Protein Intake Calculator — Free Online Tool

The Protein Intake Calculator estimates a daily protein target from body weight, activity level, and goal — maintenance, muscle gain, or fat loss.

The reference numbers are worth knowing, because the gap between them causes most of the confusion. The official minimum in most countries sits around 0.8 grams per kilogram of body weight, and it is important to understand what that figure is: the amount required to prevent deficiency in a sedentary adult, not an optimum. Research on people training regularly consistently supports substantially more, generally in the range of 1.6 to 2.2 grams per kilogram for building or preserving muscle, with diminishing returns above that.

The case where protein matters most is often overlooked: during a calorie deficit. Higher intake while losing weight preserves lean mass that would otherwise be lost alongside fat, and protein is also the most satiating of the three macronutrients, which makes the deficit easier to sustain. Older adults are the other group with elevated needs, because the muscle-building response to protein declines with age.

Distribution across the day appears to matter somewhat — spreading intake across meals is modestly better than concentrating it in one — but total daily intake is the variable that dominates.

Very high intakes are not harmful for people with healthy kidneys, contrary to persistent belief, but anyone with existing kidney disease should follow medical guidance.

This is general information, not dietary advice. All calculation happens in your browser.

Our Protein Intake Calculator is completely free to use with no signup required. For this tool, processing runs in your browser — your files and data stay on your device and are not uploaded to our servers.

Whether you are a developer, designer, student, or business owner, this tool is designed to save you time and make your workflow more efficient. Bookmark this page to access it whenever you need it — it will always be free.