Which tool do you need?
- Something shows a code: use the error code lookup. It covers fridges, thermostats, generators, water heaters, slide-outs and leveling systems.
- Something stopped working: the problem finder takes you from the part that is acting up to the right fix guide.
- The breaker keeps tripping: the 30 amp load calculator shows whether your AC, microwave and water heater can run at the same time.
- Planning a trip without hookups: the propane, battery and solar, generator and inverter calculators tell you how long your supplies last and what size of gear you need.
Where the numbers come from
Each calculator starts with figures from the makers’ own manuals and spec sheets, such as Dometic, Suburban, Norcold and Cummins Onan, and lists them under Sources on its page. Your own appliance can differ, so every number is a box you can change. Type in the figure from your unit’s label or manual and the result updates as you type.
The tools run in your browser. They need no sign-up and save nothing about you.
Common questions
Are these RV calculators free?
Yes. Every tool on this page is free to use, with no account and no limit on how often you use it.
How accurate are the results?
They are as accurate as the numbers you put in. The starting values come from maker specs for common RV appliances, but your models may draw more or less, so check the label on your own unit for the best answer.
Do the calculators work on a phone?
Yes. They work on phones, tablets and computers, and they keep working with a weak signal at the campground once the page has loaded.