Protein Calculator

Updated Sep 2026 Used 547 times

Use the Protein Calculator to calculate and interpret daily range midpoint.

Sex used by the calorie equation

The Mifflin-St Jeor equation uses sex-specific constants.

Age

Supported base range: 18 to 100 years.

Height

Supported base range: 1.2 to 2.3 m.

Body weight

Supported base range: 25 to 450 kg.

Typical activity level

Activity multipliers are broad estimates; day-to-day expenditure varies.

Protein reference context

These ranges answer different questions; the highest number is not automatically better.

Estimated daily calories

— kcal/day

Calculated automatically from your sex, age, height, weight, and activity selection.

Guest calculations stay on this device. Signed-in results sync privately.

Your result

Daily range midpoint

Enter your values, then calculate to see a verified result.

Inputs usedReview the information used for this result.

Full calculation and sourcesReview the equation, normalized inputs, assumptions, and version.

Versioned calculationFormula v3.0.0

What is estimated

A body-weight-based adult protein range plus an estimated-calorie comparison.

References supported

The longstanding 0.8 g/kg RDA, current U.S. guidance at 1.2-1.6 g/kg, and the ISSN 1.4-2.0 g/kg range for exercising adults.

Important limitation

Children, pregnancy, breastfeeding, kidney or liver disease, frailty, eating disorders, and prescribed diets require individualized guidance.

Estimate daily caloriesApply Mifflin-St Jeor and the selected activity factorResting energy x activity multiplier

Apply protein referencesUse body weight and the selected contextWeight x grams-per-kilogram factor

Compare the viewsSee the selected g/kg range and adult DRI energy rangeDaily grams and protein calories

Interpretation

The selected range midpoint is .

Estimated daily calories update from sex, age, height, weight, and activity.

The adult 10-35% energy range is a comparison view, not a personal requirement.

Use this result

GLP-1 Body Composition Change CalculatorCompare two lean-mass estimates without causal prediction.GLP-1 Weight Scenario ProjectorConvert a user-entered percentage assumption.GLP-1 Weight-Threshold CheckerCheck only the narrow FDA-label weight threshold.

Protein Calculator: purpose and method

Calculates daily range midpoint, daily range minimum, daily range maximum, and estimated daily calories from sex used by the calorie equation, age, height, and body weight with visible method, validation, precision, and limitations.

Keep exploring

4 related pages

Method and test recordFormula v3.0.0

Recorded scope: Generally healthy adult protein reference ranges plus an estimated-calorie comparison
Publisher: CalculatorGeek
Reviewed by: CalculatorGeek Editorial Team
Recorded review date: 2026-09-10
Next source review: 2027-09-10
Definition fixtures: 6 configured scenarios
Published examples: 6 shown below

Recorded method

The team checked every g/kg factor against the visible evidence context, pound conversion, Mifflin-St Jeor energy arithmetic, meal division, exclusions, and browser behavior.

These records describe the published model and reference tests. A test-case count is not a certification of every possible input or an independent specialist review. Editorial policy

Known limitations

The result is educational guidance for generally healthy adults, not a personalized prescription.
Height, age, sex, and activity affect only the separate estimated-calorie comparison; body-weight ranges use the selected g/kg context.
Children, pregnancy, breastfeeding, kidney or liver disease, frailty, eating disorders, and prescribed diets require individualized guidance.

Method sources

Latest model update

2026-09-09 - Imported the final primary-page copy and complete six-article content cluster from the September 9 Markdown package without altering calculator logic.

Reference inputs and expected results

These published examples are separate from the configured definition fixtures and any additional automated assertions. Expected values use the stated output units; invalid inputs are intended to be rejected.

