Free: 15-question metabolic assessment — reviewed by the HealthCalculus medical panel. Start now

SureShotFat Loss

Free Assessment

All 27 auditsEvery popular diet, dismantled against the literature Head-to-head312 comparisons scored on one rubric The methodHow we grade evidence — and publish failures Research hub500+ peer-reviewed citations, searchable

Most read

The GLP-1 regain problem

What SURMOUNT and STEP actually show about stopping — and the off-ramp research nobody quotes.

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Coming off a GLP-1Ozempic, Wegovy, Mounjaro off-ramp HormonalPCOS, thyroid, menopause, postpartum Metabolic healthInsulin resistance, fatty liver, visceral fat Food firstWhat to eat — including Indian and vegetarian

Built for the diaspora

The South Asian blind spot

Risk starts at BMI 23, not 25. If your reports read “normal” while you feel anything but, start here.

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All calculators10 free tools — no signup, no email wall Metabolic assessment15 questions, 2 minutes, matched protocol Know your numbersHbA1c, insulin, lipids, thyroid explained Sourcing guidesWhat to buy, skip, and ignore

12-week programStructured, protocol-matched, fully cited Inner CircleOngoing membership and community Medical panelReviewed by HealthCalculus clinicians PricingEverything, plainly, before you pay

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Calculators that talk to you

No forms. The panel asks one thing at a time, reacts to what you say, and explains what your number actually means.

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Pick your number

Every result links to the research behind it.

Insulin Resistance Calculator

Estimate your insulin-resistance level from labs or proxy markers.

TDEE Calculator

Mifflin-St Jeor TDEE with a metabolic-adaptation correction for repeat dieters.

Protein Target Calculator

Daily protein target by goal — including post-GLP-1 muscle preservation.

UPF Score Calculator

Six questions about a normal day. We score how much of it is ultra-processed.

GLP-1 Transition Planner

12-week off-ramp protocol — protein, strength, sleep, and taper schedule.

Visceral Fat Estimator

Estimate visceral fat from waist-to-height ratio and proxies.

Metabolic Age Calculator

Estimated metabolic age vs chronological — directional, not diagnostic.

Seed Oil Spotter

Paste any ingredient list. We highlight the seed oils.

Fasting Window Calculator

Personalized fasting window — accounts for sex, cycle, training, stress.

Macro Calculator

Goal-based protein / fat / carb breakdown with sample meals.

Beyond the estimate

These are estimates. Your labs are facts.

Free calculators infer from proxies — waist, weight, habits. On a program you upload real bloodwork, a HealthCalculus panel doctor reads it, and the numbers stop being approximations.

See the programs Free assessment first

Free tools

Proxy estimates from waist, weight and habits

On program

HbA1c, fasting insulin, lipids, thyroid, vitamin D

Free tools

A number and an explanation

On program

A doctor's written interpretation, in plain language

Educational only, not medical advice. These calculators produce estimates, not diagnoses. Consult your physician before major dietary changes or altering prescribed medication. These statements have not been evaluated by the Food and Drug Administration. Individual results vary; no outcome is guaranteed.