Use your own measurements
Free off-grid toilet calculators and planners
Check which toilet categories fit your servicing arrangements, measure the installation, and compare capacity, ventilation and costs before you buy.
Get results in the browser, explore a change against a saved plan and share the current inputs when you want someone else to check them. Each page explains the method, assumptions and a worked example. No account or file download is needed.
Plan servicing and costs
Off-grid toilet running-cost calculator
What will the toilet cost to operate under your usage pattern?
Put your own prices against ventilation, liners and cover material to plan a year of use.
Toilet emptying-interval estimator
Can the liquid container reach the next servicing opportunity?
Estimate a liquid-container servicing range from your own daily volumes and a reserve allowance.
Cover-material consumption calculator
How much cover material should you buy beyond the stock you have?
Turn your measured dose per use into a bag quantity and seasonal stocking cost.
Off-grid toilet ownership-cost comparison
How do the toilet options compare over the years you will own them?
Compare upfront costs, annual running costs and scheduled replacements over the same ownership period.
Choose and fit a system
Campervan toilet space planner
Will the toilet fit and can you still remove the container?
Sketch a compartment with the toilet footprint, front container-removal space and an inward-opening door.
Off-grid toilet chooser
Which toilet categories deserve a closer look for your installation?
Compare toilet categories against your power, servicing and space arrangements using visible decision rules.
Toilet fan battery calculator
Does the fan’s allocated battery cover the period without charging?
Budget ventilation energy and rated battery capacity for a period without charging.
Off-grid toilet installation checklist builder
What must be resolved before fitting this toilet?
Create a printable preparation list for your toilet category, location and servicing access.
Calculations run locally in your browser. Sharing creates a URL containing your inputs, including any location coordinates; share only the details you want others to see.