Built for PCOS.
Not adapted from generic tools.
Eight free calculators built specifically for the metabolic reality of PCOS — because insulin resistance, hormonal imbalance, and slower fat loss rates deserve their own math, not a standard formula with a PCOS label pasted on top.
Why CalcPCOS exists
Most nutrition calculators treat every user the same. You enter your height, weight, and activity level, and you get a calorie number and a 33/33/33 macro split. The calculation doesn't know whether you have insulin resistance. It doesn't account for slower metabolic rate. It doesn't adjust carbohydrate targets for PCOS. It doesn't tell you what your HOMA-IR score means for your diet, or how Metformin affects weight loss timelines, or what body fat percentage is associated with better hormonal outcomes for PCOS specifically.
We built CalcPCOS because those details matter — and because people with PCOS deserve tools that reflect their actual physiology, not an average that was never designed to include them.
"A calculator that doesn't account for insulin resistance isn't a PCOS calculator. It's a general calculator with a different heading. We built these tools to close that gap — one evidence-based formula at a time."
What's on CalcPCOS
Eight free calculators, each built from the ground up for PCOS — not adapted from general tools. No signup required, no ads, no paywalls.
How we approach accuracy
Every calculator on CalcPCOS is built from published clinical formulas, peer-reviewed research, and where relevant, guidance from professional bodies in endocrinology and nutrition. We document the methodology for each tool and are transparent about where estimates are approximations rather than exact values.
What our tools are built on
The formulas and reference ranges used across CalcPCOS come from the following sources and bodies of research:
Primary sources and references
- Mifflin-St Jeor BMR equation — Mifflin MD et al. (1990). A new predictive equation for resting energy expenditure in healthy individuals. Journal of the American Dietetic Association.
- HOMA-IR formula — Matthews DR et al. (1985). Homeostasis model assessment: insulin resistance and β-cell function from fasting plasma glucose and insulin concentrations in man. Diabetologia.
- US Navy body fat formula — Hodgdon JA and Beckett MB (1984). Prediction of percent body fat for US Navy men and women from body circumference and height. Naval Health Research Center.
- PCOS insulin resistance prevalence — Diamanti-Kandarakis E & Dunaif A (2012). Insulin resistance and the polycystic ovary syndrome revisited. Endocrine Reviews.
- Inositol and PCOS fertility — Unfer V et al. (2017). Effects of myo-inositol in women with PCOS. Gynecological Endocrinology.
- Metformin weight outcomes in PCOS — Tang T et al. (2012). Combined lifestyle modification and metformin in obese patients with polycystic ovary syndrome. Human Reproduction.
- PCOS dietary guidance — Teede HJ et al. (2018). Recommendations from the International Evidence-Based Guideline for the Assessment and Management of Polycystic Ovary Syndrome. Human Reproduction.
- Carbohydrate targets for insulin resistance — American Diabetes Association Standards of Medical Care (2024); Feinman RD et al. (2015). Dietary carbohydrate restriction as the first approach in diabetes management. Nutrition.
Medical disclaimer
This is the part we take seriously — and ask you to read.
CalcPCOS is an educational tool, not a medical service
All calculators on this site provide educational estimates based on published formulas and clinical research. They are not medical advice, not a diagnosis, and not a treatment plan. No calculator can account for your complete medical history, current medications, lab values, or individual physiology.
If you have PCOS, insulin resistance, fertility concerns, or any other health condition, please consult a qualified healthcare provider — including a physician, endocrinologist, registered dietitian, or reproductive specialist — before making significant changes to your diet, exercise programme, supplementation, or medications.
Specific tools carry additional notices: the Metformin & Weight Calculator is not a prescribing tool and Metformin is a prescription medication requiring medical supervision. The Fertility Calorie Calculator is not a fertility treatment plan. The Insulin Resistance Calculator is a screening tool, not a diagnostic instrument.
We built CalcPCOS to inform and support — not to replace the professional care that PCOS deserves.
Your data and privacy
CalcPCOS does not collect, store, or transmit any personal health information you enter into our calculators. All calculations happen locally in your browser. When you close the page, your data is gone. We do not require account creation, email addresses, or personal details of any kind to use any tool on this site.
We use standard anonymous analytics (page views, traffic sources) to understand which tools are most useful. No personally identifiable information is collected through analytics.
Get in touch
We genuinely want to hear from users — whether it's a calculation error you've spotted, a tool you'd like to see built, a piece of research we should incorporate, or feedback on how a calculator could be more useful for your situation.
We also review and respond to questions about how specific calculators work and what the results mean for individual situations, though we cannot provide personal medical advice.
Questions, corrections, or ideas?
We read every message and respond to questions about calculator methodology, data sources, and tool requests.
hello@calcpcos.com