A purchase price of $400 plus an $80 annual supplies budget gives $640 over three years, before electricity and other omitted costs. Use the calculator above to replace those illustrative values with your own prices and documented replacement intervals. This is a budget worksheet, not a forecast of product life, repairs or money saved.

Choose the question before adding costs

This worksheet answers how much the selected purchase and running-cost assumptions add up to. It does not decide whether a robot replaces a cleaning service, value your time, or establish which model cleans better. Keep the same currency, planning period and included categories when comparing two saved budgets.

Use an annual supplies amount when you already have a budget or a replacement log. Choose itemized parts when you want to see what filters, brushes, bags, pads or another applicable supply contribute. Enter only costs relevant to the exact robot and station package. A bagless station avoids a bag entry; that alone does not establish zero maintenance cost.

The self-cleaning robot vacuum page covers bagged versus bagless docks and the upkeep tasks automation leaves behind. Neither a dock label nor an advertised emptying interval supplies a verified annual cost.

How the calculator works

For an itemized recurring supply:

Annual allocation = price of one replacement set × 12 ÷ months between replacement sets.

For the selected period:

Budget = purchase price + annual recurring allocation × years + entered one-time costs due within those years.

Electricity, when selected, adds:

Annual electricity cost = entered annual whole-system kWh × your price per kWh.

The annualized parts calculation spreads an expense over time. It does not round up to whole retail packs, schedule checkout dates, subtract the accessories included in a box, or track leftover stock. Divide a multi-pack price by the number of usable replacement sets before entering its allocated cost. If you need a cash-payment calendar, keep a separate inventory and purchase record.

The calculator accepts whole planning years. A one-time entry in year 2 is included at the end of year 2 and remains counted once in later cumulative totals. An entry in year 4 stays outside a three-year budget. Year-one cost includes the initial purchase, one year’s recurring allocation and any entered year-one costs.

Illustrative input Annual or period contribution
Purchase, $400 once $400
Filter replacement set, $10 every 3 months $40 per year
Brush replacement set, $20 every 6 months $40 per year
Three years of those selected supplies $240
Selected three-year budget $640
Optional quoted $90 service in year 2 $90 once, making $730

Every price and interval in this table is hypothetical arithmetic. It is not a current offer, a maintenance recommendation, a failure rate or a parts-compatibility claim. No product was tested for this guide.

Replacement schedules are model-specific

Cleaning a filter and replacing a filter are different events. The iRobot care-frequency chart separates care from replacement and shows a two-month filter replacement entry for the listed older Roomba families. The eufy RoboVac accessory-care page gives a six-month or 50-cleaning-round filter entry and says frequency depends on usage. Those documents cover their stated product families; neither sets an interval for every current robot or station.

Use the exact manual, matching part number and applicable condition or usage limit for your configuration. If an instruction is based on cleaning rounds, record your expected rounds and the resulting calendar assumption yourself. A months-only entry cannot enforce a separate round limit. Do not use an unrelated model’s interval or the worksheet’s sensitivity view to override maintenance instructions.

The sensitivity view changes each entered recurring interval to 75% or 125% solely to show its effect on the annual allocation. It is not permission to delay replacement. Prices and usage can change; record the price date and source in your export.

Keep electricity and repairs separate

The Australian Government’s running-cost explanation uses annual kWh multiplied by the reader’s electricity rate. The same unit arithmetic applies here; this page does not import its example tariff, appliance assumptions or lifespan.

Use a representative annual figure for the whole robot-and-station system, including charging, washing or drying when present, and standby. A nameplate maximum, charging rating or dust-emptying peak is not a measured annual consumption figure. The calculator does not infer one from a manufacturer wattage. If you lack a useful figure, leave electricity explicitly outside the selected-cost budget.

Add a repair, battery purchase or other service expense only as an actual quote or a deliberate scenario. Enter it in the one-time section rather than recurring supplies. The worksheet does not predict whether the work will be necessary, safe, available or covered by a warranty. Follow the manufacturer’s service instructions and use qualified service where required.

Read the omissions with the result

A blank selected price or interval stays unknown. An explicit zero is a deliberate arithmetic entry. Unselected electricity and one-time costs are labeled as omitted, rather than measured as zero. Entering a source note records your assumption; it does not make the worksheet independently verify a price or schedule.

The displayed amount is the budget for the costs you selected. It excludes water, labor, inflation, financing, resale, unlisted parts and any taxes or shipping absent from your entered prices. All years use the same recurring allocation and prices. There is no reliability score, automatic battery replacement, predicted savings or claim that the robot will last for your chosen period.

Save CSV or print if you want to compare a second scenario. Entries otherwise stay in the current tab without automatic saving or server calculation. Changing the currency label reinterprets the same numbers; it does not perform currency conversion.

Connect the budget to the actual room

A smaller budget does not resolve physical access. Use the furniture clearance checker for the robot’s complete operating height and entry width. The existing budget robot shortlist addresses buying choices separately from this calculation.

Before adding a wet-cleaning routine to that budget, use the floor-care compatibility finder to compare actual floor, machine and cleaner instructions.

Sources and method

Source scope and formulas were reviewed October 16, 2026. This original worksheet reconciles cost categories and exact reader inputs; no price scrape, physical product test or reliability sample was used.