Is a robot mower worth it?
It depends entirely on what it replaces, which is why the calculator prices all three ways to keep grass short from your own lawn rather than quoting a payback. Replacing a mowing service, a robot pays for itself in one to three seasons for almost any lawn — the service is $1,500 a year at a typical price and the robot's running cost is under $300. Replacing your own Saturday mowing, it pays back only if your time is worth something to you on paper; if you count the hour as free, a robot never pays back on a small flat lawn, and that is a fine reason to buy one anyway. The honest number is the one with your hourly rate in it.
A $1,200 robot on a 30-week season: 171 a year of depreciation over 7 years, 18.8 kWh of electricity ($2.81 — the number everyone quotes and the smallest one on the page), $80 of blades: $254 a season. Against a $55 weekly service ($1,650) that's paid back in 0.9 seasons. Against mowing 10,000 sq ft yourself at $30 an hour, 3.4; at $0 an hour, never.
Service vs robot, by lawn size
| Lawn | Service per visit | Service per season | Robot class | Robot per season | Payback |
|---|---|---|---|---|---|
| 5,000 sq ft | $42–63 | $1,575 | Small (to ¼ acre), ~$800 | $197 | 0.6 seasons |
| 10,000 sq ft | $42–63 | $1,575 | Small (to ¼ acre), ~$800 | $197 | 0.6 seasons |
| 20,000 sq ft | $50–71 | $1,815 | Medium (¼–½ acre), ~$1,400 | $283 | 0.9 seasons |
| 43,560 sq ft (1 acre) | $58–118 | $2,640 | Large (½–1 acre), ~$2,400 | $426 | 1.1 seasons |
Weekly service at the midpoint of LawnLove's 2026 price range for the size; robot at the midpoint of its class's typical price, 7-year life, 5 sessions a week at 0.125 kWh, 4 blade sets at $20, 30-week season, 15¢/kWh. The service still comes for edging and cleanup — see below.
Payback by robot price and service price
| Robot price | $40 / visit | $55 / visit | $70 / visit | $100 / visit |
|---|---|---|---|---|
| $800 | 0.8 | 0.6 | 0.4 | 0.3 |
| $1,200 | 1.3 | 0.9 | 0.7 | 0.4 |
| $1,800 | 2.1 | 1.4 | 1.0 | 0.7 |
| $2,500 | 3.3 | 2.1 | 1.5 | 1.0 |
Seasons to pay back, weekly service, 30 weeks. The longest case in the grid — the most expensive robot against the cheapest service — is 3.3 seasons, and only 3 of 16 cells pass two: against a service, the price of the robot barely matters. It's the third option — you — where it does.
A 21-inch push mower at walking pace covers 0.42 acres an hour with turns (deck width × speed ÷ 99 × 80% — the productivity formula the mowing trade uses), so 10,000 sq ft is 32 minutes a week and 16 hours a season. Count that time at $0 and mowing it yourself costs $118 a year in fuel, upkeep and a tenth of the mower — a $1,200 robot at $254 a year never catches up. Count it at $30 and the robot pays back in 3.4 seasons. Neither number is wrong. The calculator asks what an hour is worth to you because that, not the electricity, is the whole decision.
What your Saturday costs, by lawn size
| Lawn | Per mow | Hours / season | At $0 / h | At $15 / h | At $30 / h | At $50 / h |
|---|---|---|---|---|---|---|
| 5,000 sq ft | 16 min | 8 | $104 | $226 | $348 | $510 |
| 10,000 sq ft | 32 min | 16 | $118 | $362 | $605 | $930 |
| 20,000 sq ft | 65 min | 32 | $147 | $634 | $1,121 | $1,770 |
| 43,560 sq ft | 141 min | 71 | $214 | $1,274 | $2,335 | $3,749 |
21 in gas push mower (1.75 $/h of fuel, $400 over 10 years, $50 a year of upkeep), weekly for 30 weeks. An acre with a push mower is 71 hours a season — nobody does that; pick the rider in the calculator.
The five-year view
Payback is one number; the running total is what your bank account sees. The 10,000 sq ft example over five seasons — a $55 weekly service, mowing it yourself with your time at $25 an hour (and, honestly, at $0), and the $1,200 robot:
| After | Service | You, at $25/h | You, cash only | Robot |
|---|---|---|---|---|
| 1 season | $1,650 | $884 | $478 | $1,283 |
| 2 seasons | $3,300 | $1,369 | $557 | $1,366 |
| 3 seasons | $4,950 | $1,853 | $635 | $1,448 |
| 5 seasons | $8,250 | $2,821 | $792 | $1,614 |
Cumulative, purchases counted in season one (the $400 mower, the $1,200 robot), running costs each season after. "Cash only" is fuel and upkeep with your hours at nothing — the line the robot never crosses on a lawn this size.
Which robot for which lawn
| Class | Lawn up to | Typical price | What you get |
|---|---|---|---|
| Small (to ¼ acre) | 10,890 sq ft | $600–1,000 | Boundary wire or simple vision; fine for a flat suburban front-and-back. |
| Medium (¼–½ acre) | 21,780 sq ft | $1,000–1,800 | Wire-free RTK or vision models start here. |
| Large (½–1 acre) | 43,560 sq ft | $1,800–3,000 | RTK, all-wheel drive on slopes, multi-zone. |
| Extra large (1 acre +) | more | $3,000–5,000 | Commercial-adjacent; often two units are cheaper. |
Typical 2026 retail, not a catalog. Buy a class up if your lawn is near the top of one: a robot sized to its limit mows all day, and the battery — the part that decides the life — ages with every cycle. Boundary wire is cheaper and a weekend's work; RTK and vision models cost more, skip the wire, and handle the split-lawn case with a "passage" you carry them across.
What the robot actually costs to run
The manufacturer pages quote the electricity because it's tiny: a session is 100–150 Wh, so a season is 18.8 kWh and a few dollars. Blades are the real running cost — the little pivoting razors dull in six to ten weeks and a set is $15–30, so $80 a year is typical. And the number none of them print is depreciation: a $1,200 machine that lasts seven years costs $171 a year whether or not you think of it that way, and the battery is what decides the seven. Add an RTK or app subscription where the model has one, and installation — a boundary wire is a weekend or $200–400 from an installer; wire-free RTK models skip it and cost more.
What it doesn't do
Edges, trimming around posts and beds, leaves, and the strip along the fence — a robot mows the field and you (or the service, on a cheaper "trim only" visit) do the rest, which is why the calculator's service line should be the mowing part of the bill, not the whole landscaping contract. Slopes: most models stop around 35% grade, all-wheel-drive RTK models go further; measure the steepest bank before buying. Two lawns with no grass between them — front and back split by a driveway — are two zones the robot can't walk between; a wire-free model with a "passage" you carry it across, or two small units, is the honest answer. And the first season has a learning curve: stuck-on-a-root calls, boundary tweaks, a blade in the mulch. It's a season, not a lifetime.
Sources: LawnLove and Angi 2026 mowing-cost surveys (price per visit by lawn size); Toro / Encore Equipment mowing-productivity formula (acres per hour = width × mph ÷ 99 × efficiency); manufacturer running-cost figures for robotic mowers (Segway Navimow, FJDynamics, Husqvarna — session energy, blade intervals); typical class prices from 2026 retail listings, stated as typical.