70 kg x 0.8 g/kg
- Calories from protein
- 224 kcal
- Target factor
- 0.8 g/kg
- Weight
- 70 kg
Protein Calculator
Use this free protein calculator to estimate daily protein grams from body weight and common grams-per-kilogram targets, with protein calories and nutrition-planning limits.
Estimate, not diagnosisFormula notesExample inputsTab-only history
Formula steps
- Choose a protein factor in grams per kilogram of body weight.
- Multiply body weight in kilograms by that factor.
- Adjust with professional guidance when medical conditions affect protein needs.
Examples
Recent answers
Recent protein targets will appear here.
Protein needs can change with age, training, pregnancy, kidney disease, and clinical guidance.
Inputs and recent answers stay in this browser tab and are not sent to a server.
How to use the Protein Calculator
- Enter the requested measurements, dates, lab values, or workout details.
- Check that the units and formula assumptions match what the tool is asking for.
- Press the calculate button to see the answer, supporting metrics, and formula steps.
- Read the estimate with the health disclaimer in mind, then copy the result if you need it for notes.
What people use it for
Estimate an RDA-style 0.8 g/kg adult protein reference from body weight.
Compare 1.2 g/kg active and 1.6 g/kg strength-training planning targets.
Convert body weight in kilograms to daily protein grams and protein calories.
Use with calorie, macro, carbohydrate, and fat tools before building a meal plan.
Quick examples
RDA-style 70 kg
70 kg x 0.8 g/kg56 g/day; 224 kcal from protein
Active 80 kg
80 kg x 1.2 g/kg96 g/day; 384 kcal from protein
Strength 75 kg
75 kg x 1.6 g/kg120 g/day; 480 kcal from protein
Larger body weight
90 kg x 0.8 g/kg72 g/day; 288 kcal from protein
Need the guide or a nearby tool?
Need a slower walkthrough, a related calculator, or the full library? These links keep you close to the task you started.
- How to use the Protein CalculatorSee slower examples, input meanings, formula notes, result limits, and mistakes to avoid.
- Health & FitnessBrowse related calculators and utilities in the same category.
- Calculator and utility guidesFind more guides that use real tool inputs and example numbers.
- All free toolsSearch every live tool, converter, calculator, AI helper, and browser utility.
Frequently asked questions
Plain-language answers about when to use the estimate, what the formula means, what it cannot decide for you, and how privacy works.
When should I use the Protein Calculator?
Use it for simple educational checks, trend tracking, or planning tasks like these: Estimate an RDA-style 0.8 g/kg adult protein reference from body weight. Compare 1.2 g/kg active and 1.6 g/kg strength-training planning targets. It can help you understand a number, but it cannot explain your whole health situation.
What do the main Protein Calculator inputs mean?
Enter body weight in kilograms, then choose the protein factor in grams per kilogram. The presets are 0.8 g/kg for an RDA-style adult reference, 1.2 g/kg for an active planning target, and 1.6 g/kg for a strength-training planning target. Do not enter pounds in the kilogram field; convert pounds to kilograms first if needed.
What is the Protein Calculator doing with my inputs?
In plain language: Daily protein grams = body weight in kilograms x selected protein factor in grams per kilogram. Protein calories = daily protein grams x 4 kcal per gram. Read the result together with the notes on the page, because health and fitness numbers often need personal context.
How should I read the Protein Calculator result?
Read the answer as daily protein grams for the body weight and g/kg factor you selected. The protein-calorie line uses 4 kcal per gram. Higher targets can be appropriate for some active people, but the calculator does not know your age, kidney health, pregnancy or lactation status, medical history, total calories, food quality, or dietitian plan.
What does 0.8 g/kg mean in the Protein Calculator?
It means 0.8 grams of protein for each kilogram of body weight. For example, 70 kg x 0.8 g/kg = 56 g/day. Treat it as a general adult reference, not a personalized diet order.
What do the 1.2 g/kg and 1.6 g/kg presets mean?
They are simple planning factors for people comparing higher active or strength-training targets. They are not a sports nutrition prescription, muscle-gain guarantee, or proof that more protein is better for every body.
Can I enter pounds instead of kilograms?
No. This calculator asks for kilograms because the factor is grams per kilogram. To convert pounds to kilograms, divide pounds by about 2.20462, then enter the kilogram value.
Why does the calculator show calories from protein?
Protein provides about 4 calories per gram. The calculator multiplies the daily protein grams by 4 so you can compare the protein target with macro or calorie planning.
Should people with kidney disease use this target?
Not as personal advice. Kidney disease, dialysis, pregnancy, lactation, eating-disorder recovery, illness, surgery recovery, and clinician protein limits all need individualized medical or dietitian guidance.
Can I split the protein target across meals?
You can divide the daily gram target by meals as planning math, but the calculator does not decide meal timing, food quality, digestion, training recovery, or medical nutrition needs.
Can I use this as medical advice?
This is educational nutrition planning math, not medical nutrition therapy, kidney disease advice, pregnancy or lactation nutrition advice, eating-disorder guidance, a muscle-gain guarantee, or a registered dietitian or clinician plan. Use the calculator as a learning tool, then ask a qualified professional about decisions that affect care, pregnancy, medication, nutrition, or safety.
What should I double-check before trusting the result?
Check that body weight is in kilograms and that the selected factor is grams per kilogram, not grams per pound. If you have kidney disease, pregnancy or lactation needs, an eating-disorder history, a clinician protein limit, or a registered dietitian target, use that personal guidance instead of a generic preset.
Does the site save my health inputs?
No. The calculator runs in your browser tab. Recent answers stay only on the page while you use it, and they are not sent to a server.