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To help compare sizes of different surface areas, we list here areas of the order of 10²¹ square metres, i.e. those between 1 quadrillion km² and 10 quadrillion km². See also areas of other orders of magnitude.

• Areas smaller than 1 quadrillion km²
• 1 quadrillion km² is equal to:
  • 1 E21 m²
• 1.6 quadrillion km² — Ringworld (total area; fictional)
• Areas larger than 10 quadrillion km²

Orders of magnitude (area) SI unit: square metre Conversion of units#Area
1 fm²	1 pm²	1 nm²	1 µm²	1 mm²	1 m²	1 km²	1 Mm²	1 Gm²	1 Tm²
10 fm²	10 pm²	10 nm²	10 µm²	10 mm²	10 m²	10 km²	10 Mm²	10 Gm²	10 Tm²
100 fm²	100 pm²	100 nm²	100 µm²	100 mm²	100 m²	100 km²	100 Mm²	100 Gm²	100 Tm²
1,000 fm²	1,000 pm²	1,000 nm²	1,000 µm²	1,000 mm²	1,000 m²	1,000 km²	1,000 Mm²	1,000 Gm²	1,000 Tm²
10,000 fm²	10,000 pm²	10,000 nm²	10,000 µm²	10,000 mm²	10,000 m²	10,000 km²	10,000 Mm²	10,000 Gm²	10,000 Tm²
100,000 fm²	100,000 pm²	100,000 nm²	100,000 µm²	100,000 mm²	100,000 m²	100,000 km²	100,000 Mm²	100,000 Gm²	100,000 Tm²