Case	Inputs	Expected result
Adult RDA baseline	{"sex":{"value":"male"},"age":{"value":30,"unit":"years"},"height":{"value":170,"unit":"cm"},"weight":{"value":70,"unit":"kg"},"activity":{"value":"moderate"},"protein_context":{"value":"rda"}}	{"protein_min":56,"protein_max":56,"protein_mid":56}
Current U.S. guidance range	{"sex":{"value":"male"},"age":{"value":30,"unit":"years"},"height":{"value":170,"unit":"cm"},"weight":{"value":70,"unit":"kg"},"activity":{"value":"moderate"},"protein_context":{"value":"current-guidance"}}	{"protein_min":84,"protein_max":112,"protein_mid":98,"estimated_daily_calories":2507.1}
Exercising adult range	{"sex":{"value":"male"},"age":{"value":30,"unit":"years"},"height":{"value":180,"unit":"cm"},"weight":{"value":70,"unit":"kg"},"activity":{"value":"very"},"protein_context":{"value":"exercise"}}	{"protein_min":98,"protein_max":140,"protein_mid":119}
Pounds and feet equivalence	{"sex":{"value":"male"},"age":{"value":30,"unit":"years"},"height":{"value":{"feet":5,"inches":6.9291339},"unit":"ft-in"},"weight":{"value":154.323584,"unit":"lb"},"activity":{"value":"moderate"},"protein_context":{"value":"current-guidance"}}	{"protein_min":84,"protein_max":112,"protein_mid":98,"estimated_daily_calories":2507.1}
Four-meal arithmetic	{"sex":{"value":"male"},"age":{"value":30,"unit":"years"},"height":{"value":170,"unit":"cm"},"weight":{"value":70,"unit":"kg"},"activity":{"value":"moderate"},"protein_context":{"value":"current-guidance"}}	{"four_meal_split":24.5}
Invalid low weight	{"sex":{"value":"female"},"age":{"value":32,"unit":"years"},"height":{"value":165,"unit":"cm"},"weight":{"value":10,"unit":"kg"},"activity":{"value":"sedentary"},"protein_context":{"value":"rda"}}	Accessible validation error

Report an issue with this tool. Include the page URL, units, expected answer, and steps to reproduce. Do not include sensitive personal information.

On this page

Direct answer

Protein targets are commonly expressed in grams per kilogram of body weight per day:

daily protein (g) = body weight (kg) × protein factor (g/kg/day)

For a 70 kg adult, 0.8 g/kg equals 56 g/day, 1.2–1.6 g/kg equals 84–112 g/day, and 1.4–2.0 g/kg equals 98–140 g/day. These ranges come from different guidance contexts and should not be treated as interchangeable labels for one “perfect” target.

For the next related calculation, use the Body Fat Calculator. Monitor an estimated composition trend.

Continue from this result with the Macro Calculator. Convert a complete calorie split into grams.

Continue this planning task with the Protein Timing Calculator. Distribute a selected daily protein total across meals.

Continue this workflow with the Creatine Loading Calculator. Calculate product quantity for an already selected plan.

Continue this workflow with the GLP-1 Body Composition Change Calculator. Compare two lean-mass estimates without causal prediction.

How to use the calculator

Enter age, sex, height, and weight in the selected units.
Choose the activity description that matches a normal week.
Calculate the displayed baseline, recommended, and high values.
Read the method labels and exclusions before choosing a planning range.
Convert the daily range into foods or meals without treating every meal as an exact requirement.

To compare this result with another relevant method, open the BMI Calculator. Screen weight relative to height.

Formula and methodology

The selected context supplies a lower and upper factor:

Adult RDA baseline: 0.8 g/kg/day
Current U.S. guidance: 1.2-1.6 g/kg/day
Exercising adults: 1.4-2.0 g/kg/day

daily protein = body weight in kg x selected factor

The calculator separately estimates daily calories with Mifflin-St Jeor and one activity multiplier. The adult DRI energy comparison is 10-35% of calories / 4 kcal per gram. Height, age, sex, and activity affect that calorie comparison, not the selected body-weight protein range.

How the main reference ranges differ

Context	Range	What it means
Longstanding adult RDA baseline	0.8 g/kg/day	Population-level allowance designed to meet needs of nearly all healthy adults under the DRI framework
US Dietary Guidelines 2025–2030 target	1.2–1.6 g/kg/day	Current public guidance presented on the federal RealFood.gov site
Exercising adults, ISSN position stand	1.4–2.0 g/kg/day	Sports-nutrition range for building or maintaining muscle in most exercising people
Resistance-training meta-analysis	About 1.6 g/kg/day average breakpoint	Average additional benefit plateau in the studied setting; upper confidence bound reached about 2.2 g/kg/day

The 1.6 g/kg finding is not a universal maximum. The study population, energy balance, training, age, and uncertainty matter.

