Explain a number with things people know
“46 hectares” means nothing to a room; “ten Tokyo Domes” does. Type the number, get comparisons that fit a slide, a lesson or a news story.
- Runs entirely in your browser
- Works offline
- No upload
- No sign-up
- No watermark
Loading the tool…
How it works
- Type the amount and pick its unit — metric, imperial or Japanese (坪, 畳, 升, 貫…).
- Read the comparisons; hover any line to see what the reference is based on.
- Copy the sentence, or download a card image for slides.
Why nothing is uploaded
Every operation on this page is done by code running inside your browser tab, using the same engine that renders web pages. The file is read from disk into your tab’s memory, transformed there, and written back out as a download. It is never sent anywhere — not to us, not to a third party.
Verify it yourself
- Open your browser’s developer tools (F12) and select the Network tab.
- Load your file and run the tool.
- The only requests you will see fetch the tool’s own code — and, for a few heavy tools, their open-source engine from a public CDN — plus one small page-view ping to loreatec.jp (page address and title, nothing more). None of them carry your file.
Frequently asked questions
How are the comparisons chosen?
From a fixed table of about eighty references, each with a value and its basis (Tokyo Dome footprint 46,755 m² per the operator; a football pitch at FIFA’s recommended 105 × 68 m; a Shinkansen car at 25 m…). The tool prefers references that give a readable number — roughly between one and a hundred of something — and lists up to eight.
How accurate is “an elephant” or “a bathtub”?
It is a typical value, and the basis is shown on hover. Some references are exact (Tokyo Dome, Skytree, a marathon); others are typical (an adult, a car, a bathtub). The point is scale, not measurement — say “about” when you quote it.
Why the walking time?
Because distance is felt best as time: “the Moon is 384,400 km away” is abstract, “nine years of walking, non-stop” is not. Speeds used: 5 km/h walking, 285 km/h Shinkansen, the speed of light for the truly large.
Can I add my own references?
Not yet in this version. If a comparison is missing that would be widely useful, tell us — the table is meant to grow.