This online calculator converts square meters (m²) to square inches (in²) using exact legal definitions. The square meter is the SI unit of area (BIPM SI Brochure). The inch is defined exactly via the international yard (1 in = 25.4 mm), which fixes the square-inch factor.
Square Meters (m²) to Square Inches (in²) Converter
Enter a value in square meters (m²) below and press the button to convert it to square inches (in²).
Square Meters (m²)
Result in Square Inches (in²)
How to Use
- Enter an area in square meters (m²) in the input field.
- Choose Decimal Places (0–10) to control rounding.
- Press Convert to display the result in square inches (in²) with a calculation trace.
- Copy Result copies the output value to the clipboard.
- Clear All resets inputs, result, and the calculation trace.
- Swap — opens the companion square inches to square meters calculator.
Definitions of Measurement Units
Square meter (m²) — SI derived unit of area equal to the area of a square with sides of 1 meter. System: SI. Abbreviation: m². Cross-system reference useful here: 1 m² = 1550.0031000062 in² (exact, derived from the inch definition below).
Square inch (in²) — Area of a square with sides of 1 inch. System: Imperial/US customary. Abbreviation: in². With 1 inch defined as exactly 25.4 millimeters, 1 in² = (0.0254 m)² = 0.00064516 m² (exact).
Conversion formula
From square meters to square inches:
in² = m² × 1550.0031000062.
From square inches to square meters:
m² = in² × 0.00064516.
The factor is exact because 1 inch = 25.4 mm is fixed in law.
Sources: UK Units of Measurement Regulations 1995 — Schedule (inch = 25.4 mm); SI unit definition for the square meter: BIPM — SI Brochure.
Conversion table
| Square Meters (m²) | Square Inches (in²) |
|---|---|
| 0.0001 | 0.155000 |
| 0.0005 | 0.775002 |
| 0.0010 | 1.550003 |
| 0.0050 | 7.750016 |
| 0.0100 | 15.500031 |
| 0.0500 | 77.500155 |
| 0.1000 | 155.000310 |
| 0.2500 | 387.500775 |
| 0.5000 | 775.001550 |
| 0.7500 | 1162.502325 |
| 1.0000 | 1550.003100 |
| 2.0000 | 3100.006200 |
| 5.0000 | 7750.015500 |
| 10.0000 | 15500.031000 |
| 20.0000 | 31000.062000 |
| 50.0000 | 77500.155000 |
| 75.0000 | 116250.232500 |
| 100.0000 | 155000.310001 |
| 250.0000 | 387500.775002 |
| 1000.0000 | 1550003.100006 |
Real-World Examples
- A4 sheet (210 mm × 297 mm): 0.062370 m² = 96.673693 in².
- US Letter sheet (8.5 in × 11 in): 0.06032246 m² = 93.500000 in².
- Bank card ID-1 (85.60 mm × 53.98 mm): 0.004620688 m² = 7.162081 in².
- Compact disc, 120 mm diameter: 0.011309734 m² = 17.530122 in².
- Postcard (4 in × 6 in): 0.015483840 m² = 24.000000 in².
- Sticky note (3 in × 3 in): 0.005806440 m² = 9.000000 in².
- US business card (3.5 in × 2 in): 0.004516120 m² = 7.000000 in².
- One square foot: 0.092903040 m² = 144.000000 in².
- A3 sheet (297 mm × 420 mm): 0.124740 m² = 193.347387 in².
- A5 sheet (148 mm × 210 mm): 0.031080 m² = 48.174096 in².
What tasks bring this calculator into play? Suggestions for additional area tools or specific unit pairs are welcome in the comments; frequently requested ideas are prioritized.
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