or other clinical conditions need clinician guidance — do not self-prescribe high protein intakes in those cases
  • Body-composition goals also depend on total calories, training quality, and adherence
  • BMI and body-fat tools can add context but do not replace protein math: try the BMI Calculator, How to Calculate BMI, and Body Fat Calculator if you want those estimates alongside this guide

Quick links

One-Rep Max CalculatorRPE & Rest CalculatorPlate Loading CalculatorAll Guides