What Size Lawnmower Do You Actually Need? From a 32cm Electric to a Lawn Tractor

Walk into any showroom and the first question you'll hear is "what brand do you like?" It's the wrong question. The mower that suits you is decided by your lawn: how big it is, how far it sits from a plug socket, whether it slopes, and how you want the clippings handled. Get the size and power right and almost any well-built machine will serve you for years. Get it wrong and you'll either fight an underpowered mower every weekend or pay for capability you never use.

This guide walks up the ladder rung by rung, from a 32cm electric mower for a courtyard lawn to a hydrostatic lawn tractor for a paddock, with honest advice on when to step up.

Why size and power matter more than brand

Three numbers do most of the deciding:

• Cutting width decides how many passes a lawn takes. A 46cm deck covers roughly 40% more grass per pass than a 32cm one.
• Power source decides your range. A corded mower reaches as far as its cable; petrol goes anywhere.
• Drive decides the effort. Push mowers are fine on small, flat lawns. Self-propelled drive earns its keep on slopes and anything over about 300m².

A wider deck is not automatically better. On a small lawn with beds and borders, a big mower is clumsy, heavy to turn and awkward to store. The right machine is the smallest one that finishes your lawn without the job dragging.

Quick answer: match the machine to the lawn

The ladder, rung by rung

Rung 1: town and courtyard lawns, up to about 100m²

If your lawn takes less than 20 minutes to walk over, a compact corded electric mower is the sensible buy. The Spectrum TG32E is built for exactly this job: a quiet 1300W induction motor, a 32cm cut that stays nimble around borders, and a 30-litre collector that empties in seconds.

At 10kg it lifts up steps without a struggle, and the handle folds flat so it stores in the smallest shed or under the stairs. Six cutting heights run from 25mm to 75mm, set independently on each axle. The 15-metre cable covers a typical town garden without an extension lead. Like every Spectrum machine, it carries a 5-year warranty.

Step up when: the weekly cut starts feeling slow, or your lawn stretches past what a 32cm deck finishes comfortably.

Rung 2: small-to-medium lawns, up to about 250m²

The Spectrum TG36E adds a stronger 1600W motor, a 36cm deck and a 40-litre collector, so you make fewer passes and fewer trips to the compost heap. A single lever adjusts the cut across six heights, and the 20mm minimum is unusually low for a rotary electric, ideal if you like a closely cropped finish.

It still weighs just 13kg and folds away like its smaller sibling, and it carries the same Spectrum 5-year warranty. For most small-to-medium gardens within reach of a socket, this is the sweet spot of the corded range.

Step up when: the cable becomes the job. If you're managing two extension leads, flicking cord around trees or the far end of the lawn is out of reach, you've outgrown corded electric.

Rung 3: medium-to-large lawns, slopes, and gardens without a socket

The Spectrum TG46PD is the first petrol rung, and it changes two things at once. There's no cable, so lawn size stops being limited by reach. And the 139cc engine drives the wheels, so on slopes and uneven ground the mower does the pushing while you steer.

The 46cm steel deck clears medium-to-large lawns up to around 400m² in noticeably fewer stripes. Seven cutting heights from 25mm to 75mm adjust with one lever. You can collect into the 40-litre grassbox or fit the included mulching plug and feed the clippings back into the turf. It's backed by Spectrum's 5-year warranty, which is rare at this price for a petrol machine.

Step up when: you want a third way to handle clippings, or the lawn is big enough that even a self-propelled walk-behind takes over an hour.

Rung 3, the 3-in-1 alternative: Chipperfield JET46AD

At the same 46cm width, the Chipperfield JET46AD trades up on flexibility. Its 144cc engine drives a full 3-in-1 deck: bag clippings in a roomy 60-litre collector, fit the mulching plug, or open the side-discharge chute when the grass has got long and thick and collecting would mean stopping every two minutes.

That side-discharge mode is the reason to choose it over the TG46PD. If your lawn sometimes gets away from you between cuts, or you mow a rougher patch beyond the main lawn, the JET46AD copes without complaint. At 26kg with folding soft-grip handles, it's still easy to store.

Step up when: the mowing takes longer than you're willing to walk. Somewhere around half an acre, a walk-behind stops making sense however good it is.

Rung 4: large gardens and small paddocks, with a collecting finish

Once you're mowing half an acre or more every week, a lawn tractor pays for itself in time. A 95cm twin-blade deck covers more than double the grass per pass of any walk-behind, and you're sitting down while it does it.

