01
Length Converter
Converts between 15 length and distance units instantly, showing the exact conversion factor…
Rai to Acre
Converts rai to acre with the exact defined factor. One rai is 0.395369 acre.
Converters
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Free, unlimited
Enter a value to convert.
In short
One rai is 0.395369 acre, so to convert rai to acre you multiply by 0.395369, and to go back you multiply acre by 2.52929. 2 rai is 0.790737 acre, 5 is 1.97684 and 10 is 3.95369. 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 Acre
- 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 Acre
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 | 0.395369 Acre |
|---|---|
| 1 Acre | 2.52929 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 acre = rai × 0.395369, 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 0.395369 acre, and one acre is 2.52929 rai. It is a defined value rather than a measurement, so it does not change and the conversion is exact in both directions.
Does the Rai to Acre cost anything?
No charge and no sign-up. There is no free tier to run out of because there is no paid tier — inputtesthub.com is funded by advertising rather than by metering the tool.
Is my data uploaded anywhere?
No. The Rai to Acre runs entirely in your browser using JavaScript. Because the work happens locally, the tool also keeps working if your connection drops, and closing the tab is all it takes to discard everything.
Can I check the maths myself?
It uses acre = rai × 0.395369, 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.
Can you show an example?
Enter 10 rai and the Rai to Acre returns 3.95369 acre.
When would I actually need the Rai to Acre?
In practice it gets used for three things: 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.
Is there anything to watch out for?
1 rai = 1600 m2 = 4 ngan = 400 square wah = 0.3954 acre.
Which values should I know?
1 Rai is 0.395369 Acre. 1 Acre is 2.52929 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.
Is the number rounded?
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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