Nutrition and hydration
Estimate daily calories, macros, recipe scaling, and water intake.
FitArbor
Health and fitness calculators built for privacy — nothing leaves your browser.
All tools run entirely in your browser — we don't store your data.What you can do with FitArbor
FitArbor provides private, browser-based health and fitness calculators for hydration, sleep, running, nutrition, body metrics, and family planning estimates. The site is designed for quick self-checks without accounts or stored health profiles.
Body metrics
Compare BMI, body-fat estimates, ideal-weight ranges, and pet-age references.
Timing and training
Plan sleep cycles, running pace, due dates, and ovulation windows.
Common workflows
Estimate maintenance calories, macro targets, hydration, and running pace from one place.
Use sleep, water, and body-metric tools to set simple baselines you can revisit.
Scale servings and convert ingredients before shopping or meal prep.
How we keep the site useful
Health outputs are educational estimates. They are not medical advice, and the pages avoid storing personal health data.
All FitArbor tools
Open a tool below to use it immediately. Each page has its own inputs, result area, and help text where needed.
BMI Calculator
Get your BMI instantly with metric and imperial support, category on a visual scale, and healthy weight range.
TDEE Calculator
Get your BMR, maintenance calories, and cut/bulk targets using Mifflin-St Jeor and other leading formulas.
Macro Calculator
Free macro calculator for any diet goal — keto, IIFYM, high-protein, vegan — with grams per day and per meal.
Pregnancy Due Date Calculator
Calculate your due date from last period, conception date, or IVF transfer with trimester milestones.
Ovulation Calculator
Calculate your fertile window and ovulation day — see peak ovulation days for the next 3 cycles.
Water Intake Calculator
Calculate your daily hydration goal by weight, activity level, and climate in litres or oz.
Sleep Calculator
Find the ideal bedtime or wake-up time based on 90-minute sleep cycles with a nap calculator.
Body Fat Calculator
Calculate body fat percentage using the U.S. Navy circumference method and BMI estimate by age and sex.
Ideal Weight Calculator
See ideal weight from four medical formulas side-by-side — honest ranges, not targets.
Running Pace Calculator
Solve pace, time, or distance — race finish predictor, per-mile/km split tables, and unit conversion.
Dog & Cat Age Calculator
Calculate your pet's age in human years using real veterinary science, not the outdated 7× myth.
Recipe Scaler
Scale any recipe up or down by servings with density-aware cups-to-grams conversion for 30+ ingredients.