Protein Calculator for Weight Loss & Muscle
This protein calculator estimates how much protein you need each day based on your current weight, activity level, and goals, giving you a clear starting point to help you lose weight or build muscle effectively.
Protein Calculator
Enter your details to find your daily protein target.
How to use this protein calculator
Whether you want to lose weight, build muscle, or maintain your results, this protein calculator is designed to guide you toward your goals. It factors in your current weight, goal, and activity level to provide a practical daily protein target — helping you eat with intention and fuel your progress.
Simply enter your details and hit “Calculate.” In seconds, you’ll get a personalized protein goal in grams per day and grams per meal.
Including more protein in your diet can help you stay satisfied longer, support weight loss, and build muscle when paired with regular exercise. Studies show that your current body size is a reliable starting point for determining your daily protein needs — because it reflects the energy your body uses right now as you work toward your goals.
How to choose your goal
Your protein needs depend on what you’re working toward, which is why this calculator factors in your goal:
- Lose weight gives you a protein target to support fat loss while helping you maintain or build muscle. Higher protein is especially important here to protect your metabolism as you reduce calories.
- Maintain weight gives you a protein target to sustain energy, weight, and muscle over time. This aligns more closely with general dietary guidelines.
- Build muscle gives you a higher protein target to help your body repair and grow stronger after resistance training. This requires the most protein of the three goals.
How to choose your activity level
Your activity level helps fine-tune your protein target. The more active you are, the more protein your body needs to recover and maintain muscle.
How does protein help you lose weight?
Eating more protein can support weight loss in several meaningful ways. Understanding how it works helps you use your protein target more effectively.
- Keeps you fuller for longer. Protein is the most satiating macronutrient. It slows digestion and reduces appetite hormones, helping you naturally eat less throughout the day.
- Reduces cravings. Higher protein intake has been shown to cut cravings and reduce late-night snacking — two of the most common barriers to maintaining a calorie deficit.
- Boosts calorie burn. Protein has the highest thermic effect of any macronutrient — up to 30% of its calories are burned during digestion itself. That’s compared to just 5–10% for carbs and 0–3% for fats.
- Preserves muscle while losing fat. Without enough protein, your body may break down muscle for energy during weight loss — slowing your metabolism and making long-term results harder to maintain.
- Supports muscle growth. Even in a calorie deficit, adequate protein intake can support lean muscle development when paired with resistance training.
Using a GLP-1?
This protein-preserving effect is especially important if you’re losing weight with a GLP-1 medication like compounded semaglutide or tirzepatide. Because GLP-1s can reduce appetite significantly, ensuring you’re hitting your protein target becomes even more critical to preserving muscle mass as the scale drops.
How much protein to eat to lose weight?
Research shows that most people need 1.2–1.6 grams of protein per kilogram of body weight per day to lose weight effectively while preserving lean muscle mass.
Example
Someone who weighs 150 pounds (68 kg) would need approximately 80–110 grams of protein per day to support healthy weight loss.
For comparison, the standard daily recommendation for adults is just 0.8 grams per kg — or roughly 55 grams per day for that same person. When weight loss is the goal, aiming for 50–100% more protein than that baseline helps protect muscle and keep your metabolism strong.
The exact amount you need depends on your body composition, lifestyle, and activity level:
- If you work out regularly or lift weights, you may benefit from up to 2 grams of protein per kg per day to support recovery and muscle growth.
- If you’re using a GLP-1 medication or following a lower-calorie plan, aim for the higher end of the 1.2–1.6 g/kg range to protect muscle as you lose fat.
Can you eat too much protein?
Yes — but for most healthy adults, it’s rarely something to worry about. Research has found that daily intakes up to 2–2.2 grams of protein per kg of body weight are considered safe for people with normal kidney function. Even at the higher end, studies haven’t found harmful effects on kidney, liver, or bone health in otherwise healthy adults.
Potential issues become more likely when protein intake regularly exceeds 3–4 grams per kg per day, especially without adequate hydration or in people with pre-existing kidney conditions. At those levels, the body can’t efficiently use the excess protein, and it offers no additional benefit for weight loss or muscle growth.
For most people, eating 1.2–2 grams of protein per kg of body weight per day is both safe and effective, supporting weight management, muscle maintenance, and overall health without approaching the “too much” threshold.
