What is the TCOOLR Score?
A transparent, data-driven way to compare the true cost of owning a robot lawn mower over five years.
Why Total Cost of Ownership?
The sticker price of a robot mower is just the beginning. Over five years you will replace blades, batteries, and wheels — and potentially pay for service and connectivity add-ons. TCOOLR puts all of these costs into a single, comparable number so you can make an informed decision.
How Is It Calculated?
We estimate the total 5-year cost by adding up every expense associated with purchasing and operating the robot:
- Purchase price (robot + charging station + 4G module if applicable)
- Blade replacements based on estimated annual mowing hours
- Battery replacements based on charge cycle wear (800-cycle lifespan)
- Annual service / maintenance costs
- Wheel replacement (one set over 5 years)
Mowing Hours & Lawn Size
Annual operating hours are estimated from the robot’s rated lawn size. A larger lawn means more daily runtime and therefore more consumable wear. We assume a 210-day Scandinavian mowing season (April–October) with daily runtime scaled between 3 and 14 hours depending on lawn area.
| Lawn size | Daily hours | Annual hours |
|---|---|---|
| 500 m² | 3 h | 630 h |
| 1 000 m² | 5 h | 1 050 h |
| 2 000 m² | 10 h | 2 100 h |
| 3 000+ m² | 14 h | 2 940 h |
The 1–100 Score
After computing the raw 5-year cost for every robot in our database, we normalise the results: the cheapest robot to own gets 100, the most expensive gets 1, and everything else falls linearly in between. A higher score means lower long-term cost. A score of 0 means we lack enough data to calculate it.
1 = most expensive · 100 = cheapest to own over 5 years
What About Missing Data?
When a robot is missing a cost field (e.g. battery price is unknown), we substitute the category average across all other robots that do have that data. This ensures no robot is unfairly penalised or rewarded for incomplete information.
Disclaimer
The TCOOLR score is an estimate based on publicly available specifications and reasonable assumptions. Actual costs will vary depending on usage patterns, local pricing, and individual conditions. The score is meant as a comparison aid, not a guarantee.