egg

Protein Calculator | Calculate Daily Protein And Per-Meal Targets

Find your daily protein target in grams from your body weight, activity level and goal — fat loss, muscle gain or maintenance. Uses the research-backed 0.7–1.0 g per pound range for active people and shows how to spread it across meals.

Last updated: June 2026 · Free · No sign-up required

Results

Enter values above and click Calculate to see your result instantly.

Quick reference

Protein targets by goal:

Goal / activity	Grams per lb	Grams per kg
Sedentary (RDA)	0.36	0.8
Active / general fitness	0.5–0.7	1.1–1.5
Building muscle	0.7–1.0	1.6–2.2
Cutting (preserve muscle)	0.9–1.1	2.0–2.4

monitor_weight A starting point, not a diagnosis

This calculator gives you the same number a clinician would compute by hand from your inputs. It is informational, never a substitute for a doctor. If a result surprises you, write it down and discuss it at your next appointment — that conversation is the goal, not a verdict from a webpage.

science Built from peer-reviewed formulas

Every health calculator on CalcaTools uses an equation from the WHO, NIH, ACOG, CDC, or a published peer-reviewed paper. The exact citation is in the "Formula & methodology" section. We re-check sources quarterly and update the page when guidance changes — the "Last reviewed" date is at the top.

volunteer_activism Designed for real people

Health calculations only help if you can actually use them. We use plain-English labels (no jargon), accept both metric and US units, and show what a "normal" range looks like alongside your result — so you understand what the number means, not just what it is.

lock Private by design

Your weight, height, age, pregnancy details, and any other health input never leave your browser. Calculations run client-side; nothing is logged or stored on our side. We don't want your medical data — we just want the formula to work for you.

Interpretation guide

Protein basics:

Concept	Detail
Per meal	~20–40 g for muscle synthesis
Timing	Spread across the day
Quality	Complete proteins have all amino acids
1 g protein	4 calories

lightbulb Worked example

Let's say you are using the Protein Calculator. Finds your daily protein target in grams based on your body and goals. Enter your weight, activity level, and fitness objective — maintenance, muscle building, or weight loss — and the tool applies Enter the values that match your situation into the input fields and press calculate — using realistic numbers makes the result directly useful for you.

Result: The calculator instantly applies the formula Daily protein (g) = body weight (lb) x target factor (0.36 to 1.0 by goal) and returns the result with appropriate precision.

What this means: Read the result in the context of what you are measuring. The step-by-step breakdown lets you confirm the math and understand which input most affects the outcome.

Formula & methodology

Formula: Daily protein (g) = body weight (lb) x target factor (0.36 to 1.0 by goal)

The Protein Calculator is built on a well-established calculation method. It uses the formula Daily protein (g) = body weight (lb) x target factor (0.36 to 1.0 by goal) to turn your inputs into a reliable result. Finds your daily protein target in grams based on your body and goals. Enter your weight, activity level, and fitness objective — maintenance, muscle building, or weight loss — and the tool applies the standard The steps are shown on the page so you can follow the reasoning from input to output.

Protein needs scale with body weight and activity. The sedentary RDA is about 0.36 g per pound (0.8 g/kg), but active people and those building or preserving muscle benefit from substantially more — commonly 0.7–1.0 g per pound. The calculator multiplies your weight by a goal-based factor and can divide the total into per-meal targets. Spreading intake across meals (20–40 g each) best supports muscle protein synthesis.

What is the Protein Calculator?

The Protein Calculator is a free, browser-based health calculator tool that helps you Finds your daily protein target in grams based on your body and goals. Enter your weight, activity level, and fitness objective — maintenance, muscle building, . Instead of working through the math by hand or in a spreadsheet, you enter your values and the calculator returns an accurate result instantly — while still showing the formula and the steps so you can verify the reasoning. It is designed for quick everyday use: no sign-up, no installation, and everything runs locally in your browser for complete privacy.

How to use the Protein Calculator

Enter the required values into the input fields.
Press the calculate button — the result appears immediately, updated live as you change any value.
Read the step-by-step breakdown below the result to see exactly how the calculation was performed.
Use the interpretation guide to understand what the result means for your situation, and try different inputs to see how they change the outcome.

How to use the Protein Calculator

Enter your body weight, activity level, and goal — sedentary health, active lifestyle, muscle gain, or weight loss — and the tool applies the standard factor: Daily protein (g) = body weight (lb) × target factor, where the factor ranges from about 0.36 g/lb for sedentary adults up to 0.8–1.0 g/lb for athletes in a deficit. The result is your daily protein target in grams, with a suggested range so you can adjust by personal preference.

