How to use the US-Japan unit converter

What is this tool?

This tool converts US units to Japanese units and back. Just enter a number and it converts in both directions. No registration is required, and it is free.

What it converts

Currency: US dollars ⇔ Japanese yen (rate fetched automatically, shown with its date and time)
Temperature: Fahrenheit ⇔ Celsius
Distance, weight (lb ⇔ kg, oz ⇔ g), length (in ⇔ cm), volume (gal ⇔ L)
Gasoline: distance (miles ⇔ km), fuel amount (gal ⇔ L), fuel economy (mpg ⇔ km/L), price ($/gal ⇔ ¥/L)

How to use it

Choose a conversion section.
Enter a number.
Read the converted result. You can convert in either direction.

Common uses in US life

Meat sold by the pound, road distances in miles, weather in Fahrenheit, and gasoline priced per gallon are all everyday examples.

About the exchange rate

The server fetches the exchange rate automatically and caches it for 6 hours. Check the date and time shown. If fetching fails, a saved rate is used. You can also override the rate manually.

Why does the US use miles and gallons?

The US used British imperial units before independence, and they stayed in daily life afterwards.

The 1975 Metric Conversion Act encouraged conversion, but it was voluntary, not mandatory. The US Metric Board was then abolished in 1982, and momentum stalled.

Changing road signs, machines, blueprints, and textbooks would cost a huge amount of money and effort. That is why the old units remain in daily life, although science, medicine, the military, and car manufacturing use metric units.

Note that the US gallon (about 3.785 litres) differs from the imperial gallon (about 4.546 litres). This tool uses the US gallon.

Use the converter

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