How much protein is required?
Written by The Kalcule Team · Last updated August 17, 2026
Required for what? The protein RDA prevents deficiency. Training, ageing and calorie deficits raise practical targets. This article maps those numbers to the protein calculator.
The RDA is a floor
0.8 g/kg/day for healthy adults is about adequacy, not muscle gain. That floor comes from the Institute of Medicine Dietary Reference Intakes. Older adults and athletes often benefit from more. Kidney disease can mean less — that is a specialist call.
Ranges you will see online
1.2–2.2 g/kg appears in sports nutrition summaries. The right point in that range depends on training, deficit size and total calories. More is not always better.
Per kilogram of what
Total body weight is the usual public figure. Some practitioners use lean mass or adjusted weight in obesity. Ask the professional who is actually coaching you.
Hit a total, then distribute
Daily total first. Distribution is a refinement. Use the protein calculator, then protein per meal if you like structure.
How to use the number
Run the protein calculator for a daily total, then distribute however you can repeat. The RDA (0.8 g/kg) is a deficiency floor from the Institute of Medicine Dietary Reference Intakes, not a sports target. Kidney disease can mean less. That is a specialist decision, not something a website can override.
If the number feels high, check whether you used total body weight in obesity; some practitioners use an adjusted weight. We cannot choose that for you.
Deficit, age and training
In a calorie deficit, protein is insurance against leaning on muscle for energy. Older adults often sit toward the higher sports-nutrition summaries (around 1.2 g/kg and up) because sarcopenia is a real risk — alongside lifting, not instead of it.
Athletes in heavy training use the upper part of the 1.2–2.2 g/kg band more often than office workers at maintenance. The protein calculator does not know your training plan. Recalculate when the goal changes, not on a fixed weekday out of habit.
What more protein will not do
Extra protein does not cancel a surplus. It does not detox anything. It does not replace sleep. Past a point you are just eating expensive calories that could have been carbohydrate around training.
Collagen, bone broth and flavoured protein drinks are incomplete answers to a daily total. Mixed meals still do the work. See protein per meal if you want a meal structure, not only if you missed the day’s grams.
Frequently Asked Questions
Daily protein requirements.
No. It is a round imperial heuristic (~2.2 g/kg) at the high end of common sports ranges.
Many guidelines nudge older adults up to help against sarcopenia, alongside lifting. Confirm with a clinician.
Weekly average matters. Do not double the next day as punishment.
Collagen is incomplete for muscle protein synthesis. It does not replace mixed protein sources.
Some coaches do in obesity. This site’s protein calculator uses the weight you type. Ask the person actually coaching you before you invent an adjusted weight.
Per gram, some plant foods are less leucine-dense. You can still hit a daily total with soy, legumes and a bit more food. Variety across the day matters more than each plate being complete.
Usually the same daily target is simpler. Muscle repair does not stop in the evening.
Sports-range intakes are generally considered acceptable when kidneys are healthy. Kidney disease needs a clinician, not a limit from a website.
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