Formula
Protein intake formula
Protein grams per day = body weight in kg x grams per kg targetThe adult RDA baseline is 0.8 g/kg for healthy adults; active targets are planning estimates.
Protein Intake Calculator
Use this protein intake calculator to estimate daily protein grams from body weight and a chosen g/kg target.
Planning estimate
Live calculator
Protein intake
Daily protein target62 g/day
0.8 g/kg x 77.1 kg body weight.
Protein per meal21 g
If spread across 3 meals per day.
Adult RDA baseline62 g/day
Uses 0.8 g/kg for healthy adults as a baseline, not a disease-specific plan.
Use this as a planning estimate, not medical advice. Medical conditions, medication, pregnancy, eating disorder history, or disease-specific nutrition needs should be handled with a qualified professional.
How to use
Steps
- Enter body weight in pounds.
- Choose a protein target.
- Enter meals per day to split the target.
- Compare the selected target with the adult RDA baseline.
Example
Sample calculation
Weight170 lb
Target0.8 g/kg
Protein62 g/day
Calculator use
Best for
- Estimating body, hydration, protein, calorie, macro, or fitness planning numbers with assumptions visible.
- Comparing rough scenarios before tracking trends or discussing the result with a qualified professional.
Before relying on it
Check first
- Treating a screening or planning estimate as medical, nutrition, eating-disorder, pregnancy, or disease-specific advice.
- Ignoring age, sex, medication, body composition, training status, medical history, heat, illness, or measurement method.
- Changing diet, hydration, or training aggressively from one calculator result without appropriate context.
Details
What to know before using the result
RDA baseline0.8 g/kg
This is a general adult baseline and may not match athletic, older adult, pregnancy, illness, or clinical nutrition needs.
Target choiceGoal dependent
Training, dieting, age, appetite, kidney disease, and medical history can change what target is appropriate.
Meal splitPlanning only
Per-meal protein is a convenience estimate; total daily intake and food quality still matter.
Benchmarks
How to read the result
0.8 g/kg: Adult RDA baseline.
General healthy adult baseline, not a performance target.
1.2 g/kg: Active planning.
A common planning target for active people, depending on context.
1.6 g/kg: Higher training target.
Often used by strength-training calculators, but individual needs vary.
Calculator accuracy
Methodology and assumptions
Formula, inputs, limitations and review record
Formula
Protein grams per day = body weight in kg x grams per kg target
Inputs used
Weight, Protein target, Meals per day
Limitations
Health results are screening or planning estimates. Age, body composition, medication, medical history, pregnancy, and professional guidance can change the right interpretation.
Review record
Method and sources checked on July 12, 2026. The documented method, source timing, validity conditions, and reliance limits were checked on this date.
Method provenanceEstimate · toolkitshelf.protein-bodyweight-target.v1
- Maintained by
- Toolkit Shelf
- Calculation class
- Estimate
- Method version
- toolkitshelf.protein-bodyweight-target.v1
- Source date
- March 2016
- Source checked
- July 12, 2026
- Intended audience
- Healthy adults comparing a general 0.8 g/kg baseline with optional 1.2 or 1.6 g/kg active-planning scenarios.
- Valid when
- Use measured adult body weight and choose a scenario that fits the actual activity context. Pregnancy, kidney disease, illness, energy restriction, elite training, and other clinical needs require qualified guidance.
- Reliance boundary
- The selected grams-per-kilogram value is a planning scenario, not a personalized requirement, supplement recommendation, treatment plan, or assessment of protein quality.
- Data freshness
- The adult 0.8 g/kg reference baseline and sports-nutrition range containing the 1.2 and 1.6 presets were checked on July 12, 2026.
Cite this page
Toolkit Shelf. Protein Intake Calculator. https://toolkitshelf.com/tools/protein-intake-calculator
FAQ
Common questions
How much protein do I need per day?
A general healthy adult RDA baseline is 0.8 grams per kilogram of body weight. Higher planning targets may be used for training or specific goals.
Is more protein always better?
No. Needs vary, and medical conditions such as kidney disease can change protein guidance.
How do I convert pounds to kilograms for protein?
Multiply pounds by 0.4536, then multiply kilograms by the grams-per-kilogram target.
When should I ask a clinician?
Ask a clinician or qualified nutrition professional when pregnancy, medication, medical history, eating disorder risk, symptoms, or disease-specific guidance matters.
Why can health formulas be misleading?
Health formulas simplify age, sex, body composition, training status, measurement method, pregnancy, and medical context into a planning estimate.
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