Preserves Muscle
During a calorie deficit, your body can break down muscle for energy. Higher protein intake (1.2–2.0 g/kg) signals your body to preserve lean tissue and prioritize fat loss instead.
Strong through every step.
Protein Calculator for Weight Loss
Calculate how much protein you need to preserve muscle while losing fat. Higher protein during a calorie deficit keeps you full and protects lean mass.
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Plan protein with clarity.
Plan protein with clarity.
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Goal-specific target
Practical meal planning
Evidence-based guidance
YOUR DAILY STARTING POINT
A protein target that fits your plan.
A few details about you.
A clearer target for every day.
Enter your details
Adjust the fields, then calculate your daily protein target below.
THE WHY BEHIND YOUR TARGET
Why Protein Matters for Weight Loss
Increases Satiety
Protein is the most satiating macronutrient. Eating more protein helps you feel full longer, reducing cravings and making it easier to stick to your calorie deficit.
Boosts Metabolism
Protein has the highest thermic effect of food — your body burns 20–30% of protein calories just digesting it, compared to 5–10% for carbs and 0–3% for fats.
KEEP THE STRENGTH YOU BUILD
Protein Intake During a Calorie Deficit
When eating fewer calories than you burn, your protein needs actually increase compared to maintenance. Research supports 1.2–2.0 g per kg of body weight per day during a deficit, with the higher end (1.6–2.0 g/kg) being especially beneficial if you are also resistance training.
Combining higher protein with resistance training during a calorie deficit is the most effective strategy for losing fat while maintaining (or even gaining) muscle mass — a process sometimes called body recomposition.
1.2 g/kgModerate deficit
1.6 g/kgTraining + deficit
2.0 g/kgAggressive cut
SEE THE RANGE AT A GLANCE
Weight-Loss Protein Targets by Body Weight
| Body Weight | Moderate Deficit | Training + Deficit | Aggressive Cut |
|---|---|---|---|
| 60 kg / 132 lb | 72 g | 96 g | 120 g |
| 75 kg / 165 lb | 90 g | 120 g | 150 g |
| 90 kg / 198 lb | 108 g | 144 g | 180 g |
| 105 kg / 231 lb | 126 g | 168 g | 210 g |
Moderate deficit uses 1.2 g/kg, training plus deficit uses 1.6 g/kg, and aggressive cut uses 2.0 g/kg.
MAKE THE RANGE YOUR OWN
How to Choose Your Target
Start where you are
Start near 1.2-1.6 g/kg if your calorie deficit is modest and you are not doing much strength training. This is usually enough to improve satiety while keeping meal sizes realistic.
Account for training
Move toward 1.6-2.0 g/kg if you lift weights, are already lean, are losing weight quickly, or notice strength dropping during the cut. In these cases, preserving lean mass is more important than keeping protein at a minimum.
Keep it realistic
If body fat is high, entering body fat percentage in the calculator can prevent an inflated target by using an adjusted weight. That keeps the target useful without turning the diet into an unnecessarily high-protein plan.
TURN THE TARGET INTO MEALS
Food and Meal Guides for Weight Loss
High-Protein Low-Calorie Foods
Foods ranked by protein per calorie with source-backed data.
Explore guideLow-Calorie High-Protein Meals
Meal templates, recipes, and product shortcuts for dieting.
Explore guideHigh-Protein Diet for Weight Loss
A complete guide to using protein inside a calorie deficit.
Explore guide UNDERSTAND THE MATH
Formula Used for Weight-Loss Protein
The weight-loss calculator uses a higher protein range than maintenance because calorie deficits increase the risk of muscle loss and hunger.
Effective weightin kilograms×g/kg targetfor your deficit=Daily proteinin grams
| Input | Formula | How it is used |
|---|---|---|
| Moderate deficit | effective body weight in kg × 1.2 g/kg | Best when weight loss is slow, training volume is low, or appetite is manageable. |
| Training + deficit | effective body weight in kg × 1.6 g/kg | The default target when strength training and fat loss happen together. |
| Aggressive cut | effective body weight in kg × 2.0 g/kg | Useful when dieting quickly, already lean, or trying hard to preserve strength. |
If body fat percentage is above 30% and entered in advanced settings, the calculator uses adjusted body weight to avoid over-shooting.
FROM RANGE TO ROUTINE
Worked Example for Weight Loss
90 KG · LIFTING · FOUR MEALS
For a 90 kg person cutting calories while lifting:
- 1. Moderate target: 90 kg × 1.2 g/kg = 108 g/day.
- 2. Training target: 90 kg × 1.6 g/kg = 144 g/day.
- 3. Aggressive cut target: 90 kg × 2.0 g/kg = 180 g/day.
- 4. Across four meals, 144 g/day is about 36 g per meal.
A practical starting target is 140-160 g/day, then adjust if hunger, recovery, or adherence suffers.
THE RIGHT TOOL FOR YOUR QUESTION
When to Use This Calculator
Use this page for fat loss
Best when calorie deficit and lean-mass retention are the primary concerns.
Explore calculatorUse calorie deficit calculator for pace
Better when you need daily calories, weekly loss, and time-to-goal.
Explore calculatorUse cutting calculator for bodybuilding cuts
Better when you need a structured cut with macros and timeline.
Explore calculatorUse recomp calculator if weight is stable
Better when you want fat loss and muscle gain without a large scale change.
Explore calculator KEEP LEARNING
Matching Guides
THE EVIDENCE BEHIND THE RANGE
Sources reviewed
- International Society of Sports Nutrition Position Stand: diets and body composition - Journal of the International Society of Sports Nutrition / PMC
- International Society of Sports Nutrition Position Stand: protein and exercise - Journal of the International Society of Sports Nutrition
- Dietary Reference Intakes summary tables - National Academies Press
A LITTLE MORE CLARITY
Frequently Asked Questions
Why is protein important for weight loss?
Higher protein intake during a calorie deficit helps preserve lean muscle mass, increases satiety (feeling full), and has a higher thermic effect (your body burns more calories digesting protein than fats or carbs). This combination supports fat loss while maintaining metabolism.
How much protein do I need while losing weight?
During a calorie deficit, aim for 1.2-2.0 g of protein per kg of body weight per day. The higher end (1.6-2.0 g/kg) is especially beneficial if you're also resistance training, as it helps maximize muscle retention while losing fat.
Will eating more protein help me lose belly fat?
Protein doesn't target belly fat specifically — no food can spot-reduce fat. However, higher protein intake supports overall fat loss by increasing satiety, preserving muscle mass, and slightly boosting metabolism. Combined with a calorie deficit and exercise, it can help reduce body fat including abdominal fat.
Should I eat protein before or after a workout for fat loss?
Total daily protein intake matters more than specific timing for fat loss. That said, having a protein-rich meal or snack within a few hours of training can support recovery and muscle preservation. Focus on spreading protein across your meals throughout the day.
Disclaimer: This calculator provides estimates based on published research. Individual results vary. Consult a registered dietitian or healthcare provider for personalized guidance, especially if you have health conditions.