How much protein per day to lose weight for a woman

While losing weight, aim for 1.8 to 2.4 g of protein per kg of body weight, the same rule as for men. A table by weight from 120 to 250 lb, a sample day with 134 g, and when to use your goal weight instead.

Oct 6, 2026 · By Calcelate Team

When you eat less to lose weight, the body takes energy from fat, but also from muscle. Protein is the part of the diet that protects the muscle. That is why the protein target goes up during a diet, even though the calories go down.

The rule: 1.8 to 2.4 g per kg

While losing fat, aim for 1.8 to 2.4 g of protein per kg of body weight a day (0.82 to 1.09 g per lb). The rule is the same for women and men. Women usually weigh less, so they need fewer grams in total, but not less per kg.

A woman who weighs 150 lb (68 kg) needs 122 to 163 g a day while losing weight. At 130 lb (59 kg) it is 106 to 142 g. The minimum for health is much lower, 54 g and 47 g, but the minimum is for staying healthy at a stable weight, not for keeping muscle in a deficit.

Why more protein helps during a diet

A review in the American Journal of Clinical Nutrition found that in controlled studies, higher-protein weight-loss diets led to more fat loss and better preservation of lean mass than lower-protein ones. Protein also makes meals a little more filling. The same review notes that long-term results are mixed, and that sticking to the diet matters most.

In lean people who lift weights, the need is higher still. A systematic review by Helms and colleagues estimated 2.3 to 3.1 g per kg of lean mass, higher the leaner the person and the bigger the deficit. The International Society of Sports Nutrition also supports higher intakes in a calorie deficit.

What 134 g looks like in a day

Four meals, nothing unusual, and the total is close to the middle of the range for a 150 lb woman. At 4 kcal per gram, 134 g of protein is about 536 kcal, a third of a 1,600 kcal diet. The rest of the calories come from carbohydrates and fat. The calorie deficit calculator shows how many calories you need for your goal.

To check your own meals, add them up in the protein in food calculator.

When to use goal weight

The per-kg rule assumes that most of your weight is lean tissue. With a lot of body fat, it overshoots. If your BMI is over 30, base the target on your goal weight instead.

Example: a woman who is 5 ft 4 in (163 cm) and weighs 220 lb (100 kg) would get 180 to 239 g from her current weight. That is more than she can use and hard to eat on a diet. Based on a goal weight of 160 lb (73 kg), the target is 131 to 174 g. The protein calculator has a goal weight field for this.

Special cases

• Pregnancy and breastfeeding. This is not the time for a strict diet. The protein RDA rises to 1.1 g/kg in the second half of pregnancy and 1.3 g/kg while breastfeeding. Talk to your doctor or midwife before cutting calories.
• Kidney disease. If your kidney function is reduced, follow your doctor’s protein limit, not this table.
• Over 65. Muscle is harder to rebuild in older age, so keeping it during a diet matters more. The PROT-AGE study group recommends at least 1.0 to 1.2 g/kg for everyone over 65, and more for those who are active.