Protein Calculator: How Much Protein Do You Need Per Day?

How Much Protein Do I Need to Lose Weight?

When you eat in a calorie deficit, your body can pull amino acids from muscle as well as fat. Eating enough protein — paired with some resistance training — is what tells it to hold on to the muscle and burn the fat instead. That’s why a fat-loss protein target sits higher than a general health one. The arithmetic is one line:

That band is 0.7–1.0 g per lb of bodyweight, or roughly 1.6–2.2 g per kg. Where you land inside it depends on how much you train and how aggressive the cut is: more training and a steeper deficit push you toward the top, sedentary maintenance sits comfortably at the bottom.

Those numbers aren’t arbitrary. A 2018 meta-regression in the British Journal of Sports Medicine(Morton et al.) found that gains from extra protein during resistance training flatten out around 1.6 g/kg/day — useful as a floor rather than a ceiling. A systematic review of trained lifters dieting in a deficit (Helms et al., IJSNEM, 2014) landed higher, at 2.3–3.1 g per kg of leanmass, with the top of that range reserved for very lean athletes in aggressive cuts. Eating more than the band suggests isn’t harmful for healthy adults, but it stops buying you anything, and those calories have to come out of fat or carbs.

Protein also does double duty for weight loss beyond muscle. It has the highest thermic effect of the three macros — you burn more of its calories digesting it — and it is the most filling macro per calorie, which makes a deficit easier to hold without constant hunger. To set your protein target inside a full daily calorie and macro plan, run the Macro Calculator.

If you’re carrying a lot of fat, scale to lean mass

Bodyweight-based targets assume a fairly ordinary body composition. Fat tissue doesn’t need feeding with protein, so at a high body fat percentage the simple formula overshoots. The fix is to run the same maths on lean body mass:

• Lean body mass= body weight × (1 − body fat %)
• Then aim for 1.0–1.2 g per lb of lean mass (about 2.2–2.6 g/kg).

For a 250 lb man at 35% body fat, that’s about 163 lb of lean mass and a target of 163–195 g — noticeably more liveable than the 225 g the bodyweight formula returns, and it protects the same muscle. You need a body fat estimate to use it: the Navy Body Fat Calculator gets there from a tape measure, and the Body Fat Percentage Calculator shows where the result sits against the standard bands.

Protein Needs by Goal

Same body weight, three different jobs for the protein. Fat loss asks the most of it, because that’s when muscle is under threat and fullness matters most. Find your weight, read across:

The surprise in that table is usually that fat loss carries a higher target than muscle gain. It isn’t a mistake. Building muscle happens in a calorie surplus, where there’s spare energy around and protein is unlikely to be the limiting factor. Cutting is the opposite: energy is short, muscle is what the body is tempted to break down, and the extra protein is the insurance policy. Maintenance sits lowest because nothing is being defended or built — though the numbers in that column are still well above the 0.36 g/lb RDA, which is a deficiency floor for a sedentary adult, not a target for anyone training.

Two other things shift the number. Age is one: protein synthesis gets less responsive over time, so adults past about 50 do better at the upper end of their column. Training volume is the other, and it’s the one the calculator above already accounts for. Once you have your figure, the Cutting vs Bulking Calculator sets the calorie side of the same decision.

Four worked scenarios

Each card below is a real combination of weight, goal, and training load, with the target it produces. Select one to load it into the calculator at the top of the page, then change the weight to yours — the link carries the settings, so you can bookmark or share the one that matches you.

The cards make one thing concrete: the goal moves the number more than the scale does. Maintaining at 140 lb comes out at 84 g; cutting at 150 lb comes out at 135 g. Ten pounds of body weight apart, 51 g of protein apart — and nearly all of that gap is the goal rather than the body.

Best High-Protein Foods to Hit Your Target

A target in grams is only useful if the food gets you there. The table below ranks the protein sources in our database by grams of protein per 100 calories — the density figure that decides whether hitting 167 g costs you 900 calories or 1,900. Tap any column heading to re-sort.

Reading it in practice: the green band — white fish, shrimp, egg whites, poultry, nonfat dairy — is where the anchors of each meal should come from, because 30 g of protein from chicken breast costs about 150 calories while the same 30 g from cheddar costs nearly 500. Fattier proteins and legumes lower down aren’t bad choices; they just have to fit inside your calories rather than carry the day. For the same foods scored the PE Diet way — protein divided by non-protein energy — see the PE Diet food list, and for the wider ranking that folds in fiber and water, see the top 50 foods by satiety per calorie.

