Off-grid tools & calculators
Practical calculators that do the math for you, so you can plan with real numbers instead of guesses. Free to use, no signup.
Free off-grid calculators
Solar sizing calculator
Size the panels, battery, inverter, and controller for what you want to run.
Open the tool →Battery bank & runtime
How long your batteries last on a given load, and the usable capacity you really have.
Open the tool →Wire gauge & fuse
The copper wire size and fuse a DC run needs to be safe and hold voltage drop down.
Open the tool →Water storage & usage
How much water your household uses and how big a storage buffer to hold.
Open the tool →Firewood / heating
The heat a space needs, a wood-stove size, and cords of firewood per winter.
Open the tool →Off-grid cost estimator
A realistic budget range for the systems you need, plus the ongoing yearly cost.
Open the tool →Rainwater harvesting
How much rain you can catch from your roof, given your local rainfall.
Open the tool →Chicken flock & coop
Coop and run size, nesting boxes, feed, water, and eggs for your flock.
Open the tool →Generator sizing & fuel
The generator size your loads need, and the gas, propane, or diesel it burns per day.
Open the tool →Propane usage & tank size
Gallons per month for your propane appliances, the right tank, and refills per year.
Open the tool →Heat loss & insulation
What your building really loses, in BTU, cords, propane gallons, and kWh, and what tightening it up saves.
Open the tool →Solar panel tilt angle
The right tilt for your panels by latitude, year-round or adjusted by season.
Open the tool →Wind turbine estimator
What a small wind turbine would honestly produce at your average wind speed.
Open the tool →Micro-hydro potential
Head and flow to watts: what your stream could generate around the clock.
Open the tool →Well pump sizing
The flow, head, pump size, and pressure tank your well setup needs.
Open the tool →Septic & greywater sizing
Tank size and drainfield footprint for your household and soil, before you call the engineer.
Open the tool →Driveway gravel & cost
Yards, tons, truckloads, and dollars for a gravel drive or access road.
Open the tool →Fencing materials & cost
Posts, wire, gates, and a real materials budget for the fence around your acreage.
Open the tool →Garden size & self-sufficiency
How much garden it takes to feed your household at the level you're aiming for.
Open the tool →Food storage planner
The staples, cans, and buckets a real months-long pantry takes, and the shelf space to hold it.
Open the tool →One useful off-grid email a week.
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