Unit Converters

Metric to imperial, dollars to euros, epoch time to dates — conversions you need dozens of times a week, done in seconds. Convert currency, length, weight, temperature and area; shift times across US time zones and the rest of the world; flip between Unix timestamps and human dates; and convert files without uploading them anywhere: HEIC photos from your iPhone to JPG or PNG, PDF pages to PNG or JPG images, and short video clips to animated GIFs. Everything runs in your browser.

Conversion mistakes are usually unit mistakes

The arithmetic of conversion is easy; the traps are in the units. A US gallon is about 20% smaller than a British one, an ounce of weight is not a fluid ounce, and a tonne is not a ton. The Length Converter and Weight Converter show the common units side by side so you can see which system a number belongs to before you act on it.

The Currency Converter works with editable rates so you can match the rate your bank or card actually gives you, and the Time Zone Converter is built for the recurring meeting problem: pick two zones and a time, and see the business-hours overlap. The guides below cover the conversions people search for most.

Guides from the blog

• KG to LBS: Kilograms, Pounds, Stone and Ounces — The exact factors for six units, with the two-ton and two-ounce traps flagged.
• Celsius to Fahrenheit: Formulas and Shortcuts — The exact formula, anchor points like 37°C = 98.6°F, and when the shortcut is safe.
• USD to EUR Conversion: How Exchange Rates and Fees Really Work — Mid-market rates vs the rate you actually get, hidden markups, and how to check the real cost before you convert.
• Metric vs Imperial: History, Conversions & Who Uses What — Why the US still uses miles and pounds, and the conversions you actually need.