Calculator: Earth Size

Earth diameter: 12,742 km Circumference: 40,075 km Surface area: 510.1 million km² Volume: 1.083 trillion km³ …compared to your custom size: [user input] Would you like a more technical, educational, or playful tone? I can adjust it for a kids' science site, a sci-fi worldbuilding tool, or a classroom resource.

Earth isn't the biggest planet, but it's our only home. Use the Earth Size Calculator to explore its true dimensions – from pole-to-pole diameter (12,742 km) to total surface area (510 million km²). Then scale it up or down relative to Jupiter, Mars, or a fictional world of your choosing. Perfect for students, space enthusiasts, or worldbuilders. earth size calculator

Not all planets are created equal. See how Earth measures up. Earth diameter: 12,742 km Circumference: 40,075 km Surface

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Diameter, circumference, surface area, volume – compare Earth to other planets, moons, or even custom-sized spheres. Instantly visualize scale like never before. Use the Earth Size Calculator to explore its

How big is your world?