Unit Converter & Calculator

One input box does it all: type 100cm to get a conversion table for every length unit, or 1200*1.1 to calculate instantly. Japanese traditional units like tsubo and shaku are built in — no menus to dig through.

✨ Features

  • Smart input auto-detects: number + unit converts, math expression calculates
  • Japanese traditional units built in — tsubo, tatami, shaku, momme and more
  • Conversion tables show every unit at once, with one-tap copy per row
  • Accepts full-width digits and ×÷ as-is. Runs entirely in your browser

🪄 Perfect for

Real estate & floor plans

Instantly convert tsubo and tatami counts to square meters when reading Japanese property listings.

Cooking & recipes

Turn ounces, pounds and cups from overseas recipes into grams and milliliters in a snap.

Shopping & travel

Quickly make sense of inches, feet, miles and Fahrenheit when shopping or traveling abroad.

Quick math

Discounts, tax, splitting a bill — do everyday arithmetic in the same box without opening a calculator app.

🔒 Privacy

All conversions and calculations run entirely in your browser. The numbers and expressions you enter are never sent to any server.

❓ FAQ

What standards are used for tatami and tsubo?

One tatami (jo) is 1.62 m² (Chukyo-ma standard) and one tsubo is 400/121 m² (about 3.3058 m²). Actual tatami sizes vary slightly by region.

Are data units decimal (1000) or binary (1024)?

Binary. 1 KB = 1024 B and 1 MB = 1024 KB in this tool.

How much math does the calculator support?

Basic arithmetic (+ - × ÷), parentheses, decimals, and a trailing % (50% = 0.5). Scientific functions such as sin are not included.

Is my input sent anywhere?

No. Every conversion and calculation happens inside your browser — nothing you type is sent to a server.
Try:

Type a number with a unit (e.g. 100cm, 70°F) to see a conversion table, or a math expression (e.g. 1200*1.1) to calculate.

Convert by category