o PCOS

PCOS TDEE Calculator

Polycystic Ovary Syndrome (PCOS) lowers resting metabolic rate by 5–7%, most likely through insulin resistance. The PCOS TDEE calculator above applies a 6% BMR reduction by default so your daily calorie target matches what your body actually burns.

Polycystic Ovary Syndrome (PCOS) is associated with a reduced basal metabolic rate. Published studies place the reduction at 5–7% versus matched controls. This PCOS TDEE calculator applies a 6% BMR reduction when "PCOS" is selected as the life stage. The leading mechanism is insulin resistance, which reduces metabolic efficiency. See Jakubowicz et al., Clin Sci (Lond) 2013;125(9):423-432 (PMID 23688334).

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Your daily target

· cal/day

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  • BMR · cal/day at rest
  • BMI ·  
  • Lean body mass · kg

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Macros at maintenance

30% protein · 40% carbs · 30% fat

Advanced metrics

Numbers are estimates. Eat at your target for 2 to 3 weeks, track weight, and adjust by ±100 cal/day if it does not match your real maintenance. See how accurate is TDEE?

Show advanced metrics 12 metrics · 7 formulas · 2D macro selector · life-stage

All metrics

Calculate above to populate the full metric table.

All 7 BMR formulas (side-by-side)

Mifflin–St Jeor · Harris–Benedict (revised) · Katch–McArdle · Cunningham · Average · Simple multiplier · Custom

TDEE across activity levels

See how much your TDEE changes between sedentary and athlete. Highlighted bar is your current selection.

Macros: 2D selector

Goal × carb-split matrix: Cut / Maintain / Bulk × Low / Moderate / High carb.

Life-stage adjustments

Luteal phase · Pregnancy (T1/T2/T3) · Breastfeeding · Perimenopause · PCOS

Direct answer

PCOS reduces resting metabolic rate by 5–7% via insulin resistance. If you have a formal diagnosis, your standard TDEE is overstated. This calculator applies a 6% BMR reduction so your daily target reflects what your body actually burns.

If you have a formal PCOS diagnosis (Rotterdam criteria: irregular cycles, elevated androgens, polycystic ovaries on ultrasound, any 2 of 3), an unadjusted TDEE overstates your real maintenance by 5–7%. This PCOS TDEE calculator corrects for that automatically.

Why PCOS lowers TDEE

Most evidence points to insulin resistance as the primary driver:

  • Insulin resistance reduces the efficiency of glucose uptake into muscle.
  • Glucose preferentially routes to fat storage rather than to oxidation.
  • Net effect: lower thermic output for the same caloric intake.

This is the dominant explanation for why women with PCOS report difficulty losing weight on calorie targets that "should" work for their size.

What helps

  • Resistance training: improves insulin sensitivity, partially offsets the BMR reduction.
  • Higher protein intake (1.6–2.2 g/kg): supports lean mass and raises thermic effect of food.
  • Lower-glycemic carbohydrate sources: reduces insulin spikes. Many women with PCOS do well at moderate carbohydrate (30–40% of intake).
  • Inositol supplementation: myo-inositol and D-chiro-inositol (typical 40:1 ratio) improve insulin sensitivity (Unfer et al., Endocr Connect 2017).
  • Metformin (prescription only): established medical treatment for PCOS-related insulin resistance. Discuss with your provider.
  • Sleep and stress: short sleep and chronic stress both worsen insulin resistance independent of diet.

What to do next

  1. Run the calculator with "PCOS" selected. The 6% adjustment is applied automatically.
  2. For fat loss, subtract another 250–500 kcal using the calorie deficit calculator. A 300 kcal deficit is usually more sustainable than a 500 kcal deficit on a PCOS-reduced baseline.
  3. Set protein at 1.6–2.2 g/kg body weight per day. Protein blunts insulin response and supports lean mass.
  4. Distribute carbohydrate toward earlier meals. Jakubowicz et al. (2013) showed front-loading calories at breakfast reduced insulin resistance and testosterone in lean PCOS women.
  5. Add 2 or 3 resistance-training sessions per week. This is the lever with the largest effect on insulin sensitivity outside of medication.
  6. Recalibrate every 4 weeks using a 7-day weight moving average. Individual variation is large.

Sources

  • Jakubowicz D, Barnea M, Wainstein J, Froy O. Effects of caloric intake timing on insulin resistance and hyperandrogenism in lean women with polycystic ovary syndrome. Clin Sci (Lond). 2013;125(9):423-432. PMID 23688334.
  • Unfer V, Facchinetti F, Orru B, et al. Myo-inositol effects in women with PCOS: a meta-analysis of randomized controlled trials. Endocr Connect. 2017;6(8):647-658.
  • Multiple meta-analyses on PCOS-associated metabolic dysfunction. Individual variation is significant; use a 3-week empirical calibration window.

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Frequently asked questions

Should I apply this adjustment if I am not formally diagnosed?
No. Get a diagnosis first. PCOS is diagnosed by the Rotterdam criteria (any 2 of: irregular cycles, elevated androgens, polycystic ovaries on ultrasound). If you suspect PCOS, see a healthcare provider rather than self-adjusting. Irregular cycles can also reflect thyroid disease, hyperprolactinemia, or hypothalamic amenorrhea, which need different treatments.
Does PCOS make weight loss impossible?
No. PCOS makes it harder, not impossible. A lower TDEE target (the 6% adjustment above), higher protein, resistance training, and insulin-sensitizing strategies (inositol, metformin when prescribed) together produce comparable rates of fat loss to non-PCOS populations in clinical trials.
Why a 6% reduction specifically?
It is the median of the 5–7% range reported across PCOS metabolic studies. Individual variation is significant: some women see closer to 10% reduction, others closer to 0%. Use 6% as a starting point, then calibrate empirically with a 3-week weight trend.
Do I need to cut carbs to manage PCOS?
Not necessarily. Total carbohydrate matters less than carbohydrate quality and meal timing. Many women with PCOS do well on moderate-carb diets (30–40% of intake) built around lower-glycemic sources (legumes, intact grains, vegetables, dairy). Strict keto can help some women but is not required by the evidence base.
Will metformin or GLP-1 medications change my TDEE target?
Indirectly. Metformin and GLP-1 receptor agonists (semaglutide, tirzepatide) lower appetite and improve insulin sensitivity rather than raising TDEE directly. They make hitting your calculated PCOS TDEE deficit easier, not larger. Keep the 6% adjustment regardless of medication, and adjust the deficit based on real 3-week weight trend.