How many calories do you
actually burn each day?
Total daily energy expenditure — your real calorie burn — is the number every PCOS calorie target starts from. Here's how to find yours accurately.
| Goal | Daily calories | Expected rate | |
|---|---|---|---|
| Maintain weight | — | ±0 lb/week | Maintenance |
| Mild loss | — | ~½ lb/week | −250 cal |
| Moderate loss ★ | — | ~1 lb/week | −500 cal |
| Faster loss | — | ~1½ lb/week | −750 cal |
★ Moderate loss (−500 cal/day) is the most commonly recommended starting deficit for PCOS weight loss.
What is TDEE and why does it matter for PCOS?
Your total daily energy expenditure (TDEE) is the number of calories your body burns in a day — at rest, through digestion, and through movement. It's the starting point for every evidence-based calorie target. Eat below it to lose weight, at it to maintain, above it to gain.
For PCOS specifically, TDEE matters because insulin resistance — which affects a significant proportion of people with PCOS — can reduce the effectiveness of standard calorie deficits. The same 500-calorie deficit that produces reliable weight loss for most people may produce slower results for someone with PCOS-related metabolic changes. Understanding your TDEE gives you an accurate baseline to work from, and helps explain why results might be slower than expected even when calories are tracked accurately.
Why overestimating activity is the most common mistake
The activity multiplier is the single most variable input in this calculation. The difference between "sedentary" (×1.2) and "moderately active" (×1.55) on a 1,600 calorie BMR is over 500 calories per day — roughly the equivalent of an entire meal. Most people who exercise 3 times per week but have a desk job overestimate their activity level by one full category. When in doubt, go lower — you can always adjust upward based on your actual results.
Why does PCOS affect calorie burn?
Insulin resistance, elevated androgens, and thyroid involvement (which is more common with PCOS) can all affect resting metabolic rate. This calculator uses the standard Mifflin-St Jeor formula, which doesn't adjust for these PCOS-specific factors — meaning your real TDEE may be somewhat lower than the calculated number. This is why many dietitians recommend starting with a conservative activity estimate for PCOS patients.
How is TDEE different from BMR?
BMR (basal metabolic rate) is how many calories your body burns at complete rest — just to keep organs functioning, body temperature regulated, and cells alive. TDEE adds the additional calories burned through daily movement, exercise, and digestion. Your TDEE is always higher than your BMR; the activity multiplier determines by how much.
Should I eat at my TDEE or below it?
If your goal is weight loss, eat below your TDEE — typically 250–500 calories below, depending on how aggressive you want the deficit. If your goal is maintaining current weight, eat at TDEE. Use the goal table in the results section to find the calorie target for your specific objective, then use the PCOS macro calculator to convert that calorie number into daily gram targets for protein, carbs, and fat.
How accurate is this calculation?
Mifflin-St Jeor is the most validated BMR equation for women and tends to be more accurate than the older Harris-Benedict formula. That said, any formula-based TDEE estimate carries an error margin of roughly ±10–15% depending on individual factors including body composition, metabolic health, and stress levels — all of which can be affected by PCOS. Use the result as a starting point and adjust based on 2–4 weeks of actual results.
This calculator provides educational estimates only. It is not medical advice and is not a substitute for guidance from a registered dietitian, physician, or endocrinologist. If you have PCOS or another health condition, consult a healthcare provider before making significant changes to your diet.