Unit Converter
Convert length, weight, area, volume, temperature and many more units. Traditional Japanese units such as tsubo, jo (tatami), shaku and kan are included too.
Image & print📄 Paper size chart
Your last category, units and value are remembered in this browser and restored next time.
In every unitClick to copy
Paper size chart
A and B series, postcards, business cards, envelopes, photos, US sizes
- 72 … The reference for Illustrator, InDesign and PDF. These treat 1 point as 1 pixel, so A4 is 595 × 842 px.
- 96 … The reference for Windows displays and CSS. Use this when thinking about actual size on web pages.
- 350 … The standard for images sent to a print shop in Japan (300 dpi is common elsewhere). Create photo and flyer artwork at this resolution.
What this tool can do
HANETanni is a free unit converter for length, weight, area, volume, temperature and more. No install and no sign-up required. All calculations run inside your browser, so the numbers you enter are never sent to or stored on a server.
-
📐13 categories
Length, weight, area, volume, temperature, speed, time, data size, pressure, energy, angle, fuel economy, and image & print (px, pt, Q and more).
-
🇯🇵Traditional Japanese units
Includes the traditional Japanese shakkanho units still in use today: tsubo, jo (tatami mat) and tan for area; shaku, sun and ken for length; kan, monme and kin for weight; go, sho and to for volume.
-
📋Every unit at once
Enter one value and a table shows it converted into every unit in the category — no need to keep switching units.
-
⚡Converts as you type
Results update with every keystroke. No button to press.
-
💾Remembers your last settings
Your last category, units and value are restored next time, so repeat conversions take no setup.
How to use it (3 steps)
-
Pick a categoryChoose a category such as "Length" or "Area" from the tabs at the top.
-
Enter a value and unitsEnter the number and its unit on the left, and pick the target unit on the right. Press "⇄" to swap them.
-
Use the resultThe result appears instantly. The table below lists the value in every unit of the category.
When it comes in handy
Understanding Japanese property sizes (tsubo, tatami mats)
Choose "Area" to see square meters, square feet, tsubo, jo (tatami mats) and more side by side.
In Japan, property listings use square meters, people talk about land in tsubo, and room sizes are given in jo — the number of tatami mats. One tsubo is about 3.306 m² (35.6 sq ft), and one tatami mat (Chukyo-ma size) is half of that. Seeing every unit at once makes it easy to compare listings, especially if you are renting or buying in Japan.
Converting between imperial and metric
Inches, feet, pounds, gallons, Fahrenheit and other US customary / imperial units are all supported.
Specs, recipes and documents often mix inches and pounds with metric. Enter a number and pick the category to get the other system instantly. Fahrenheit (℉) isn't a simple multiplication, so it is easy to get wrong — this tool converts it correctly.
Checking paper and print sizes
The "Paper size chart" below the converter lists A and B series, postcards, business cards, envelopes, photo prints and US Letter/Legal in millimeters, inches and pixels.
Pick a resolution to see the pixel size at that dpi: 96 dpi for web pages, 300–350 dpi for print. The chart is always available regardless of the selected category.
Checking file and disk sizes
"Data size" handles both MB/GB (powers of 1000) and MiB/GiB (powers of 1024).
This difference is why a hard drive's advertised capacity doesn't match what your computer shows. You can see both side by side.
We make no guarantee as to the accuracy or completeness of the explanations on this page or the results of this tool. Traditional Japanese units can vary by region and purpose (tatami mat size, for example). Always double-check calculations used for transactions or contracts. See our Terms of Use and Privacy Policy for details.