Petrol Lawn Mower Fuel Cost & CO₂ Emissions Calculator

Compare petrol usage, annual fuel cost and CO₂ emission for different lawnmower engine sizes (100–130cc, 131–170cc, 171–220cc). Enter hours per month and petrol price for a quick UK-based calculation.

How Thirsty Is Your Mower Really?

You might love the purr of a petrol mower's motor, but under the bonnet it's quietly guzzling petrol and emitting CO₂ every time you mow. If you're choosing between engine sizes or just curious about the environmental and running-cost impact of your mower, this calculator gives you that at a glance.

Small, Mid, Big cc - What's the Difference?

Small engines (100–130cc) are fuel-efficient and ideal for small lawns. Medium engines (131–170cc) offer a compromise between power and economy for larger or tougher patches. Large engines (171–220cc) offer grunt if you're cutting big lawns, slopes or thick grass, and they consume more fuel in doing so.

What This Tool Does

Just pick an engine size, enter how many hours a month you typically use it, and tweak the petrol price. The calculator estimates litres per month and per season, yearly fuel cost, and CO₂ emissions in kilograms. The calculator uses conservative, real-world burn-rate estimates so the figures reflect real-world usage, not theoretical laboratory figures.

Why It Matters

Over the course of a season these disparities add up. A small mower will use perhaps a few dozen pounds of petrol a year; a large engine will double that and emit quite a bit more CO₂. Knowing the numbers allows you to make a choice whether that means buying a different mower, changing mowing habits, or considering an electric model.

Final Word

Numbers never lie, they just allow you to choose. If your mower's appetite (and carbon footprint) appears too big, you can balance whether additional grunt is worth the expense. Try a few engines sizes and hours combinations, then leave a comment with what you discover, it helps others make smarter, greener choices for their lawns.