Convert rais to square millimeters

1 rai=1,600,000,000mm²

Use the converter below to change any rais value into square millimeters instantly — with formula, conversion table, and real-world examples.

You have

Equals

1,600,000,000

Conversion formula

Forward

square millimeters = rais × 1,600,000,000

Reverse

rais = square millimeters × 6.2500e-10

Example: 10 rai × 1,600,000,000 = 16,000,000,000 mm².

About both units

From

Rai

rai

The rai equals 1600 square metres exactly — the traditional Thai land unit. It is 1/6.25 of a hectare. Still widely used in Thai property transactions and agricultural documents. A rai is subdivided into 4 "ngan" (400 m² each).

Real-world: A small Thai farm might be 10–20 rai (1.6–3.2 ha). Thai rice yields: 400–600 kg per rai.

Read full rai reference →

Square Millimeter

mm²

The square millimetre equals 1/1,000,000 of a square metre. Used in precision engineering, electronics (transistor size, chip area) and microscopy. The cross-section of an electrical cable is often specified in mm².

Real-world: Typical household wiring is 2.5 mm² copper. A grain of rice covers about 10 mm². A pin head is under 1 mm².

Read full square millimeter reference →

Rai to Square Millimeter conversion table

Common rais to square millimeters values for quick reference.

Rai (rai)	Square Millimeter (mm²)
1 rai	1,600,000,000 mm²
5 rai	8,000,000,000 mm²
10 rai	16,000,000,000 mm²
50 rai	80,000,000,000 mm²
100 rai	160,000,000,000 mm²
500 rai	800,000,000,000 mm²
1,000 rai	1,600,000,000,000 mm²
5,000 rai	8,000,000,000,000 mm²
10,000 rai	16,000,000,000,000 mm²
50,000 rai	80,000,000,000,000 mm²

Tips & common mistakes

Quick tips

1 rai = 1600 m² = 0.16 ha.
1 rai = 4 ngan = 400 tarang wa.
1 hectare = 6.25 rai.

Avoid these

Assuming rai equals hectare — only 16%.
Mixing rai with ngan or tarang wa without conversion.
Using rai outside Thailand — not internationally recognised.

Frequently asked questions

How many square millimeters in a rai?

One rai equals 1,600,000,000 square millimeters.

How do I convert rais to square millimeters?

Multiply the rai value by 1,600,000,000 to get the equivalent in square millimeters.

What is 100 rais in square millimeters?

100 rais equals 160,000,000,000 square millimeters.

Is a rai bigger than a square millimeter?

Yes. 1 rai equals 1,600,000,000 square millimeters, so one rai is larger.

How to convert rais to square millimeters without a calculator?

Multiply by 1,600,000,000 for a quick estimate; use a calculator for precise results.

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Convert rais to square millimeters

🧮 Conversion formula