Body recomposition calculator: calories and macros to build muscle and lose fat at once

Why recomp calories sit at maintenance, not in a deficit or surplus

Most calorie tools force you into one lane: eat below TDEE to lose fat, or above it to gain muscle. Recomposition is the awkward third option that refuses to pick. You want both outcomes at once, and the calorie strategy that makes both possible is to hover right around your maintenance number.

The logic is easier to see once you separate the two things calories control. Total calories relative to TDEE decide the direction of your body weight — up, down, or flat. Protein plus a hard training stimulus decide what that weight is made of. When you sit at maintenance, your scale weight barely moves, but underneath it two things can happen simultaneously: muscle tissue is built (fueled by protein and the training signal) and fat tissue is drawn down (fueled by the fact that your body preferentially burns fat when muscle is being spared by high protein and heavy lifting). The scale looks still while the composition shifts. That is recomp.

This is why a body recomposition calculator does not ask you to choose a deficit percentage the way a cutting calculator does. Its job is to pin your intake to maintenance — or a whisper below it for people carrying more body fat — and then get protein high enough that the muscle-building side of the ledger actually happens. Overshoot into a real surplus and you gain fat you did not need to; drop into a real deficit and you blunt the muscle-building you came for. The narrow band around TDEE is the whole point.

Who recomp actually works best for

Recomposition is not equally effective for everyone, and an honest calculator page should say so up front. The people who get the most dramatic simultaneous muscle-gain-and-fat-loss results fall into a few clear groups.

Beginners in their first year of training see the strongest recomp of anyone. New lifters build muscle fast and their bodies are highly responsive to a training stimulus, so even at flat maintenance calories they can add noticeable muscle while shedding fat for months. This is the classic 'newbie recomp' and it is real.

Returning lifters coming back after a layoff get a similar effect through muscle memory — retained myonuclei let them regain lost muscle far faster than they built it originally, which pairs beautifully with a maintenance-calorie fat loss.

People starting at a higher body-fat percentage have plenty of stored energy to fuel muscle growth, so their bodies can build tissue while running a mild deficit. For this group a slight deficit of 5–10% below TDEE often out-performs strict maintenance, because the extra body fat covers the muscle-building energy cost internally.

Who recomp is slowest for: lean, experienced lifters. If you are already an advanced trainee at 12% body fat, there is little fat to lose and your muscle-building ceiling is low, so a recomp inches along. That group is usually better served by dedicated bulk and cut phases. The calculator will still give you honest numbers — just set your expectations to 'slow and steady' rather than transformation.

Recomp calorie and macro targets by starting point

This is the core of the body recomposition calculator. Find the row that matches your body-fat starting point, and read across for how to set calories against your TDEE, where to anchor protein, and what to watch for. Protein is given per kilogram of body weight; if you carry a lot of fat, anchor it to a target (lean) body weight instead of scale weight so you do not chase an unnecessarily high number.

Notice protein stays high across every row while the calorie setting drifts from flat maintenance down to a mild deficit as body fat climbs. Protein is the constant; the small energy gap is the variable. Nobody on this table runs a surplus — that would trade recomp for a bulk.

How to calculate calories for body recomposition: a full worked example

Numbers make this concrete, so let me run one end to end the way I would for myself. Take a sample lifter: a 70 kg (154 lb) person at roughly 18% body fat with a TDEE of 2,100 kcal (from the calculator above, using their weight, height, age, and an honest 'moderately active' setting). They fall in the average-body-fat row, so we will target maintenance for now and hold the option to nudge down later.

Step 1 — set calories. Recomp intake equals maintenance, so the target is 2,100 kcal/day. No deficit, no surplus. That is the whole 'how many calories' answer for a straightforward recomp.

Step 2 — set protein. We anchor at 2.0 g per kg: 70 kg × 2.0 = 140 g of protein per day. At 4 kcal per gram, that is 560 kcal committed to protein.

Step 3 — set fat. We use 25% of total calories: 2,100 × 0.25 = 525 kcal from fat. At 9 kcal per gram, that is 525 ÷ 9 ≈ 58 g of fat per day.

Step 4 — carbs fill the rest. Subtract protein and fat calories from the total: 2,100 − 560 − 525 = 1,015 kcal left for carbohydrate. At 4 kcal per gram, that is 1,015 ÷ 4 ≈ 254 g of carbs per day.

