The True 5-Year Cost of a Robot Lawn Mower (2026)

Short answer: for most suburban buyers the five-year cost is the sticker plus roughly $250 to $700 — and for a typical mower in our catalog the purchase price accounts for about 75–90% of the total. That is the reverse of a gas mower, where the machine is cheap and the running costs grind on. It means the single decision that determines your five-year cost is which mower you buy, not how you run it.

This guide takes the four recurring costs one at a time, shows what our own catalog says about each, and ends with worked five-year totals by tier. Everything here is computed from the same verified specs and street prices behind the MowScout Score, and where a number is genuinely unknown we say so rather than estimate it.

Where the money actually goes

Start with the shape of the problem, because it is counter-intuitive if you are coming from a gas mower.

A walk-behind gas mower costs a few hundred dollars and then asks for fuel, oil, plugs, blade sharpening and a carburettor clean, every year, forever. Its five-year cost is dominated by the years, not the purchase.

A robot mower inverts that. The machine is expensive and the years are cheap. There is no fuel, no oil, no winterising a carburettor, and the cutting system is three small razor blades rather than one heavy steel bar. What remains is small enough that for most owners it disappears into the noise of a household budget:

• Blades — roughly $10–$50 a year
• Electricity — roughly $15–$30 a year
• Battery — a one-off $100–$400, typically in years three to five
• 4G / cellular — $0 for most owners, because it is optional for mowing

Add those up across five years and a typical quarter-acre owner is looking at $250 to $450 on top of the sticker. A large, steep, multi-zone property running a flagship daily will land nearer $700. Neither figure moves the decision much when the machines themselves range from under $700 to over $5,000.

The sticker is 75–90% of it, so size the mower correctly

Because the recurring side is small, the purchase price is the five-year cost, near enough. And that is where our catalog data is unflattering to the obvious strategy of "buy the cheapest one".

Across the 37 models we track, cost per acre of rated capacity runs from about $900 to about $9,000 — a tenfold spread. The cheapest machines per acre are the large-capacity estate platforms; the most expensive per acre are small vision mowers whose sticker looks approachable until you divide by the lawn they actually cover.

That produces the single most expensive mistake in this category: buying a budget mower for a lawn it cannot finish. An under-sized machine does not fail dramatically. It runs longer and more often, finishes late in peak growth, and leaves you mowing the difference yourself — which is the outcome you spent the money to avoid. The five-year cost of that mower is its sticker plus the mower you buy to replace it.

The practical rule: measure your mowable turf, then compare only machines rated comfortably above it. Our yard-fit configurator screens every model we track against measured area, slope, tree cover and budget, which is a faster way to that shortlist than reading tier labels.

Blades: small, certain, and the one cost you cannot skip

Robot mowers cut with small pivoting razor blades rather than a single steel bar. They are cheap, they wear out, and replacing them is genuinely routine — a screwdriver and a few minutes.

Expect $10–$50 a year, depending on how much lawn you cut and how abrasive it is. Sandy soil, sticks and pine cones grind blades down faster than clean turf. Most owners on a quarter acre replace a set two or three times a season; a large estate machine cutting daily will get through more.

This is the one recurring cost with no way around it, and it is also the one most worth doing on schedule: dull blades tear grass rather than slicing it, which browns the tips and invites disease. Our blade replacement guide covers intervals and what a worn blade actually looks like.

Electricity: genuinely trivial

A robot mower's motors are small and it runs on a schedule rather than under load. For a typical quarter-acre lawn, expect roughly $15–$30 a year at US average electricity prices. A large machine on a bigger property running more cycles and carrying a larger battery climbs toward the top of that range and a little past it.

For scale: that is less than the fuel for a season of walk-behind mowing, and dramatically less than a single service visit. It is a real cost and it belongs in the arithmetic, but it is not a number that should change which mower you buy.

Battery: the cost that arrives late and surprises people

This is the item most often left out of a five-year comparison, and it is the largest recurring line when it lands.

Lithium packs degrade with cycles. On a robot mower that cuts several times a week through a long warm-season year, a pack typically becomes a question somewhere between years three and five — sooner on a machine running at the top of its rated area every day, later on one with comfortable headroom. Budget $100–$400 for a replacement, depending on pack size and brand.

Two things make this worse than it needs to be, and both are checkable before you buy:

• User-replaceable or not. Some brands sell a pack you can swap yourself; others treat the

battery as a service item. That difference is the gap between a $150 part and a shipping-plus- labour event.

• Warranty length. Across our catalog, 20 of the 37 models carry a 3-year warranty on the mower, fifteen carry two years, and two carry four. Battery packs often get a shorter term than the mower itself (Navimow and MOVA cover the pack for 2 years), so a pack that fails in year three is out of warranty on many of the machines we track.

If you intend to keep the mower a decade rather than five years, this is the line that decides whether that is realistic, and it is worth asking the brand directly before you buy.