The Chipperfield T16-38HC is the collecting option. Its 449cc engine pairs with a foot-pedal hydrostatic transmission: no gears, just press and go, up to 9km/h. Clippings feed into a 240-litre rear collector with a buzzer that sounds when it's full, so you empty when it needs it rather than guessing. A tight 600mm turning radius keeps it agile around beds and borders, and electronic blade engagement means the cutting deck starts and stops from the seat.

Rung 5: large, rougher areas where collecting isn't needed

The Chipperfield T16-38HSD shares the same engine, hydrostatic drive and 95cm deck, but discharges clippings out of the side and back onto the grass, where they break down and feed the turf. No collector to empty means no stopping, which is exactly what you want on paddocks, orchards and the further reaches of a big plot where a striped finish isn't the point.

Cutting heights on both tractors run from 25mm to 100mm, so they'll take long, neglected growth down in stages. If your ground has gone properly wild first, read our guide to clearing an overgrown garden, paddock or allotment before you put a mower on it.

Corded electric vs petrol: the honest trade-offs

Neither is better. They solve different problems.

• Corded electric wins on price, weight, noise and upkeep. No fuel, no oil changes, no winter starting ritual. Push a button and mow.
• Corded electric loses on reach. The cable is a hard limit, and dragging it around trees, beds and washing lines gets old quickly on anything but a simple lawn.
• Petrol wins on range and power. It mows any size of lawn, any distance from the house, and shrugs off long or damp grass that would bog a small electric down.
• Petrol asks for fuel in the shed, an oil check now and then, and a service habit. Modern recoil starts are easy, but it's still more machine to look after.

The practical rule: if the whole lawn sits within 15 metres or so of a socket and it's mostly flat, corded electric is cheaper to buy and simpler to live with. The moment slope, distance or lawn size makes the cable a nuisance, move to petrol and let the drive wheels do the work.

Collect, mulch or side-discharge?

Collecting gives the tidiest finish. Clippings go into the box, the lawn looks clean, and there's less thatch build-up. The cost is time: every full box is a walk to the compost heap.

Mulching chops clippings finely and drops them back into the sward, where they rot down and return nutrients. Done little and often on a dry lawn, it's a free lawn feed and there's nothing to empty. It struggles when grass is long or wet.

Side-discharge throws clippings clear of the deck in a swath. It's the mode for long, thick or overgrown grass, because the deck never clogs and you never stop. The finish is rougher, so it suits paddocks and outlying areas rather than the front lawn.

This is why the ladder looks the way it does: the TG46PD gives you collect and mulch, the JET46AD adds side-discharge, and at the top the two tractors split along the same line, T16-38HC for collecting, T16-38HSD for discharge.

FAQs

What size lawnmower do I need for my garden?

As a rule of thumb: up to about 100m², a 32cm electric is ideal; up to about 250m², a 36cm electric; up to about 400m², a 46cm self-propelled petrol; beyond roughly half an acre, a lawn tractor saves hours every month. Measure the lawn, not the garden. Beds, patios and paths don't count.

What is the best lawnmower for a small garden?

A light corded electric with a 32cm to 36cm cut. It's cheap to buy, quiet, needs almost no maintenance and stores in a small space. The Spectrum TG32E and TG36E both fold flat and weigh 13kg or less.

Is a petrol mower better than an electric one?

Only when you need what petrol offers: unlimited range, more power for long or damp grass, and self-propelled drive for slopes. On a small, flat lawn near a socket, a corded electric does the same job with less cost and upkeep.

When is a lawn tractor worth it?

Around the half-acre mark, or sooner if you mow weekly in season. A 95cm deck at up to 9km/h turns a two-hour walk into a 30-minute sit-down, and a hydrostatic transmission makes it as easy to drive as a pedal car.

Should I collect, mulch or side-discharge my clippings?

Collect for the neatest finish on show lawns. Mulch little and often in dry weather to feed the lawn for free. Side-discharge when grass is long, thick or rough, because the deck won't clog and you never stop to empty.

Ready to choose?

Start where your lawn puts you on the ladder. For small gardens, the Spectrum TG32E and TG36E cover the corded rungs, and the Spectrum TG46PD takes over where the cable runs out, all with Spectrum's 5-year warranty. Browse the full lawnmower range to compare widths and power sources, or head straight to lawn tractors if you're mowing by the acre.