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Life & Health

This category includes tools for gauging your body's condition — BMI, basal metabolic rate (BMR), estimated blood alcohol content (BAC) — alongside tools for reflecting on daily habits, like sleep cycle timing or a life-progress tracker. Since many of these involve personal body data, everything is calculated entirely in your browser.

Bmi Calculator

Client-side Bmi Calculator tool running 100% in browser.

Time Zone Converter

Client-side Time Zone Converter tool running 100% in browser.

Electricity Bill Calculator

Client-side Electricity Bill Calculator tool running 100% in browser.

Bmr Calculator

Client-side Bmr Calculator tool running 100% in browser.

Widmark Bac Calculator

Client-side Widmark Bac Calculator tool running 100% in browser.

Smoking Cost Life Calculator

Client-side Smoking Cost Life Calculator tool running 100% in browser.

Sleep Cycle Timer & Bedtime Calculator

Calculate optimal wake-up times and bedtimes based on 90-minute circadian sleep cycles to wake up refreshed without grogginess.

Body Fat Calculator (U.S. Navy Method)

Estimate your body fat percentage, fat mass, and lean body mass accurately using the U.S. Navy circumference method.

Caffeine Metabolism & Half-Life Calculator

Calculate caffeine decay, current bloodstream levels, half-life clearance, and optimal sleep-safe bedtime in real time.

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Life & Health Guide

From BMI to sleep cycles, everyday health-tracking tools

This category includes tools for gauging your body's condition — BMI, basal metabolic rate (BMR), estimated blood alcohol content (BAC) — alongside tools for reflecting on daily habits, like sleep cycle timing or a life-progress tracker. Since many of these involve personal body data, everything is calculated entirely in your browser.

These tools provide reference figures based on general formulas (WHO, KSSO standards, and similar), not a medical diagnosis. For an accurate assessment of your health, please consult a medical professional — treat these as a lightweight way to check in on yourself.

Frequently Asked Questions (FAQ)

Q.Can results here replace a medical diagnosis?

No. These are reference figures based on general formulas — please consult a medical professional for an accurate health assessment.

Q.Is body data like height and weight sent anywhere?

No. Since this is sensitive personal information, every calculation happens entirely in your browser and is never transmitted externally.

Q.Which BMI standard is used?

Both the WHO international standard and the KSSO Asia-Pacific standard are provided so you can compare.

Q.Can I use the BAC estimate to judge whether it's safe to drive?

No. It's an estimate based on the Widmark formula, and individual variation is significant — never drive after drinking, regardless of the estimate.