Start with body weight
Each selected band is expressed in grams per kilogram, then multiplied by your weight. Imperial entries are converted internally, so changing units does not alter the physiological recommendation.
Free body-weight nutrition tool
Protein Intake Calculator
Turn a relevant planning weight and your training demand into a useful daily protein band. Switch between kg and lb, apply the older-adult floor when appropriate, and see how the total distributes across meals—without saving personal data.
Use current weight when it is representative; otherwise use a realistic goal or reference weight. The tool covers 30–150 kg (66–330.7 lb).
Choose the demand that best matches your current phase.
Interpretation & evidence
How this protein estimate is formed
The output is deliberately a span rather than a single prescription. Body size sets the base; exercise, energy availability, and later life change the useful boundary.
Match training demand
Endurance work increases amino-acid turnover, while lifting supplies a reason to favor a higher intake. Dieting lifters receive the most elevated bracket to support lean-tissue retention.
Distribute the total
The per-meal figure simply divides both ends evenly. Treat it as an organizing aid: a larger dinner and smaller breakfast can still add up to an appropriate day.
Reference bands by situation
These ranges combine established adult minimums with sports-nutrition positions. They are planning boundaries, not diagnostic thresholds.
| Situation | Daily band | Approximate lb equivalent | Practical context |
|---|---|---|---|
| General adult health | 0.83–1.0 g/kg | 0.38–0.45 g/lb | Covers the adult reference point through a modest buffer |
| Endurance or mixed work | 1.2–1.6 g/kg | 0.54–0.73 g/lb | Useful across regular aerobic and combined training |
| Resistance or muscle gain | 1.4–2.0 g/kg | 0.64–0.91 g/lb | Broad enough for novice through experienced lifters |
| Fat loss with lifting | 1.8–2.2 g/kg | 0.82–1.00 g/lb | Higher bracket for a calorie-restricted phase |
| Healthy adult age 65+ | At least 1.0–1.2 g/kg | At least 0.45–0.54 g/lb | Acts as a floor; harder training can supersede it |
Two worked examples
Seeing the multiplication makes it easier to understand where the displayed grams come from.
75 kg resistance trainee
Applying 1.4–2.0 grams per kilogram gives a flexible lifting range:
75 × 1.4–2.0 = 105–150 g/day180 lb mixed-sport athlete
At 81.6 kg, the endurance and mixed bracket produces:
81.6 × 1.2–1.6 = 98–131 g/dayUse the midpoint as a simple starting line. Moving toward the upper edge may suit higher training loads, a calorie deficit, or a preference for protein-rich foods. Consistency matters more than hitting the same gram exactly every day.
When general guidance is not enough
This page offers general fitness education and cannot assess medical history, pregnancy, growth, kidney function, liver function, allergies, or an eating disorder. Children, pregnant or breastfeeding people, and anyone managing a clinical condition should use individualized guidance from a registered dietitian or physician.
Whole foods can cover the target; supplements are optional. If a sudden dietary change causes persistent symptoms, pause and speak with a qualified healthcare professional.
Build around your protein range
Connect protein with energy needs or pair nutrition decisions with your strength work.
Protein intake questions
Concise answers on units, aging, meal spacing, and when a general-purpose tool is not appropriate.
How much protein should I eat each day?
A general adult baseline is about 0.83 to 1.0 grams per kilogram of body weight. Regular endurance or resistance exercise raises the useful range, while a calorie deficit combined with lifting may justify the upper end.
Is protein better calculated from kilograms or pounds?
Either unit gives the same recommendation when converted correctly. One kilogram equals about 2.205 pounds, so 1.6 grams per kilogram is approximately 0.73 grams per pound.
Does protein need increase after age 65?
Many expert groups suggest at least 1.0 to 1.2 grams per kilogram for healthy older adults, with more potentially useful during illness or regular training. Individual medical needs can differ.
How should I divide protein across meals?
A workable approach is to distribute the daily total across three to five eating occasions. The calculator shows an even split; real meals do not have to match perfectly.
Can I use the result with kidney disease or during pregnancy?
Do not rely on a general fitness calculator for those situations. Pregnancy, kidney disease, liver disease, eating disorders, and other clinical conditions call for advice from a qualified clinician or dietitian.
Evidence behind the boundaries
The adult population reference comes from the European Food Safety Authority dietary reference values for protein. Exercise bands are informed by the International Society of Sports Nutrition position stand and the Academy of Nutrition and Dietetics, Dietitians of Canada, and ACSM joint position. The later-life floor reflects the PROT-AGE Study Group recommendations. Values shown here are a practical synthesis of those sources.