How to Calculate Protein Intake: Daily Grams by Body Weight

Searching how to calculate protein intake usually means you want a practical daily target in grams. Protein is an essential macronutrient — it builds and repairs muscle tissue, supports immune function, produces enzymes and hormones, and is the most satiating macronutrient per calorie. Knowing your daily protein target is one of the most useful steps in any nutrition plan.

The Basic Protein Formula

Protein grams per day = Body weight in kg × Target grams per kg

If you know your weight in pounds, convert it first:

Kilograms = Pounds × 0.453592

Or divide pounds by 2.2 for a quick estimate.

The Recommended Dietary Allowance (RDA)

The U.S. Recommended Dietary Allowance for protein is 0.8 grams per kilogram of body weight per day for sedentary adults. This is the minimum amount intended to prevent deficiency in most healthy adults.

It is not an optimal target for people who exercise regularly, are older adults, are trying to lose fat, or are building muscle.

Protein Targets by Goal

Research generally supports higher protein intakes for active people and those in a calorie deficit:

Context	Protein Target (g/kg)
Sedentary adult (minimum)	0.8 g/kg
General fitness / active adults	1.2–1.6 g/kg
Fat loss (preserving muscle)	1.6–2.2 g/kg
Muscle building	1.6–2.0 g/kg
Athletes in intense training	2.0–2.4 g/kg
Older adults (65+)	1.0–1.2 g/kg minimum

A 2017 meta-analysis in the British Journal of Sports Medicine found that protein intakes beyond approximately 1.62 g/kg/day did not produce additional muscle gain in most people who were resistance training. However, intakes up to 2.2 g/kg showed no harm and may be useful during aggressive fat loss.

Examples by Body Weight

Example 1: 70 kg person (154 lbs)

Goal	Protein Target
Sedentary (RDA)	56 g/day
Active general	84–112 g/day
Fat loss	112–154 g/day
Muscle gain	112–140 g/day

Example 2: 85 kg person (187 lbs)

Goal	Protein Target
Sedentary (RDA)	68 g/day
Active general	102–136 g/day
Fat loss	136–187 g/day
Muscle gain	136–170 g/day

Example 3: 55 kg person (121 lbs)

Goal	Protein Target
Sedentary (RDA)	44 g/day
Active general	66–88 g/day
Fat loss	88–121 g/day
Muscle gain	88–110 g/day

Protein and Daily Calories

Protein provides 4 calories per gram. Knowing your protein target helps you see how protein fits within your total calorie goal.

Example: 130 g protein per day:

130 × 4 = 520 calories from protein

If your daily target is 2,000 calories:

520 / 2,000 = 26% of calories from protein

That is a reasonable protein percentage for most active people.

Converting Pounds to Kilograms for the Formula

Body Weight (lbs)	Body Weight (kg)	1.6 g/kg	2.0 g/kg
110 lb	50 kg	80 g	100 g
130 lb	59 kg	94 g	118 g
150 lb	68 kg	109 g	136 g
170 lb	77 kg	123 g	154 g
190 lb	86 kg	138 g	172 g
210 lb	95 kg	152 g	190 g
230 lb	104 kg	166 g	208 g

Protein Sources and Their Protein Content

Knowing target grams is one thing; knowing how to hit them with food is another.

Food	Serving	Protein
Chicken breast (cooked)	100 g	~31 g
Salmon (cooked)	100 g	~25 g
Eggs	2 large	~12 g
Greek yogurt (plain)	170 g	~17 g
Cottage cheese	110 g (1/2 cup)	~14 g
Lentils (cooked)	200 g (1 cup)	~18 g
Tofu (firm)	100 g	~8 g
Black beans (cooked)	170 g (1 cup)	~15 g
Whey protein powder	30 g (1 scoop)	~24 g
Ground beef (90% lean)	100 g	~26 g

Distributing Protein Throughout the Day

Research on muscle protein synthesis (MPS) suggests that distributing protein relatively evenly across 3–4 meals may be more effective than eating most protein in one meal.

A practical approach:

• Aim for 25–40 g protein per meal
• Include protein in snacks if needed to hit your daily target
• Post-workout protein timing matters somewhat, but total daily intake is more important

Example daily distribution for a 130 g protein target:

• Breakfast: 30 g (3 eggs + Greek yogurt)
• Lunch: 35 g (chicken breast + beans)
• Snack: 25 g (cottage cheese + protein shake)
• Dinner: 40 g (salmon + lentils)

Total: 130 g

Protein for Older Adults

Adults over 65 tend to lose muscle mass (sarcopenia) more quickly and benefit from protein intakes at the higher end of the sedentary range:

Recommended: 1.0–1.2 g/kg/day for sedentary older adults, and up to 1.6 g/kg/day for those who are physically active.

Higher protein intakes in older adults, combined with resistance training, are one of the most evidence-supported strategies for slowing age-related muscle loss.

Does High Protein Harm Your Kidneys?

In healthy adults, higher protein intakes (up to 2.2 g/kg) have not been shown to harm kidney function. The concern about protein and kidney health is relevant primarily for people who already have chronic kidney disease — in those cases, dietary protein restriction is sometimes medically appropriate.

If you have existing kidney disease or other medical conditions, consult your doctor before making significant dietary changes.

The Bottom Line

To calculate protein intake, multiply body weight in kilograms by a daily target based on your goals. The adult RDA is 0.8 g/kg/day (minimum for sedentary adults), while active people and those managing body composition typically aim for 1.6–2.2 g/kg/day. Distribute protein across meals and choose high-quality sources to hit your daily target.

Use the Calorie Calculator to see how protein fits into your overall daily calorie goal.

Informational note: Protein needs vary with age, pregnancy, illness, kidney function, and activity level. For personalized nutrition recommendations, consult a registered dietitian or qualified healthcare provider.

How to Calculate: Step-by-Step Guide

1

Use body weight

Start with your body weight in kilograms, or convert pounds to kilograms first.

2

Pick a protein target

Choose a daily grams-per-kilogram target based on general needs and activity.

3

Multiply and distribute

Multiply body weight by the target and spread protein across meals if helpful.