FREE ONLINE TOOLS
Health Tools
Health and fitness calculators for non-diagnostic estimates, training, hydration, sleep, wellness planning, and habit checks. This support category is noindex and kept out of the sitemap while stronger public workflow hubs carry discovery.
PUBLIC HEALTH INDEX
15 Health tools
BMI Calculator Health
Calculate BMI with visual gauge, color-coded results, age/gender context, and BMI reference chart.
Open toolBody Fat Calculator Health
Estimate body fat percentage with US Navy method or BMI formula. Visual gauge, category chart, metric and imperial units.
Open toolBreathing Exercise Health
Guided breathing timer with 4-7-8 and box breathing patterns.
Open toolCalorie Calculator Health
Calculate daily calorie needs using the Mifflin-St Jeor equation. Get BMR, TDEE, macro breakdown with protein/carbs/fat, SVG pie chart, and goal-based targets for weight loss or gain. Supports metric and imperial units.
Open toolCalorie Deficit Calculator Health
Calculate the exact calorie deficit needed to hit your weight loss goal — enter your stats, choose your activity level, and get a personalized daily calorie target with a timeline.
Open toolHeart Rate Zone Calculator Health
Calculate your heart rate training zones based on age and resting heart rate.
Open toolIdeal Weight Calculator Health
5 medical formulas (Hamwi, Devine, Robinson, Miller, BMI), visual comparison chart, body frame adjustment, BMI scale.
Open toolMacro Calculator Health
Calculate macros with TDEE, BMR, 6 split presets, custom sliders, per-meal breakdown, and weekly projection.
Open toolOvulation Calculator Health
Calculate your ovulation window and fertile days based on your cycle length.
Open toolPace Calculator Health
Calculate running pace, finish time, splits table, and race predictions for 5K to marathon with km and mile support.
Open toolReaction Time Test Health
Measure your reaction time in milliseconds — wait for the green signal, click as fast as possible, and see your average across 5 rounds with a performance rating.
Open toolSleep Calculator Health
Calculate optimal bedtimes and wake times based on 90-minute sleep cycles. Two modes: set wake time or bedtime. SVG sleep cycle timeline showing light, deep, and REM phases. Includes 15-min fall-asleep adjustment, recommended hours by age group, and sleep quality tips.
Open toolTDEE Calculator Health
Calculate your Total Daily Energy Expenditure (TDEE) — enter age, weight, height, gender, and activity level to get daily calorie needs for maintenance, loss, and gain.
Open toolWaist-to-Hip Ratio Calculator Health
Calculate your waist-to-hip ratio and see your cardiovascular health risk level — supports cm and inches for both men and women.
Open toolWater Intake Calculator Health
Calculate recommended daily water intake based on weight, activity level, and climate. Interactive glass tracker with click-to-fill icons, progress bar, stat cards for target/consumed/remaining, and hydration tips. Supports metric and imperial.
Open toolQuality boundary
Use these tools for browser-first drafts, calculations, receipts, and exportable artifacts. For money, safety, legal, medical, regulated, or production-critical decisions, verify the output before acting.