Area Reference Sheet

Metric (SI)

• 1 square millimeter (mm²) = 0.01 square centimeter (cm²)
• 1 square centimeter (cm²) = 100 square millimeters (mm²)
• 1 square meter (m²) = 10,000 square centimeters (cm²)
• 1 square meter (m²) = 1,000,000 square millimeters (mm²)
• 1 square kilometer (km²) = 1,000,000 square meters (m²)
• 1 hectare (ha) = 10,000 m²

U.S. / Imperial

• 1 square inch (in²) = 1/144 square foot (ft²)
• 1 square foot (ft²) = 144 square inches (in²)
• 1 square yard (yd²) = 9 square feet (ft²)
• 1 acre = 43,560 square feet (ft²) = 4,840 square yards (yd²)
• 1 square mile (mi²) = 640 acres

U.S. to Metric

• 1 square inch (in²) ≈ 6.4516 square centimeters (cm²)
• 1 square foot (ft²) ≈ 0.092903 square meters (m²)
• 1 square yard (yd²) ≈ 0.836127 square meters (m²)
• 1 acre ≈ 4,046.8564 square meters (m²)
• 1 acre ≈ 0.404686 hectares (ha)
• 1 square mile (mi²) ≈ 2.58999 square kilometers (km²)

Metric to U.S.

• 1 square centimeter (cm²) ≈ 0.1550 square inches (in²)
• 1 square meter (m²) ≈ 10.7639 square feet (ft²)
• 1 square meter (m²) ≈ 1.19599 square yards (yd²)
• 1 hectare (ha) ≈ 2.47105 acres
• 1 square kilometer (km²) ≈ 0.386102 square miles (mi²)

Quick benchmarks

• A4 sheet (210×297 mm) ≈ 0.06237 m²
• US Letter (8.5×11 in) ≈ 0.06097 m²
• Tennis court ≈ 260 m²
• 1 hectare (ha) = 100 m × 100 m square

Metric units (in m²)