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

Start with your current body weight. You can enter it in pounds or kilograms, whichever feels natural. Use your actual weight, not your goal weight. The calculator is estimating what your body needs right now to function and perform at your current size.

Age matters because protein needs shift slightly as you get older. Adults over 60 generally need more protein per pound of body weight than younger adults do, mainly because the body becomes less efficient at using dietary protein to maintain and build muscle tissue. It's called anabolic resistance, and it's a real thing.

For activity level, pick the option that best describes your average week, not your best week. The categories typically range from sedentary (desk job, minimal exercise) all the way up to very active (daily intense training, physically demanding work). Be realistic and you'll get a more useful number.

Once the calculator runs, you'll see a daily protein target expressed in grams. That's your total for the day across all meals and snacks combined, not per meal.

The number is a recommended range, not a hard law. Getting within 10 to 15 grams on either side is totally fine. What matters more than hitting an exact number every single day is hitting somewhere close to it consistently over time.

If the result feels surprisingly high, that's normal. Most Americans eat far less protein than research suggests is optimal, especially people who are active or trying to change their body composition. The number the calculator gives you is backed by current nutrition science, and it's probably higher than what you've been eating.

Here's a quick reference to translate the science into real numbers based on body weight. These ranges cover the spectrum from minimum daily needs to performance-focused targets.

A common rule of thumb you'll see in fitness communities is to eat about 1 gram of protein per pound of body weight. That lands in the upper moderate range and works well as a simple daily target for most active adults. It's not perfect for everyone, but it's easy to remember and rarely leads anyone astray.

Protein needs increase significantly during pregnancy and while breastfeeding. The body is doing a lot more work, and dietary protein supports fetal development, placental tissue, increased blood volume, and milk production.

During pregnancy, most guidelines recommend an additional 25 grams of protein per day above baseline needs, especially in the second and third trimesters when fetal growth accelerates. That puts many pregnant women in the range of 70 to 100 grams per day depending on pre-pregnancy weight and activity.

For breastfeeding, the recommendation is similar, roughly an extra 25 grams per day on top of normal needs. Some research suggests the actual demand may be even higher for women who are exclusively breastfeeding, particularly in the first few months. If you're pregnant or nursing, it's always worth talking to your OB or a registered dietitian for personalized guidance since individual needs can vary.

If you're not exercising regularly and your daily life doesn't involve much physical labor, the standard RDA of 0.8 grams per kilogram is technically sufficient to prevent protein deficiency. For a 150-pound (68 kg) adult, that works out to about 54 grams per day.

That said, a lot of nutrition researchers argue that even sedentary adults benefit from eating more than the RDA, somewhere around 1.0 to 1.2 grams per kilogram, because the RDA represents a floor, not an ideal. Getting a bit more protein tends to support better satiety, muscle maintenance as you age, and overall metabolic health even without formal exercise.

This category covers a wide range of people: someone who walks a lot, does yoga regularly, lifts weights a couple times a week, or has a job that keeps them on their feet. You're not training hard every day, but you're not sedentary either.

A target of 1.0 to 1.2 grams per kilogram covers the increased demand from regular movement without overshooting. For a 165-pound (75 kg) person, that's roughly 75 to 90 grams of protein per day. Spread across three meals, that's very achievable with normal food choices and doesn't require protein shakes or obsessive tracking.

If you're in this category and trying to slowly improve your body composition over time, nudging toward the higher end of this range, or even into the 1.4 to 1.6 range, is a reasonable move.

For people doing serious resistance training, endurance sports, team sports, or any combination of the above, protein needs jump substantially. The 1.6 to 2.0 grams per kilogram range is the most well-supported target in the sports nutrition literature for maximizing muscle protein synthesis and recovery.

A 180-pound (82 kg) athlete training five or six days a week would be looking at roughly 130 to 165 grams of protein per day. That's a significant amount of food, and it's why most serious athletes pay close attention to their protein sources throughout the day rather than trying to cram it all into one or two meals.

Timing matters at this level too. Spreading protein intake across three to five meals or snacks, with roughly 30 to 40 grams per sitting, tends to produce better muscle protein synthesis outcomes than eating the same total in one or two large meals. It's not a deal-breaker if you can't eat perfectly spaced meals, but it's worth keeping in mind.

Protein is probably the most powerful tool in a weight loss diet. It keeps you fuller longer, has the highest thermic effect of any macronutrient (meaning your body burns more calories just digesting it), and it helps preserve lean muscle mass when you're eating in a calorie deficit.

Losing muscle along with fat is a real risk during aggressive dieting, and higher protein intake is the main dietary strategy to minimize it. Most research supports eating 1.6 to 2.4 grams of protein per kilogram of body weight during a cut, with the higher end being more protective when you're eating very few calories or losing weight quickly.

A practical approach: keep protein high and consistent even as you adjust calories. Protein should be the last macronutrient you cut when reducing intake. Slash carbs or fats first, and let protein stay anchored.

Building muscle requires two things working together: a training stimulus and enough protein to support repair and growth. You can lift all you want, but if you're chronically under-eating protein, muscle gain stalls.

The research-backed target for hypertrophy is 1.6 to 2.2 grams per kilogram of body weight per day. Some studies show benefits up to 2.4 grams per kilogram, though the gains above 2.2 tend to be marginal for most people. Going higher isn't harmful, it just doesn't necessarily produce a proportionally bigger result.

Total daily intake matters more than exact timing, but getting a good dose of protein (at least 20 to 40 grams) within a couple hours after a training session is a sensible habit. It doesn't have to be an immediate post-workout shake, but you don't want to train hard and then go six hours without eating either.

Maintenance means you're happy with where you are and just want to stay there. You're not aggressively cutting or bulking, just eating to support your health, energy, and body composition over the long term.

For maintenance, 1.2 to 1.6 grams per kilogram is a reasonable target for most active adults. It's enough to preserve muscle mass, support recovery from exercise, and keep you feeling satisfied without the effort required to hit a very high protein goal every day.

Think of this range as the sustainable, stress-free zone. You're not tracking obsessively, but you're still prioritizing protein at each meal, choosing high-quality sources, and making sure it doesn't fall off the radar entirely.

For women, daily protein needs depend heavily on activity level and goals, just like anyone else. A sedentary woman needs far less than a female powerlifter of the same weight, and a woman in a calorie deficit trying to preserve muscle needs more than one who's eating at maintenance.

As a general guide, most active women do well targeting 1.2 to 1.8 grams of protein per kilogram of body weight per day. For a 130-pound (59 kg) woman who exercises regularly, that translates to roughly 70 to 105 grams per day. For a 160-pound (73 kg) woman training seriously, it's closer to 88 to 130 grams.

Women sometimes under-eat protein out of concern that high protein intake will lead to excessive muscle bulk. It won't. Getting adequate protein supports a lean, toned physique; it doesn't automatically make you look bulky. That outcome requires years of heavy progressive training and often specific hormonal conditions that most women simply don't have.

Men generally need more total grams of protein per day simply because they tend to weigh more and carry more muscle mass on average. The per-kilogram targets are the same, but the absolute numbers end up higher.

An active man weighing 185 pounds (84 kg) targeting 1.6 to 2.0 grams per kilogram is looking at roughly 134 to 168 grams of protein per day. That's a meaningful amount that requires some planning, especially for men who don't naturally gravitate toward high-protein foods.

Men focused on building muscle or maintaining a lean physique as they age should pay particular attention to hitting their targets consistently. Muscle mass naturally declines with age starting in your 30s, and adequate protein intake is one of the most effective dietary habits for slowing that process. Lifting weights helps too, but the two really work best together.