What is square metre?
The square metre is the SI unit of area. It is widely used in real estate, construction, interior design, and land measurement across countries that use the metric system.
Real-world uses
Square metres are the global standard for floor space in real estate listings, construction blueprints, and land surveys outside the US. Solar panel output is rated per square metre, and rental prices in most countries are quoted per m².
History
The square metre is a derived SI unit that follows naturally from the metre. It became the standard area unit as the metric system spread globally. Real estate markets worldwide adopted it as metrication displaced local units like the tsubo (Japan) and pyeong (Korea).
Common mistakes
Confusing linear metres with square metres—a room that is 3 m × 4 m is 12 m², not 7 m. Also, forgetting that when scaling dimensions by a factor, area scales by the square of that factor.
What is square inch?
A square inch is a unit of area in imperial and US customary systems equal to 1/144 of a square foot. It is used for measuring small surfaces, printed circuit boards, and product specifications in imperial-based industries.
Real-world uses
Square inches are used for pressure measurements (psi = pounds per square inch), display pixel density (pixels per square inch), and small-area calculations for labels, stamps, and PCB layouts in the US. Cooking pan sizes are sometimes described in square inches.
History
The square inch derives from the inch, which was standardized internationally in 1959 as exactly 25.4 mm. It has long been used in American and British engineering for specifying small areas, cross-sections, and pressure measurements.
Common mistakes
Confusing square inches with cubic inches (a volume unit used for engine displacement). Also, forgetting that 1 ft² = 144 in² (12 × 12), not 12 in².
When is this conversion used?
Converting between square metre and square inch is common when working across metric and imperial systems, such as international trade, travel between countries with different measurement standards, or following instructions from a different region.
Worked examples
1 square metre = 1,550.00310001 square inch
1 square inch = 0.00064516 square metre
How to convert square metre to square inch
To convert square metre to square inch, multiply the value by 1,550.00310001.
To convert square inch back to square metre, multiply by 0.00064516.
Measurement standards
The square metre is the SI derived unit of area. The hectare (10,000 m²) is accepted for use with the SI by the BIPM, particularly for land measurement, though it is not an SI unit itself.
Did you know?
Vatican City, the world's smallest independent state, covers just 0.44 km² (about 109 acres) — smaller than many golf courses. By contrast, Russia spans over 17.1 million km², nearly 39 million times larger.
Quick reference: square metre to square inch
| square metre | square inch |
|---|---|
| 0.1 | 155.00031 |
| 0.5 | 775.00155 |
| 1 | 1,550.00310001 |
| 2 | 3,100.00620001 |
| 5 | 7,750.01550003 |
| 10 | 15,500.03100006 |
| 25 | 38,750.07750015 |
| 50 | 77,500.15500031 |
| 100 | 155,000.31000062 |
| 250 | 387,500.77500155 |
| 500 | 775,001.5500031 |
| 1,000 | 1,550,003.1000062 |
Common values
| square metre | square inch | |
|---|---|---|
| A4 paper | 0.062 square metre | 96.1001922 square inch |
| Parking space | 12.5 square metre | 19,375.03875008 square inch |
| Tennis court | 260.87 square metre | 404,349.30869862 square inch |
| Football field (soccer) | 7,140 square metre | 11,067,022.13404427 square inch |
| Central Park, NYC | 3,410,000 square metre | 5.285511e+09 square inch |
Available Area units
More square metre conversions
- Convert square metre to square kilometre
- Convert square metre to square foot
- Convert square metre to square mile
- Convert square metre to acre
- Convert square metre to hectare
- Convert square metre to square centimetre
- Convert square metre to square inch
- Convert square metre to square yard
- Convert square metre to are