The amount on the product page is only the first line. A required service, replacement accessory or specialist charger can change the ownership picture long after the box is opened.
This calculator does not supply prices. Enter current figures from the seller and service terms, then keep the result with the date and sources you used.
The calculator needs JavaScript. You can use the same three-part method in our ownership-cost guide.
What to put in each box
Robot and required kit is the one-off amount needed for the experience you actually want. Include a required dock, controller or starter kit rather than treating it as an optional extra.
Subscription each month is the repeating amount needed for the features you plan to use. Enter zero if the useful core works without one. Check our subscription guide if the product page is unclear about what stops.
Accessories each year is a planning allowance for items you reasonably expect to replace or add. Do not invent a number to make the total look complete; zero is more honest when the need is unknown.
Costs the calculator leaves out
Electricity, repairs, changing service terms and resale value are excluded because a generic estimate would create false precision. Note those uncertainties beside the result instead.
For a broader view of time, setup and support—not only money—use the complete buying checklist.