Enter your rig
Fresh water gallons, battery bank and any solar, propane on board, and grey and black tank sizes. If you use the RigSense iOS app, it reads these from your saved rig, so there's nothing to type in.
The one resource that ends your stay
A stay off-grid doesn't end when the average tank hits empty. It ends the moment one resource runs out. You might have four days of power and a week of propane, but if the fresh water gives out on day three, that's your trip. The Duration Estimator finds that resource — the binding constraint — and puts a number on it.
It reads your rig's actual capacities: fresh water, battery and power, propane, and the waste tanks. Then it estimates how many days each one lasts at your usage and reports the shortest. If fresh water is what gives out first, that's what you'll see, so you can fill up before you leave instead of cutting the trip short.
How the off-grid duration calculator works
Set your usage
How you actually camp: showers, cooking, heat, and power draw. The estimate follows your habits rather than a generic average.
Read the binding constraint
You get days remaining and the single resource that runs out first. The tool also respects legal stay limits, so a 14-day BLM cap shows up alongside your resource math when that's the shorter number.
Free, and it reads your rig
The Duration Estimator is a free web tool. Open it in a browser, enter your numbers, and get an answer. Nothing to install.
It also connects to the RigSense iOS app. Once your rig is set up in the app, the tool pulls those capacities automatically, so the estimate matches the rig you actually drive. Answer "how long can I boondock" once, then adjust it as you plan each trip.
On the App Store
Set up your rig once and the estimate follows you on every trip.
