Solar System Model Scale Calculator
meters
This is the smallest classroom dimension either in length or width of your classroom ceiling or table that you will use to place the solar system model on.
1 AU = 0.247 Meters

1 Meter = 4.05 AU
Planet AU from
Sun
Meters from
classroom Sun
Mercury 0.39 0.096
Venus 0.72 0.178
Earth 1.00 0.247
Mars 1.52 0.375
Jupiter 5.20 1.284
Saturn 9.54 2.356
Uranus 19.18 4.737
Neptune 30.06 7.425
The source can be found on GitHub: https://github.com/kanglu/SolarSystemScale