5 Free Calculators for Model Railroaders to Use and Share with Friends
The folk at ModelBuildings have made available 5 calculator tools. The service is free for the model railroading community, so you are welcome to use the tools and share the link with your friends by email, Facebook, Google+, Twitter etc.

www.modeltrainbeginners.com/tools

Just click on the useful tools tab at the top of the page after clicking through and click on free calculators-