Unit Converter · Baro

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A converter that already knows about 평, 돈, 근 and 관. It opens on the pair you used last with the number you typed still in it, both numbers are live — change one and the other follows on every keystroke — and there is no equals key to press. The metric, imperial, temperature and shoe-size pairs are one tap away in a curated list. Fully offline. No account, no ads, no subscription.

Why this one

Korean legacy units are not in the built-in converters, and it is not an oversight: they do not fit a plain linear-factor engine.

1 평 = 400/121 ㎡ and 1 자 = 10/33 m have no exact decimal form. This app keeps every factor as an exact fraction, so 84 → ㎡ → 평 comes back as 84, not 83.99999999999999.
근 is ambiguous — 600 g for meat, 375 g for vegetables, fruit and herbal medicine. Choosing silently makes the answer 60 % wrong, so the toggle is on screen whenever it matters and the engine has no default at all.
Shoe sizes are a lookup table, not a ratio. Out-of-range values say so instead of inventing a number.

Features

척관법 first: 평 ↔ ㎡, 돈 ↔ g, 냥 ↔ g, 근 ↔ g, 관 ↔ kg, 자 ↔ cm, 치 ↔ cm, 되 ↔ L, 말 ↔ L, 홉 ↔ mL
Both rows editable, live-linked — no equals key, no convert button
A five-slot chip rail of the pairs you actually use, in the order you put them
평형 read-out for apartment areas, with an 전용 / 공급 basis toggle
A curated catalogue — area, weight, length, temperature, volume, shoes, speed — with a live preview of your current number on every row, before you pick
Its own 64 dp keypad, painted with the first frame; the system keyboard never appears
Every conversion factor printed in plain text inside the app, so you can check it
Requests no system permissions at all — no camera, microphone, location or contacts
Works in airplane mode — verifiably zero network

Not in this app

Left out	Why
Currency / exchange rates	Live rates need a network call. This app makes none, ever — so currency is permanently out of scope rather than temporarily missing.
An exhaustive unit list	The catalogue is curated, not complete. Fewer, better pairs beat a menu you have to search.
Cooking cups and tablespoons	They depend on the ingredient's density. Pretending otherwise would give confidently wrong answers.
마지기	Regionally variable by a wide margin; there is no single honest factor.

Support

Questions, feedback, or a unit you want added? Email lionandthelab@gmail.com. Every message is read.