Important
If you have kidney disease or another condition that affects how your body processes protein, speak with a healthcare provider before making significant dietary changes.
How does protein help you build muscle?
Protein is the foundation of muscle growth. Getting enough of it — and spreading your intake throughout the day — helps you train harder, recover faster, and see more strength and definition over time.
- Kick-starts muscle repair and growth after exercise by supplying amino acids that rebuild damaged muscle fibers stronger than before.
- Supports recovery by reducing post-workout soreness and helping your body adapt more efficiently to training so you can stay consistent.
- Improves strength and performance over time by fueling the muscle protein synthesis process that drives long-term gains.
- Reduces muscle breakdown: even during calorie deficits, adequate protein helps preserve lean mass so you maintain tone and strength.
Studies show that consuming 20–40 grams of high-quality protein after resistance training maximizes muscle protein synthesis. Spreading protein evenly across meals is also far more effective than consuming it all in one sitting.
How much protein to build muscle?
Research suggests that 1.6–2.2 grams of protein per kg of body weight per day is the sweet spot for supporting muscle growth when paired with regular resistance training. That’s at least twice the standard daily recommendation for adults.
Weight Loss
Maintenance
Build Muscle
Your needs can vary depending on training intensity, age, and calorie intake:
- Beginners and older adults may benefit from the higher end of the range (around 2.0–2.2 g/kg) to stimulate muscle growth more effectively.
- Regular lifters or athletes can often maintain progress at 1.6–1.8 g/kg, as long as total calories and timing stay consistent.
- During calorie deficits, aim for the higher end to preserve muscle while losing fat.
Best protein sources for weight loss
Protein-rich foods help you stay full, preserve muscle, and support a healthy metabolism. When it comes to weight loss, choose options that are low in saturated fat and added sugar.
Here’s how much protein common foods provide per 100 grams (cooked), according to the USDA’s FoodData Central:
High-protein snacks for weight loss
Smart snacking helps you stay on track between meals and keep hunger in check. These convenient options deliver a solid hit of protein to help you hit your daily target:
Greek Yogurt
Hard-Boiled Eggs
Roasted Edamame
Turkey Jerky
Mixed Nuts
Protein Shake
Steer clear of options with high added sodium, sugar, and saturated fats — all of which can derail your weight loss progress even if the protein count looks good on paper.
How to get 100 grams of protein a day
Getting 100 grams of protein a day doesn’t have to mean eating chicken at every meal. With a few simple habits, you can hit your target without overthinking it:
Include protein at every meal
Aim for a palm-sized portion of protein-rich food at breakfast, lunch, and dinner. This alone often gets you to 75–90g before snacks.
Plan and prep ahead
Keep ready-to-eat options on hand (hard-boiled eggs, canned tuna, Greek yogurt) for busy days when cooking isn’t realistic.
Mix up your sources
Rotate between lean meats, seafood, eggs, beans, tofu, lentils, and edamame for variety and nutritional balance.
Add small protein boosts
Stir protein powder into smoothies, sprinkle nuts and seeds onto salads, or swap low-protein snacks for high-protein alternatives throughout the day.
Glo weight loss and protein
Eating enough protein can make weight loss easier — it helps control hunger, preserve muscle, and keep your metabolism strong. But every weight loss journey is different, and sometimes reaching your goals takes more than nutrition alone.
The Glo membership makes clinically guided weight loss more accessible and sustainable. It combines FDA-approved GLP-1 medications like compounded semaglutide and tirzepatide with ongoing care from licensed providers, 1-on-1 health coaching, and tools for tracking progress — if treatment is appropriate for you.
Members also receive insurance support, regular check-ins, and ongoing guidance to help build lasting habits. To see if Glo is a good fit for you, start by completing our free online quiz. No appointments, no waiting rooms — just a personalized care plan built around your goals.
Start your GLP-1 weight loss journey today
Lose 15–20% of your body weight in a year with FDA-approved GLP-1 medications, 100% online, insurance assistance included.
Real members, real results
Don’t just take it from us — our members see and feel the difference. These members were compensated for sharing their stories.
*Average weight loss in 1 year is 15–20% (vs ~2–3% with diet and exercise alone). Based on studies in non-diabetics with obesity or overweight plus a weight-related condition, combined with diet and exercise. Members may have been compensated.