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Length Converter
Converts between 15 length and distance units instantly, showing the exact conversion factor…
Rai to Square metre
Converts rai to square metre with the exact defined factor. One rai is 1600 square metre.
Converters
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Enter a value to convert.
In short
One rai is 1600 square metre, so to convert rai to square metre you multiply by 1600, and to go back you multiply square metre by 0.000625. 2 rai is 3200 square metre, 5 is 8000 and 10 is 16000. The Thai land units nest cleanly in metric: 1 rai is 1600 m2, 1 ngan is 400 m2, and 1 square wah is 4 m2 — so a rai is 4 ngan and a ngan is 100 square wah, with no rounding anywhere. A title deed reads as three numbers in that order, and a plot written "2-1-50" means 2 rai, 1 ngan and 50 square wah, which is 3,800 m2. The rai is used in Thailand, where land is sold in rai and title deeds are written in rai, ngan and square wah.
How to use the Rai to Square metre
- Type the value you want to convert.
- Pick the unit you are converting from and the unit you want.
- The converted value and the exact conversion factor are shown instantly.
About the Rai to Square metre
The Thai land units nest cleanly in metric: 1 rai is 1600 m2, 1 ngan is 400 m2, and 1 square wah is 4 m2 — so a rai is 4 ngan and a ngan is 100 square wah, with no rounding anywhere. A title deed reads as three numbers in that order, and a plot written "2-1-50" means 2 rai, 1 ngan and 50 square wah, which is 3,800 m2.
What people use it for
- Reading a listing or a document quoted in rai.
- Checking a figure someone else converted.
- Getting the exact factor to reuse in a spreadsheet.
Details
| 1 Rai | 1600 Square metre |
|---|---|
| 1 Square metre | 0.000625 Rai |
| Definition | 1 rai = 1600 m2 = 4 ngan = 400 square wah = 0.3954 acre. |
| Used in | Thailand, where land is sold in rai and title deeds are written in rai, ngan and square wah |
| Conversion type | Exact multiplication — both units are defined against the Square metre |
The maths behind it
This tool uses square metre = rai × 1600, an exact defined factor with no offset. Every intermediate value is shown on screen, so the result can be checked by hand.
1 rai = 1600 m2 = 4 ngan = 400 square wah = 0.3954 acre.
Frequently asked questions
How do I read a Thai title deed area like 2-1-50?
As rai, ngan and square wah in that order. Two rai is 3,200 m2, one ngan is 400, fifty square wah is 200 — 3,800 m2 in total. The three units are exact multiples of each other, so the arithmetic is always clean.
What is the exact factor?
One rai is 1600 square metre, and one square metre is 0.000625 rai. It is a defined value rather than a measurement, so it does not change and the conversion is exact in both directions.
Is the Rai to Square metre free, or is there a paid tier?
Free, unlimited, and no email address required. You can use it a hundred times a day and nothing changes.
Does anything I enter leave my computer?
No. The Rai to Square metre runs entirely in your browser using JavaScript. Your input never reaches inputtesthub.com or any third party — open your browser's Network tab while you use it and you will see no request go out.
How is the result calculated?
It uses square metre = rai × 1600, an exact defined factor with no offset. The full working is printed under the result, so you can follow every step rather than trusting a black box.
What do I get if I try it?
Enter 10 rai and the Rai to Square metre returns 16000 square metre.
What problem does the Rai to Square metre solve?
The jobs it is built for: reading a listing or a document quoted in rai. Checking a figure someone else converted. Getting the exact factor to reuse in a spreadsheet. It is built for exactly those cases rather than being a general-purpose tool with this bolted on.
What do people usually get wrong here?
1 rai = 1600 m2 = 4 ngan = 400 square wah = 0.3954 acre.
What are the key numbers for the Rai to Square metre?
1 Rai is 1600 Square metre. 1 Square metre is 0.000625 Rai. Definition is 1 rai = 1600 m2 = 4 ngan = 400 square wah = 0.3954 acre.. These are printed on the page itself, so you do not have to take them on trust.
How precise is the result?
The calculation runs in double precision and the result is shown to ten significant figures, so converting a value and converting it back returns the original. What is displayed is rounded for readability; what is copied is not.
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