Worked examples

For 70 kg:

70 × 0.8 = 56 g/day

70 × 1.2 to 1.6 = 84 to 112 g/day

70 × 1.4 to 2.0 = 98 to 140 g/day

If the chosen planning target is 112 g/day across four eating occasions, the arithmetic average is 28 g per occasion. It is a distribution convenience, not a rule that every meal must hit exactly 28 g.

Which body weight should be used?

Most simple equations use current body weight. At a higher body weight, multiplying total weight by an athletic factor may produce a target that is unnecessarily high for some people. A clinician or registered dietitian may use an adjusted or goal weight based on context. Do not silently switch weight bases; label the method.

Protein during muscle gain or weight loss

Resistance training and total energy intake matter alongside protein. Review Protein for Muscle Gain for training evidence. During an energy deficit, see Protein for Weight Loss and the Calorie Deficit Calculator.

Important exclusions

Generic calculator targets are not appropriate stand-alone advice for children, pregnancy or breastfeeding, diagnosed chronic kidney or liver disease, dialysis, an eating disorder, underweight, frailty, or a medically prescribed diet. The National Kidney Foundation notes that protein needs in chronic kidney disease depend on disease stage, dialysis, nutrition status, and clinical guidance.

Inputs, outputs and result meaning

Inputs

Sex used by the calorie equation: The Mifflin-St Jeor equation uses sex-specific constants. Available choices are Female and Male.
Age: Supported units include years (yr). The supported range is 18 through 100.
Height: Supported units include centimeters (cm), meters (m), inches (in), feet (ft), and feet / inches (ft / in). The supported range is 1.2 through 2.3.
Body weight: Supported units include grams (g), kilograms (kg), and pounds (lb). The supported range is 25 through 450.
Typical activity level: Activity multipliers are broad estimates; day-to-day expenditure varies. Available choices are Sedentary, Lightly active, Moderately active, Very active, and Extra active.
Protein reference context: These ranges answer different questions; the highest number is not automatically better. Available choices are Adult RDA baseline (0.8 g/kg), Current U.S. guidance (1.2-1.6 g/kg), and Exercising adults (1.4-2.0 g/kg).

Outputs

Daily range midpoint: This is the primary result. It is displayed in g/day. The visible value is displayed without decimal places.
Daily range minimum: It is displayed in g/day. The visible value is displayed without decimal places.
Daily range maximum: It is displayed in g/day. The visible value is displayed without decimal places.
Estimated daily calories: It is displayed in kcal/day. The visible value is displayed without decimal places.
Midpoint split equally across 3 meals: It is displayed in g/meal. The visible value is displayed without decimal places.
Midpoint split equally across 4 meals: It is displayed in g/meal. The visible value is displayed without decimal places.
Selected lower factor: It is displayed in g/kg/day. The visible value uses up to 1 decimal places according to the output rule.
Selected upper factor: It is displayed in g/kg/day. The visible value uses up to 1 decimal places according to the output rule.

Daily protein = body weight (kg) x selected factor (g/kg/day). Keep the result label, unit, selected mode, and stated limitations together when sharing the answer.

Frequently asked questions

Is 0.8 g/kg enough?

It is the longstanding adult RDA baseline, not a universal performance target. Current US guidance and sports-nutrition evidence use higher ranges in specific contexts.

Is more protein always better?

No. Benefit does not rise indefinitely, and very high targets can crowd out other foods or conflict with medical needs. Choose a range for the goal and context.

Should I use pounds or kilograms?

The formula uses kilograms. Convert pounds by dividing by approximately 2.20462, or let the calculator normalize units before multiplication.

Do I need equal protein at every meal?

No. Distribution can be practical, but the daily total, food quality, training, and overall diet matter. Use meal values as planning ranges rather than exact biological thresholds.

Sources

Evidence and editorial status

Evidence for this package was checked on September 10, 2026. This material is educational and is not medical diagnosis, treatment, or individualized nutrition advice.