“High protein” alone doesn’t guarantee fullness, though — fat content, fiber, and water all change how filling a food is per calorie. To compare any two foods on that basis, score them in the Satiety Per Calorie Calculator; lean meats, low-fat dairy, and legumes consistently land in the high-satiety band, while fattier or processed proteins score lower.

When whole food can’t cover the target — a missed meal, a post-workout slot, a 150g+ day — a single scoop of powder fills the gap. Our best protein powders for satiety guide ranks options by protein per calorie and how full they keep you.

What Your Target Costs in Calories: the PE Ratio

A target in grams says nothing about the calories that arrive with it — and that attachment is what decides how quickly a diet can move. The measure for it is the protein-to-energy (PE) ratio: grams of protein divided by grams of non-protein energy (fat plus carbs, minus fiber). It’s the score the PE Diet Calculator returns for any food whose macros you type in. Here is the 167 g target from the worked example above, bought six different ways:

Nothing in that table is a bad food. What changes is what’s left over. On a 2,000-calorie day, covering 167 g from the top of the table costs about 840 calories and leaves roughly 1,160 for everything else — vegetables, fruit, grains, the oil you cook in. Covering it from the bottom of the table doesn’t fit in the day at all.

That leftover is the whole mechanism. Fat loss tracks the size of the calorie deficit you can actually hold, and whether you can hold one is mostly a question of hunger. High-PE foods help twice: they reach the protein number for fewer calories, and protein is the most filling macro per calorie, so the calories you do spend buy more fullness. Let the ratio fall and the same protein target swallows the budget, leaving a choice between missing your protein and abandoning the deficit. How fast the fat actually comes off still depends on starting body fat, training, and consistency — but the plate is the part of it you control.

Two things to do with that. Score the foods you eat most in the PE Diet Calculator and swap the two or three that come out lowest; and set the deficit itself with the Calorie Deficit Calculator, which turns a target rate of loss into a daily calorie figure. The PE Diet Guide covers the approach end to end.

Protein Timing: Pre-Workout, Post-Workout, and Across the Day

Timing is where most protein advice gets loud and the evidence gets quiet. In the order the research supports:

The anabolic window is a door, not a keyhole

The old rule — protein within 30 minutes of the last rep or the session is wasted — hasn’t survived scrutiny. A 2013 meta-analysis in the Journal of the International Society of Sports Nutrition(Schoenfeld, Aragon & Krieger) found the apparent advantage of post-exercise protein largely disappeared once total daily protein was equated between groups: the trials showing a timing effect were mostly comparing a higher-protein day against a lower-protein one. The same authors put the practical window at a few hours either side of training rather than minutes.

Pre-workout: an ordinary meal does the job

A protein-containing meal one to three hours before you train leaves amino acids circulating through the session and well past it, which is exactly what stretches the window on the other side. There’s nothing special to eat — 25–40 g of whatever your usual source is. Train shortly after lunch and the post-workout question has largely answered itself.

Post-workout: within a few hours, not a few minutes

For most people, 25–40 g of protein in the next meal covers it. Two situations tighten that up: training fasted — early morning, or inside an eating window, which the 16:8 fasting macro calculator plans around — where nothing is circulating and the post-session meal is the day’s first protein; and training twice in a day, where recovery time is genuinely short. Otherwise the shaker in the car park is convenience, not physiology.

Across the day: three to five doses beat one big one

Muscle protein synthesis responds to a dose, and the response saturates, which is why a 2018 review by Schoenfeld and Aragon suggested spreading intake over at least four meals at roughly 0.4 g/kg each. At 84 kg (185 lb) that’s about 34 g a meal; the calculator’s per-meal figure sits a little above it, because a fat-loss target sits above the 1.6 g/kg that arithmetic is built on. In practice, the meal that sinks most people’s total is breakfast — cereal or toast lands near 10 g where the rest of the day’s meals land near 40. The high-protein meal plan for fat loss shows a full day built the other way round.

To see that spread applied to a full week, the high-protein meal plan for fat loss builds seven days around roughly 1g per pound — every meal with its macros, its PE score, and its satiety-per-calorie score, plus a day-by-day macro table and a grocery list.

Before bed: optional, and it comes out of the total

Protein eaten before sleep is digested and used overnight rather than sitting idle (Res et al., Medicine & Science in Sports & Exercise, 2012, using 40 g of casein). If you like a pre-bed snack, a slow-digesting protein is a reasonable one. The caveat that matters: it belongs inside your daily target, not added to it.

None of this is a prescription — individual needs vary with age, training, medication, and health conditions, and a doctor or dietitian is the right person to ask about your own. New to building a protein-forward plate? The PE Diet Guide walks through how to anchor every meal with protein without counting every gram.