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TDEE for women: what's different and why

The same calculator works for women. Here is what changes in the formulas, and what to watch for.

Written by AdnanUpdated 7 min read

Women can use the standard TDEE calculator. The formulas already adjust for sex: in Mifflin-St Jeor, a woman's BMR is 166 calories a day lower than a man's of the same weight, height and age, mainly because women carry less lean mass on average. What does differ is the safety floor (about 1,200 calories a day), the effect of the menstrual cycle on the scale, and the life stages, such as pregnancy and breastfeeding, when a calculator should not be used.

How the formulas treat women

Women: BMR = 10 × weight (kg) + 6.25 × height (cm) − 5 × age − 161
Men: BMR = 10 × weight (kg) + 6.25 × height (cm) − 5 × age + 5

The only difference in Mifflin-St Jeor is the constant at the end: −161 for women and +5 for men. Sex works as a shortcut for body composition. If you know your body fat percentage, Katch-McArdle skips that shortcut and works from your lean mass instead, which can be more accurate for very muscular women.

Worked example

30-year-old woman, 65 kg, 165 cm, light activityBMR = 650 + 1,031.25 − 150 − 161 = 1,370 calories. × 1.375 = 1,884 maintenance. A 500-calorie deficit gives 1,384, and a 250-calorie deficit gives 1,634. A man with identical stats would have a maintenance of about 2,112.

The 1,200-calorie floor

About 1,200 calories a day is the commonly cited minimum for women dieting without medical supervision. Smaller and less active women can reach it quickly: a 155 cm, 50 kg sedentary woman has a maintenance of only about 1,329. If a standard deficit takes you below 1,200, use a smaller one and add daily movement instead. How big should your calorie deficit be? covers this in detail.

Your cycle and the scale

Water retention often rises in the days before a period and can add a kilogram or more on the scale. It isn't fat, and it passes. To avoid false alarms:

  • Compare weekly averages, not single weigh-ins.
  • Compare the same phase of your cycle month to month.
  • Track your waist measurement too. It is less affected by water swings.

Some research reports small rises in energy use and appetite in the second half of the cycle. The effect is modest and varies from person to person, so it is not worth changing your calorie target for.

Pregnancy, breastfeeding and menopause

  • Pregnancy: energy needs rise, especially later in pregnancy. Don't use a TDEE calculator to set a target, and don't diet without your doctor or midwife's advice.
  • Breastfeeding: producing milk uses extra energy. Dieting can affect supply, so get professional advice first.
  • Menopause: many women lose muscle and become less active around menopause, which lowers TDEE. Strength training and enough protein help. See how much protein you really need.

Getting an accurate number

  1. Choose your activity level honestly. This guide has examples.
  2. If you lift regularly, estimate your body fat with the body fat calculator. It uses your hip measurement as well as neck and waist. Then try Katch-McArdle.
  3. Test the result for 2–3 weeks, one full cycle if you can, and adjust.

Calculate your TDEE with the female equations.

Open the TDEE calculator

Frequently asked questions

Do women have a lower TDEE than men?
On average, yes, mainly because women tend to have less lean mass. In the Mifflin-St Jeor equation, a woman's BMR is 166 calories lower than a man's with the same weight, height and age. Katch-McArdle uses lean mass instead and gives the same result for anyone with the same weight and body fat.
Does my menstrual cycle change my TDEE?
Some studies report small increases in energy use and appetite in the second half of the cycle, but the effect is modest and varies between people. Water retention before a period can hide fat loss on the scale, so compare the same phase of your cycle from month to month.
Can I use a TDEE calculator while pregnant or breastfeeding?
No. Energy needs rise during pregnancy and breastfeeding, and dieting is not recommended without medical advice. Ask your doctor, midwife or a registered dietitian what you need.
What is the lowest calorie intake for women?
About 1,200 calories a day is the commonly cited minimum for women dieting without medical supervision. The calculator warns you if any target falls below it.
Does menopause lower TDEE?
Many women lose muscle and become less active around menopause, which lowers TDEE. Strength training, enough protein and regular recalculation help.

Keep reading

Body fat calculatorThe women's version uses hip size.How big a deficit?Safety floors explained.Track and adjustWeekly averages that ignore water swings.

Sources

  1. Mifflin MD, St Jeor ST, Hill LA, Scott BJ, Daugherty SA, Koh YO. A new predictive equation for resting energy expenditure in healthy individuals. Am J Clin Nutr. 1990;51(2):241–247. PubMed 2305711
  2. Frankenfield D, Roth-Yousey L, Compher C. Comparison of predictive equations for resting metabolic rate in healthy nonobese and obese adults: a systematic review. J Am Diet Assoc. 2005;105(5):775–789. PubMed 15883556
  3. Centers for Disease Control and Prevention. Losing Weight: gradual, steady weight loss of about 1 to 2 pounds per week. cdc.gov.