So the full recomp prescription for this lifter is 2,100 kcal, 140 g protein, 58 g fat, 254 g carbs. If after 3–4 weeks the scale is dead flat but the mirror and tape are not showing the fat loss they want, we drop to −5% — 2,100 × 0.95 ≈ 1,995 kcal — by trimming about 25 g of carbs (roughly 100 kcal), leaving protein and fat untouched. Everything else about the plan stays identical. That is the entire adjustment loop: hold protein, move the small carb lever, judge by a 3–4 week trend rather than a daily reading.

Recomp mistakes that quietly kill your results

These are the patterns I see sink otherwise reasonable recomp attempts. Almost all of them come from misjudging one of the two levers — calories or protein — or from measuring progress the wrong way:

• Accidentally running a surplus. 'Maintenance' built on an unverified TDEE is often 200–300 kcal too high, which turns your recomp into a slow bulk. Verify your maintenance by eating at it for two weeks and watching the weekly average before you trust the number.
• Under-eating protein. Anything below 1.6 g/kg and the muscle-building half of the recomp stalls. This is the single most common failure — people nail the calories and forget the protein is what makes it a recomp rather than just a flatline.
• Judging by the scale. Recomp weight barely moves by design. If your only measuring tool is body weight, you will conclude nothing is happening and quit. Use a tape measure, progress photos, and your training logbook instead.
• Not progressing the training. Recomp needs a genuine muscle-building stimulus — progressive overload, week over week. Coasting at the same weights and reps gives your body no reason to build, so the maintenance calories just maintain.
• Impatience. Recomp is slower than a dedicated bulk or cut because you are asking for two things at once from a flat energy budget. Give it 12–16 weeks before judging, and expect quarters, not weeks, if you are already lean and experienced.

Three of these five are really the same error wearing different hats: trusting the scale over the tape and logbook. Fix your measurement habit and most recomp frustration disappears.

The training side: why recomp lives or dies on progressive overload

A body recomposition calculator sets your food, but food is only half the equation, and on a recomp it is arguably the smaller half. At maintenance calories your body has no strong energy signal telling it to change — you are not in the surplus that shouts 'grow' or the deficit that shouts 'shrink.' The signal to build muscle instead has to come almost entirely from training. That makes progressive resistance training the engine of recomp, not an accessory to it.

Progressive overload — adding reps, weight, or quality sets over time — is the specific stimulus that tells your body to lay down new muscle even without a calorie surplus. This is well supported in the resistance-training literature: research on concurrent muscle gain and fat loss — including randomized trials like Longland and colleagues' 2016 study, where higher protein plus hard training drove lean-mass gain and fat loss at the same time — consistently finds that the trainees who recomp successfully are the ones running a real progressive-overload program with adequate protein, not those who simply eat 'clean' at maintenance. The food creates the conditions; the training creates the muscle.

Practically, that means your recomp program should look like any serious hypertrophy program: compound movements as the base, 10–20 hard sets per muscle group per week, most sets taken within a couple reps of failure, and a logbook that shows numbers climbing over the months. If your lifts are not slowly improving, your recomp is not really happening no matter how precise your macros are. When people tell me their recomp 'stopped working,' the culprit is almost never the calorie math — it is a training program that stopped getting harder.

Putting your recomp plan together

The whole method comes down to a short, repeatable sequence. Get your TDEE from the calculator above and verify it is real by eating there for two weeks while watching your weekly average weight — an unverified maintenance number is how recomps secretly become bulks or cuts. Set calories at that maintenance figure if you are lean or average, or 5–10% below it if you carry more body fat and want faster visible fat loss. Anchor protein at 1.8–2.2 g per kg and defend that number every day; it is the constant that makes the muscle side happen. Let fat sit around 20–30% of calories and carbs fill whatever remains, adjusting carbs up on hard training days if you like. Then train with genuine progressive overload and judge your progress by the tape measure, photos, and logbook rather than the scale, over a 12–16 week window.

Done that way, recomp stops feeling like a magic trick and becomes what it actually is: maintenance calories plus high protein plus hard, progressive training, measured patiently. If you want to go deeper on any piece of it, our companion pages break down the pieces — what body recomposition is and the science behind it, the food choices of a good recomp diet, the exact protein-carb-fat split from the macro calculator, how to nail down the maintenance number that anchors everything, and where recomp shades into a dedicated muscle-gain phase. The calculator on this page ties them together into a single set of daily targets. Start there, verify your maintenance, defend your protein, and let a slow scale be exactly what a successful recomp is supposed to look like.