Free Gut Health Tools
Free Calculators for a Healthier Gut
Instant, science-based tools built on Dr. George Springer's 45+ years of clinical practice. No sign-up, no email, no catch — just answers. Start with the Hydration Score; more tools are on the way.
Choose a Calculator
Quick Tools, Real Insight
Each tool gives you an instant, personalized result — then points you to exactly the right next step in your gut health journey.
Hydration Score
Find your daily water target and where you stand today — hydration is the #1 overlooked driver of constipation.
Open calculatorDaily Fiber Intake
Your personalized fiber target and how far the average diet falls short of feeding a healthy gut.
In developmentMagnesium Needs
Estimate your daily magnesium target — the mineral your colon needs to contract and move waste.
In developmentBMI & Healthy Weight
Your BMI and the healthy weight range for your height, with what the number does and doesn't mean.
In developmentGut Health Score
A 60-second self-assessment using the Bristol Stool Scale and key symptoms to score your digestion.
In developmentHydration
Daily Water Intake Calculator
Your colon is a water recycler. When you're under-hydrated, it pulls every drop of moisture from waste — leaving stools hard and slow. This free tool, built on Dr. Springer's 45+ years of clinical practice, shows your daily target and where you stand today.
What's Your Hydration Score?
Dehydration is one of the most common — and most overlooked — drivers of digestive trouble. Answer four quick questions to see your personal daily water target and where you stand today.
Enter your body weight and water intake to see your Hydration Score.
Educational estimate only — not medical advice. Individual needs vary with climate, medication, and health conditions. See the clinical references at the bottom of this page.
The Research Behind This Tool
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Derivation and Internal Validation of a Score to Predict Dehydration Severity (National Library of Medicine, PMC)
Percent Dehydration = 100% × [(Stable Weight − Admission Weight) ÷ Stable Weight] — the clinical gold-standard measure of hydration status.
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The Water Intake Calculator — daily fluid-requirement methodology
Basis for the personalized daily water target in the Hydration Score tool above.
Choose Your Path Forward
Hydration is just one root cause. Here's how to take the next step toward solving yours — in exactly the right place for you.