Omikuji Tools Life & Calc

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?

Tatami comes in several sizes. The plain "Jo" is the 1.62 m² figure Japanese property listings must use as a minimum; Kyoma (about 1.824 m²), Chukyoma (1.656 m²), Edoma (1.549 m²) and Danchi (1.445 m²) are listed separately. One tsubo is 400/121 m² (about 3.3058 m²).

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.

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.

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