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Solar system scale calculator

Scale a planet's diameter and mean distance from the Sun to your chosen model Earth size.

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Answer

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Scale a planet's diameter and mean distance from the Sun to your chosen model Earth size.

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Precision and calculation record
Rounding changes displayed numbers, not the calculation. Text, fractions, matrices and CSV schedules keep their own formatting. Automatic keeps up to 12 significant digits, with money shown to cents where applicable.
Saved scenario
Save the current answer, then change an input to compare. This clears when you leave.
Formula and assumptions
NASA fact-sheet equatorial diameters and mean Sun distances, updated March 2025. Distance is a mean orbital scale, not a live planet position or distance from Earth. Diameters exclude rings. The diameter and distance use the same scale; this shows why tabletop planet sizes require much larger orbital distances.
Automatic precision shows numbers to 12 significant digits. Thousands separators such as 1,000 are accepted; use a dot for decimals.
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Using Solar system scale calculator
Scale a planet's diameter and mean distance from the Sun to your chosen model Earth size.
NASA fact-sheet equatorial diameters and mean Sun distances, updated March 2025. Distance is a mean orbital scale, not a live planet position or distance from Earth. Diameters exclude rings. The diameter and distance use the same scale; this shows why tabletop planet sizes require much larger orbital distances.
Next: Scientific notation calculator
Next: Length converter
A worked example
If Earth is a 10 mm ball, Jupiter is about 112 mm across and sits about 610 m from the model Sun.
Before you use the result
NASA fact-sheet equatorial diameters and mean Sun distances, updated March 2025. Distance is a mean orbital scale, not a live planet position or distance from Earth. Diameters exclude rings. The diameter and distance use the same scale; this shows why tabletop planet sizes require much larger orbital distances.
Example results for model earth diameter (millimetres)
These examples use Planet: Jupiter. They are reference calculations, not recommended settings.
Model Earth diameter (millimetres)Model planet diameter (millimetres)
556.045782
10112.091565
20224.18313
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ToolOctopus. “Solar system scale calculator.” Updated 2026-09-29. https://tooloctopus.com/solar-system.
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