Free Online Converters

Conversion charts

Quick-reference pages for the conversions people look up most — each shows the exact formula, a chart of common values, and a converter preset to that pair.

About these tools

The Convert section covers the conversions that come up constantly in daily life and work: measurement units (length, weight, volume, area, temperature, speed), world currencies, time zones, calendar dates, digital file sizes, and kitchen measurements.

Every converter runs instantly in your browser — no page reloads, no accounts, and your numbers never leave your device. The unit and cooking converters use exact standard definitions; the currency converter uses regularly updated reference rates and tells you exactly how fresh they are; and the timezone tools use the same IANA timezone database your operating system relies on, so daylight saving time is handled correctly.

Where it matters, each tool shows its work: conversion tables so you can see every unit at once, both directions of an exchange rate, and calendar-accurate date math that handles leap years properly.

The Unit Converter is the general-purpose starting point and covers length, weight, volume, area, temperature, and speed in both directions. Reach past it when the context adds something: the Cooking Converter knows that a cup of flour and a cup of honey weigh very different amounts, so it converts by ingredient density rather than volume alone. The Currency Converter needs a live rate and shows you its date; the Timezone Converter applies real daylight-saving rules from the IANA database rather than fixed offsets. For dates, the Date Calculator adds and subtracts across calendars and business days, while the Time Duration Calculator answers the narrower question of hours between two clock times. The conversion chart pages listed in the footer are the quick-reference version, each preset to one pair.

Frequently asked questions