Which tiller or cultivator does your garden need?

A small cultivator fluffs up a raised bed in minutes but bounces off clay sod. A big rear-tine tiller breaks new ground but is overkill for a vegetable patch. Describe your plot and we’ll size the machine, estimate how long the job takes and tell you whether renting or buying makes more sense.

Garden tiller calculator

1
Garden size
2
Ground
3
How you’ll use it
Leave prices empty to use typical US prices for the recommended machine.
Recommended machine–

–

Engine / motor–
Tilling width–
Time to till–
Fuel / energy–
–

Cultivator or tiller? The four main types

Electric & battery cultivators

8–11 in wide, light (20–30 lb), quiet and no fuel. Best for raised beds, small established gardens and weeding. They struggle with clay and sod.

Gas mini-tillers / cultivators

25–45 cc engines, 9–12 in wide. Light enough to lift into beds, strong enough for loam up to about 1,500 ft². Good for weeding between rows.

Front-tine tillers

140–210 cc, 16–24 in wide. The tines pull the machine forward, so you hold it back. Fine for existing gardens up to a few thousand square feet; tiring on hard ground.

Rear-tine tillers

200–300 cc, powered wheels, 16–20 in wide. Counter-rotating tines dig deep into sod and clay with much less effort. The right tool for new gardens and large plots.

How the calculator decides

The recommendation weighs three things: the size of the plot, how hard the ground is (soil type plus whether it has been worked before), and how deep you need to go. Breaking new ground is several times harder than refreshing an existing bed: you usually need two to four passes, in crossing directions, with a machine that has driven wheels. Clay and stony soils add more resistance, while sandy soil is easy for almost any machine.

How tilling time is estimated

Time = area ÷ (tilling width × walking speed × 0.75) × number of passes

Tilling is slow: around 25 ft per minute for a small cultivator and 35–40 ft per minute for a full-size tiller, and about 25% of the time is lost to turning at the end of each row and overlapping passes. Hard soils slow you down further. The number of passes depends on the ground: one or two for an existing bed, two or three for converting lawn, three or four for compacted, never-worked ground.

Typical machine by garden size

GardenExisting bedNew ground / sod
Up to 300 ft² (28 m²)Electric or battery cultivatorGas mini-tiller, or rent a rear-tine
300–1,500 ft² (28–140 m²)Gas mini-tiller / cultivatorRear-tine tiller (rent or buy)
1,500–5,000 ft² (140–465 m²)Front-tine tillerRear-tine tiller
5,000 ft² – ½ acreRear-tine tillerHeavy rear-tine tiller
Over ½ acre (2,000 m²)Tractor-mounted rotary tiller or a tilling service

Rent or buy?

Many gardeners only need a big tiller once a year, in spring. Renting a rear-tine tiller typically costs $60–100 a day in the US, while buying one costs $1,000–2,000. If you only break new ground once, rent the big machine and buy a small cultivator for weeding and mixing compost in later years. The calculator compares the purchase price with the rental cost for the number of uses you enter.

Tips for better results

FAQ

What size tiller do I need for a 20 × 20 ft garden?

A 400 ft² existing garden is easy work for a gas mini-tiller or a strong battery cultivator. If it’s new ground covered in grass, rent a rear-tine tiller for the first season.

Is a cultivator the same as a tiller?

Not quite. Cultivators are smaller machines that loosen the top few inches of soil and weed between rows. Tillers are larger and dig deeper, breaking new ground and mixing in compost.

Front-tine or rear-tine tiller?

Front-tine tillers are lighter, cheaper and fine for soft, established soil. Rear-tine tillers have powered wheels and dig deeper with far less effort, making them better for clay, sod and large gardens.

How deep should I till?

About 4–6 in (10–15 cm) for most vegetable seedbeds, 2–3 in for weeding and 8 in or more for new deep beds and root crops.

Can a battery cultivator break sod?

Generally no. Battery and electric cultivators lack the power and weight to cut through grass roots in compacted ground. Remove the sod first or use a rear-tine tiller.

How long does it take to till a garden?

An existing 1,000 ft² bed takes about 20–40 minutes with a full-size tiller. Breaking the same area of sod with a rear-tine tiller usually takes one to two hours, because it needs several crossing passes – longer in heavy clay.