Here is a table if you wanted to make a scale version of the solar system. It’s based on making the Earth a 1in sphere and then gives how far from the Sun each planet should be and how big of a ball to use for each planet.
This is from frink a programming language based on accurate representation of units. If you are into really nerding-out take a look at the unit data which describes lots of possible unit conversions.
|Name||Distance from Sun||Diameter|
|Sun||9 feet, 1.3 in|
|Mercury||378 feet, 8.8 in||0.383 in|
|Venus||707 feet, 7.6 in||0.95 in|
|Earth||978 feet, 4.5 in||1.0 in|
|Mars||1490 feet, 8.8 in||0.533 in|
|Jupiter||5090 feet, 3.7 in||11.221 in|
|Saturn||1 miles, 4068 feet||9.46 in|
|Uranus||3 miles, 2936 feet||4.012 in|
|Neptune||5 miles, 3011 feet||3.887 in|
|Pluto||7 miles, 1715 feet||0.178 in|
Scaled speed of light: 1.337 mph