Question 1

How do I convert time between time zones online?

Accepted Answer

Enter your time in the input field, select your source time zone, and choose your destination zone — the converted time updates automatically. For scheduling meetings across multiple cities, use the World Clock & Scheduler which shows hourly time slots in up to 4 cities and lets you add the meeting to Google Calendar, Office 365, or Outlook directly.

Question 2

How many kilometers are in a mile?

Accepted Answer

One mile equals exactly 1.609344 kilometers. To convert miles to kilometers, multiply the number of miles by 1.609344.

Question 3

How do I convert Celsius to Fahrenheit?

Accepted Answer

To convert Celsius to Fahrenheit, multiply the temperature by 9/5 and add 32. For example, 100°C × 9/5 + 32 = 212°F.

Question 4

How many pounds are in a kilogram?

Accepted Answer

One kilogram equals approximately 2.20462 pounds. To convert kilograms to pounds, multiply by 2.20462.

Question 5

How many centimeters are in an inch?

Accepted Answer

One inch equals exactly 2.54 centimeters. This is a fixed conversion factor: to convert inches to cm, multiply by 2.54; to convert cm to inches, divide by 2.54.

Question 6

How is BMI calculated?

Accepted Answer

BMI is calculated as weight in kilograms divided by height in metres squared (BMI = kg / m²). Categories: Underweight under 18.5, Normal 18.5–24.9, Overweight 25–29.9, Obese 30 and above.

Question 7

What is compound interest and how do I calculate it?

Accepted Answer

Compound interest grows by earning interest on previously earned interest. The formula is A = P × (1 + r/n)^(n×t), where P is the principal, r is the annual rate, n is the compounding frequency, and t is the time in years. Use the Rule of 72 (72 ÷ rate%) to estimate doubling time.

Question 8

Are exchange rates live and accurate?

Accepted Answer

Yes — currency rates come from the European Central Bank (ECB) via the Frankfurter API, updated daily. The historical chart shows 7, 30, or 90 days of rate movement for any supported currency pair.

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Free Resources

Ultimate Unit Conversion Cheat Sheet

Metric vs. Imperial — Complete Guide

Currency Conversion for Travelers

Kitchen Conversion Poster

BMI & Healthy Weight Reference Card

World Time Zone Map