# Protein Calculator: How Much Protein Do You Actually Need? (2026)

> Free protein calculator with goal presets — cutting, bulking, GLP-1 medication, hard gainer. Plus a reference table by bodyweight and the per-meal split most people get wrong.

Canonical: https://www.mycallie.app/en/blog/protein-calculator
Published: 2026-05-27 · Updated: 2026-05-27
Author: Md Sadab Wasim · Source: https://www.mycallie.app

If you came here from Google, you want a number. Here it is.

## The 30-second answer

**Take your bodyweight in kg and multiply by 1.2 to 1.6.** That's your daily protein target in grams. If you're cutting, on a GLP-1, or trying to build muscle, multiply by 1.6 to 2.2 instead.

Skip the math:

[Interactive protein calculator — use it on the page.]

## Why the RDA (0.8 g/kg) is too low for most adults

The US RDA for protein — 0.8 g/kg/day — is the amount needed to prevent deficiency in sedentary adults. It is not the amount needed to optimize body composition, recovery, or healthy aging.

A 2022 ISSN position stand and decades of follow-up research consistently land on these working numbers for active adults:

| Goal | Protein (g per kg bodyweight) | Protein (g per lb) |
|---|---|---|
| Sedentary maintenance (RDA floor) | 0.8 | 0.36 |
| General health, light activity | 1.2–1.4 | 0.55–0.64 |
| Recreational lifting, weight maintenance | 1.4–1.8 | 0.64–0.82 |
| Cutting (calorie deficit) | 1.6–2.4 | 0.73–1.09 |
| Muscle gain (calorie surplus) | 1.6–2.2 | 0.73–1.00 |
| On a GLP-1 (Ozempic / Wegovy / Mounjaro) | 1.6–2.0 | 0.73–0.91 |
| Hard gainer (struggling to gain) | 2.2–3.4 | 1.00–1.55 |

## Daily protein targets — quick reference

Midpoint targets in grams per day, by bodyweight and goal.

### Maintenance (1.4 g/kg)

| Bodyweight | Daily protein |
|---|---|
| 50 kg / 110 lb | 70 g |
| 60 kg / 132 lb | 84 g |
| 70 kg / 154 lb | 98 g |
| 80 kg / 176 lb | 112 g |
| 90 kg / 198 lb | 126 g |
| 100 kg / 220 lb | 140 g |

### Cutting or GLP-1 (2.0 g/kg)

| Bodyweight | Daily protein |
|---|---|
| 50 kg / 110 lb | 100 g |
| 60 kg / 132 lb | 120 g |
| 70 kg / 154 lb | 140 g |
| 80 kg / 176 lb | 160 g |
| 90 kg / 198 lb | 180 g |
| 100 kg / 220 lb | 200 g |

### Hard gainer (2.8 g/kg)

| Bodyweight | Daily protein |
|---|---|
| 50 kg / 110 lb | 140 g |
| 60 kg / 132 lb | 168 g |
| 70 kg / 154 lb | 196 g |
| 80 kg / 176 lb | 224 g |
| 90 kg / 198 lb | 252 g |

## The per-meal split most people get wrong

Daily total matters most, but distribution is a real second-order lever. Research on muscle protein synthesis (MPS) suggests:

- The MPS response to a single meal plateaus around **30–40 g** of high-quality protein for most adults. Older adults need the higher end because of anabolic resistance.
- Going much higher in a single meal (say, 80 g at dinner) is not "wasted" — the extra protein is still used for general metabolism — but it doesn't stack additional muscle-building benefit on that meal.
- Splitting your daily target into 3–4 meals of 30–40 g each is the practical sweet spot.

A 70 kg adult eating 140 g/day:

| Meals/day | Per meal |
|---|---|
| 3 meals | ~47 g (a little above the MPS ceiling — fine) |
| 4 meals | ~35 g (right in the sweet spot) |
| 5 meals (snacks count) | ~28 g (slightly under — still works) |
| 1 meal (OMAD) | 140 g (a lot at once; OMAD is not optimal for muscle, but works for weight management) |

## Special case: protein on a GLP-1 medication

GLP-1 drugs (Ozempic, Wegovy, Mounjaro, Zepbound) suppress appetite so strongly that most users involuntarily drop total food intake by 20–35%. That's good for weight loss but bad for muscle if protein drops proportionally.

- **Set a 1.6 g/kg floor, not a percentage of calories.** A grams-based floor is harder to undercut on low-appetite days.
- **Front-load protein.** Many GLP-1 users eat well at breakfast and lunch but lose interest by dinner. Get 50–60% of your daily protein in by 2 pm.
- **Liquid protein when solid food won't go down.** A whey or pea-protein shake delivers 25–30 g in 250–300 ml.

For the full GLP-1 nutrition framework, see [GLP-1 diet plan: what to eat on Ozempic, Wegovy & Mounjaro](/blog/glp-1-diet-plan-ozempic-wegovy-mounjaro).

For the lean-mass side specifically — what the 2025 four-society advisory recommends and why per-meal distribution is the real constraint — see [GLP-1 and muscle loss](/blog/glp-1-muscle-loss-protein).

## Special case: the hard gainer

If you're consistently trying to gain weight and lifting hard, the upper end of the protein range (2.2–3.4 g/kg) helps drive lean-mass accrual specifically rather than just total weight. Combine with a calorie surplus of 250–500 kcal/day. The full playbook is in our [hard gainer guide](/blog/healthy-weight-gain-guide).

## How to actually hit the number

The protein gap most adults face is not strategy, it's tracking. People reliably under-log meat portions and forget to count protein in carby foods (bread has 3–4 g per slice; pasta has 7–8 g per cooked cup). Two compounding errors:

1. Under-logging protein on photos (chicken portions look smaller than they are).
2. Forgetting incidental protein in side dishes.

The fix is a tracker that recognizes whole meals (not single items) and lets you adjust portion size after the fact. Callie's photo + voice logging is built for this — and the [review-before-confirm step](/blog/how-to-track-calories-from-a-photo) catches portion misjudgments before they bake into your weekly average.

## Common protein-rich foods, sorted by g per 100 kcal

When you're in a calorie deficit, density matters. These foods give you the most protein per calorie spent:

| Food | Protein per 100 kcal |
|---|---|
| Egg whites | ~21 g |
| Whey isolate | ~22 g |
| Cod, plain | ~21 g |
| Chicken breast, skinless | ~18 g |
| Greek yogurt 0% | ~17 g |
| Tofu, firm | ~12 g |
| Lentils, cooked | ~7 g |
| Whole eggs | ~8 g |
| Almonds | ~3.5 g |

## When to recalculate

Your protein target follows your bodyweight, so every 5 kg / 10 lb of weight change is worth a recheck. Also recheck if you:

- Start or stop a GLP-1 medication
- Switch from maintenance to a cut or surplus
- Start strength training after a sedentary period
- Cross age 65 (older adults benefit from the upper end of the range due to anabolic resistance)

Bodyweight in kg × 1.6 is a defensible target for almost any active adult. If you're cutting or on a GLP-1, push it to 2.0. Hit that number 5–6 days a week — the result compounds far more than perfect macro hair-splitting on any single day.