Interpreting your result

The recommended dietary allowance for sedentary adults is 0.36 g per pound (0.8 g/kg), which prevents deficiency but is low for active people. For muscle building and fat loss, research supports 0.7–1.0 g per pound of body weight, with the higher end during a calorie deficit to preserve muscle. Protein is also the most satiating macro, which is why higher-protein diets aid weight management. The calculator gives you the number for your goal — for a 180 lb athlete in a deficit, that is roughly 144–180 g per day, spread across meals.

Common mistakes to avoid

The most common error is using total weight rather than lean mass — for very overweight individuals, the per-pound-of-total-weight factor overestimates needs; use lean mass or a moderate factor. Second, treating the sedentary RDA as a training target — 0.36 g/lb is a floor, not an athletic goal. Third, eating all the protein in one meal: the body uses it better spread across 3–4 feedings of 30–50 g. Finally, forgetting that protein still counts calories — 4 kcal per gram — so high-protein plans need to fit the calorie budget.

Tips for best results

Prioritize protein at every meal — a 30–40 g serving of chicken, fish, Greek yogurt, eggs, or legumes covers the bulk of a typical day. During a weight-loss phase, keep protein at the high end (0.8–1.0 g/lb) to protect lean mass. For plant-based diets, aim slightly higher to compensate for lower digestibility of some plant proteins. Spread intake evenly rather than front-loading. Recalculate when your weight or training phase changes — cutting phase needs more, maintenance less.

Authoritative source: U.S. Centers for Disease Control and Prevention

Frequently asked questions

How much protein do I need per day?

The Protein Calculator is free, private, and accurate: it runs entirely in your browser (no uploads, no accounts), applies the standard calculation, and explains each step so you can verify the result. Finds your daily protein target in grams based on your body and goals. Enter your weight, activity level, and fitness objective — maintenance, muscle building, or weight loss — and the tool applies the standard grams-per-kilogram guidelines to recommend how There is no limit on usage, and it works on any device.

Is more protein better for muscle gain?

Up to a point — research shows muscle gain plateaus around 0.7–1.0 g per pound of body weight for most lifters, and intakes far above that (2+ g/lb) add nothing more while displacing other macros. During a calorie deficit, staying at the upper end preserves muscle; during a surplus, the lower end suffices. More is not harmful for healthy kidneys, just unnecessary.

How much protein per meal?

Aim for 25–50 g per meal across 3–4 meals, which research suggests maximizes muscle protein synthesis per feeding — amounts much above ~0.4 g/kg per meal (about 40 g for most people) offer diminishing returns. Spreading the day's protein across meals beats one giant dinner portion. Post-workout, a 25–40 g serving within a few hours is plenty; the daily total matters most.

Do I need protein on rest days?

Yes — muscle protein turnover continues on rest days, and the daily target applies every day, not just training days. Keeping protein consistent (same daily target) on rest days supports recovery and prevents the deficit that training-day-only protein creates. There is no need for extra on training days beyond the standard target — consistency across the week is what matters.

Can I get enough protein from plants?

Yes — with planning: legumes, tofu and tempeh, seitan, quinoa, nuts, and seeds can meet the target, and soy is a complete protein. Plant proteins are somewhat less digestible and lower in some essential amino acids, so aim slightly higher (about 10–20% more) and vary your sources to cover the amino acid profile. A well-planned plant-based diet easily hits 1.0 g/lb for active people.

What does the Protein Calculator do?

Finds your daily protein target in grams based on your body and goals. Enter your weight, activity level, and fitness objective — maintenance, muscle building, or weight loss — and the tool applies the standard grams-per-kilogram guidelines to recommend how. The calculator takes your inputs, applies the standard calculation, and returns a clear result so you can make an informed decision without doing the math by hand.

What formula does the Protein Calculator use?

The Protein Calculator applies the standard formula: Daily protein (g) = body weight (lb) x target factor (0.36 to 1.0 by goal). The tool walks through each step of the calculation so you can verify the numbers yourself.

Is the Protein Calculator free and private?

Yes — the Protein Calculator. There is no sign-up, no paywall, no trial, and no limit on how many calculations you can run. CalcaTools covers its costs with non-intrusive display advertising, so the calculator itself never asks for payment or restricts any feature.

How accurate is the Protein Calculator?

The Protein Calculator applies the standard formula: Daily protein (g) = body weight (lb) x target factor (0.36 to 1.0 by goal). It is tested against published worked examples before launch and uses native double-precision arithmetic, so results are accurate to typical precision for the values you enter — with no intermediate rounding that could distort the answer.

Explore the full health & fitness toolkit

Every CalcaTools health calculator — BMI, calories, macros, heart rate, pregnancy, and body composition — with practical guidance on every result.