Metric, imperial and Thai land units
Thailand Unit Converter
Choose a category and convert between metric, imperial and common Thai land-area units.
Start calculatingYour figures
Calculate your estimate
Adjust any field. The result updates immediately and stays on this device unless you choose to share it.
Converted value
—Enter your figures to see the estimate.
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- Conversion category
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- Reference
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Estimates use the values entered and the methodology documented below. Check current provider or authority information before acting.
Method and limits
What this estimate means
Values are converted through a shared base unit. One rai is 1,600 m²; one ngan is 400 m²; one square wah is 4 m².
- Included
- Supported length, mass, temperature and Thai land-area units.
- Not included
- Survey accuracy, title-deed interpretation and rounding required by a specific legal document.
Before you decide
Use the result carefully
- 01
Use full precision for legal or survey work.
- 02
Check the unit printed on the source document.
- 03
Rai, ngan and square wah are area units, not lengths.
Primary references
Official and authoritative sources
Formula assumptions are reviewed against these sources. A linked source may be available primarily in Thai.
Questions
Common questions
How many square metres are in one rai?
One rai equals 1,600 square metres, four ngan or 400 square wah.
Can I convert temperature and weight?
Yes. Change the category and the available units update automatically.