rai to sq-km | Exact Decimal + Formula

1 Rai (Thailand) = 0.0016 Square Kilometer

One square kilometer equals exactly 625 rais — a fixed ratio you can memorize. Real-world use: thai land measurement; four ngan make one rai. This page expresses those values in square kilometers, which is used for country, city, and national-park sizes; lake surface areas; and geographic statistics. Enter any value above — the result updates instantly, and a 1–1000 reference table follows below.

About Rai (Thailand) and Square Kilometer

Rai (Thailand) (rai)

A rai is a Thai area unit equal to 1,600 square meters (0.395 acre).

Where it's used: Thai land measurement; four ngan make one rai.

Square Kilometer (km²)

A square kilometer is the area of a square with 1-kilometer sides, 1,000,000 square meters.

Where it's used: Country, city, and national-park sizes; lake surface areas; and geographic statistics.

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Precision

Formula

km² = rai × 0.0016

To convert Rai (Thailand) to Square Kilometer, use the formula displayed above.

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Rai (Thailand) to Square Kilometer: Quick Reference Table

Rai (Thailand)	Square Kilometer (Decimal)	Fraction	Real-world equivalent
0.001 rai	0.000002 km²	-	fractional unit measurement
0.01 rai	0.000016 km²	-	fractional unit measurement
0.1 rai	0.00016 km²	-	fractional unit measurement
0.5 rai	0.0008 km²	-	fractional unit measurement
1 rai	0.0016 km²	-	fractional unit measurement
2 rai	0.0032 km²	-	fractional unit measurement
5 rai	0.008 km²	1/64 km²	fractional unit measurement
10 rai	0.016 km²	1/64 km²	fractional unit measurement
25 rai	0.04 km²	3/64 km²	fractional unit measurement
50 rai	0.08 km²	5/64 km²	fractional unit measurement
100 rai	0.16 km²	5/32 km²	fractional unit measurement
250 rai	0.4 km²	13/32 km²	fractional unit measurement
500 rai	0.8 km²	51/64 km²	fractional unit measurement
1000 rai	1.6 km²	1 19/32 km²	standard single unit scale

rai to km² Formula and Examples

Direct Formula km² = rai × 0.0016

Inverse Formula rai = km² × 625

Mental Math Shortcut

Divide the value by roughly 625 to quickly estimate the converted result.

Common Rai (Thailand) to Square Kilometer Calculations

5 rai = 0.008 km²
10 rai = 0.016 km²
50 rai = 0.08 km²
100 rai = 0.16 km²
500 rai = 0.8 km²

Precision & Practical Use

For example, 10 rai = 0.016 km² — roughly fractional unit measurement.

Real-estate and construction figures are usually rounded to the nearest square foot or square meter. Keep 2–3 significant figures unless you're doing engineering takeoffs.

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In home remodeling, flat wall and floor square footages are converted by paint coverage calculators (estimating paint gallons needed) or tile calculators (estimating tile counts, accounting for grout lines and a 10% waste factor). For roofing jobs, surface area is measured in roofing 'squares' (1 square = 100 sq ft). Landscapers use area calculators to estimate bulk mulch and topsoil volume in cubic yards. These specialized calculators bridge the gap between flat dimensional area and commercial material purchasing.

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How to Convert Rai (Thailand) to Square Kilometer

How many square kilometers are in one rai (thailand)?

One Rai (Thailand) (rai) equals 0.0016 Square Kilometer (km²). To convert rai (thailand)s to square kilometers, multiply the rai (thailand) value by 0.0016.

How do I convert Rai (Thailand) to Square Kilometer?

Multiply your rai (thailand) value by 0.0016 to get the result in Square Kilometer: km² = rai × 0.0016. For example, 5 rai = 0.008 km².

What is the formula for converting rai to km²?

The conversion formula is km² = rai × 0.0016. Use the calculator above for any value, and see the reference table below for common inputs from 0.001 to 1000.

Is there a quick mental estimate for rai to km²?