4G and subscriptions: real, optional, and widely misunderstood

28 of the 37 models we track ship with 4G hardware. Some brands include the connection for a period and then charge; others include it indefinitely. That has produced a persistent worry that robot mowers are a subscription product.

They are not, in the way that matters. Every mower in our catalog will map, schedule and cut your lawn with no recurring fee. What a lapsed cellular plan costs you is:

• remote status and control when you are away from home Wi-Fi
• off-network theft alerts and location reporting
• some brands' cloud map backups

Whether that is worth an annual fee depends entirely on whether your dock is inside home Wi-Fi range and how exposed your lawn is. For a fenced back garden on a strong signal, many owners let it lapse and lose nothing they use. For an open front lawn on a rural property, the theft tracking alone is usually worth it — and our theft guide covers what GPS reporting does and does not achieve without a live cellular link.

The brand-by-brand detail sits in robot mower hidden costs, which tracks who charges what and for how long.

The accessories nobody prices in

Two more items, both small, both routinely forgotten:

A base station is not optional. Every model we track requires one, and every one ships with it — but where it goes is your problem. If the only sensible spot is exposed, a garage or cover runs roughly $100–$200 and meaningfully extends the life of the dock contacts. Our garage guide is honest about when it is worth it and when it is not.

An antenna, on 5 of 37 models (plus fallbacks). The five RTK machines that need a clear-sky reference antenna, and the network-RTK models that fall back to one outside coverage, add a placement constraint rather than a cost — but if your only clear-sky mount is a roof, that can mean a mast, a cable run, or a tradesman. Antenna-free machines avoid the problem entirely, which is a genuine ownership advantage that never appears on a spec sheet.

Worked five-year totals

Using our catalog's tier medians for the sticker (catalog prices verified in late August or September 2026) and the mid-point of each recurring range:

Two honest caveats on that table. First, the running column assumes you replace the battery once inside five years, which is likely but not certain — a lightly loaded machine may not need it. Second, it assumes no 4G subscription, because for most owners there is not one; add whatever your brand charges if you want the connection.

Against those totals, the comparison that actually matters for most people is a lawn service. At roughly $50 a visit across a 28-visit warm-season year, that is $1,400 a year, or $7,000 over five — so even an estate-class robot is cheaper than three seasons of service, and a mid-tier machine costs about what a single season does. The do robot mowers save money? walks that arithmetic per scenario.

Resale is a real recovery, and it is brand-shaped

Five-year cost assumes you keep the machine. If you sell it, the recovery is larger than most owners expect and very unevenly distributed.

Robot mowers hold value better than most outdoor power equipment for a simple reason: the parts that wear are cheap and replaceable, so a four-year-old machine with fresh blades and a healthy pack does the same job as a new one. What kills resale is the opposite of wear — it is obsolescence in the navigation stack. A boundary-wire machine competes against wire-free rivals that are easier to install; an RTK machine that needs an antenna competes against antenna-free ones. Capability that was premium three years ago becomes the thing buyers route around.

Two practical consequences. Buy the platform, not the discount — a heavily discounted outgoing model is cheap for the same reason it will be hard to sell. And keep the box and the base station: a complete unit with its dock and manuals sells materially better than a bare mower, because the dock is the part a private buyer cannot easily source.

Our resale value guide tracks what actually holds value across the catalog.

The cost nobody puts in the spreadsheet

The honest reason most people buy one of these is not money, and a five-year cost table can obscure that.

A quarter-acre lawn takes roughly 45 minutes to mow, once a week, for about 28 weeks of a warm-season year. That is 21 hours a year, or 105 hours across five years — most of a working fortnight, spent walking behind a machine in the heat. A robot mower does not eliminate lawn work; you will still trim edges, clear sticks before a run, and deal with the occasional stuck machine on a slope. But it converts a scheduled weekend obligation into a background process.

Whether 105 hours is worth $1,300 is a question about your life, not your lawn, and we are not going to answer it for you. What we will say is that the arithmetic in this guide is the floor of the value case, not the whole of it — and that anyone selling you a robot mower purely on money is being less than straight about where the benefit actually comes from.

What we do not know, and will not pretend to

We have not run these machines for five years, because they have not existed at this maturity for five years. The blade, electricity and subscription figures come from published specifications, manufacturer pricing and owner-reported intervals; the battery window is the softest number here and is stated as a range for that reason.

What we can say precisely is what the catalog says: the sticker spread, the cost-per-acre spread, the warranty distribution, and how many machines carry 4G hardware. Those are computed from verified data and recomputed when the data changes. Where this guide estimates, it says so — and our how we test page is explicit that MowScout is spec-verification, not hands-on testing, until that changes.

If you want the five-year number for a specific machine rather than a tier, the configurator will narrow to the models that genuinely fit your yard, and each model page carries its own verified price and warranty.