Zero-Turn vs. Robot Mower: The True 5-Year Cost
Drag the slider to your acreage. Everything below recalculates instantly.
HOW MANY ACRES DO YOU MOW?
3 acres
0.512
HOW MANY YEARS?
5 years
110
Terranox CM120M1 vs 60″ zero-turn
5-YEAR TOTAL COST
$5,972
CM120M1 · $5,499 upfront
$9,037
60″ zero-turn · ~$6,500 upfront
TOTAL SAVINGS
~$3,064
saved vs. the zero-turn
208 hours
of your life back over 5 years
GAS VS ELECTRIC
~$207/yr vs ~$20/yr
~$207/yr vs ~$20/yr
UPKEEP
$300/yr vs $75/yr
$300/yr vs $75/yr
YOUR TIME
42 hrs/yr vs 0
42 hrs/yr vs 0
How the calculator works
- Gas $3.84/gal & electricity 18.2¢/kWh — EIA 2026 annual forecasts. 30 mows/year (weekly, ~7-month season).
- The matchup picks itself: up to 1 acre → X430 · to 1.5 → X450 · to 3 → CM120M1 · to 6 → CM240M1 · over 6 → two CM240M1 units. Zero-turn: to 2 acres → 54″ (~$4,700) · to 4 → 60″ (~$6,500) · over 4 → 72″ (~$15,000, commercial-grade).
- Zero-turn prices are typical street prices per deck size (live dealer/retailer listings, Sept 2026; prices vary by dealer & region).
- Fuel burn estimated from engine size (manufacturers don’t publish gal/hr). Mow times assume realistic ground speeds (5–7 mph) and 65% field efficiency — trees, overlap, and turnarounds included.
- Robot electricity ~1.2 kWh/acre/mow from published battery & charger specs. Robot upkeep ~$75/yr per unit in blades; battery replacement not included.
- All figures rounded.