What Size Petrol Chainsaw Do You Need for Farm Work in AU?

Last Updated on July 31, 2026 by Ellen Christian

Most farm owners do not need the biggest petrol chainsaw on the shelf. A saw that is too large becomes tiring after a short time, especially when you are trimming branches, cutting posts, or cleaning up around paddocks. On the other hand, a saw that is too small can turn simple farm jobs into slow, frustrating work.

The right size depends on what you cut most often, how thick the timber is, and how regularly you use the saw. For most farm work in Australia, the best petrol chainsaw is usually one that balances bar length, engine power, and weight.

Bar Length Is the First Thing to Check

Bar length tells you how much timber the chainsaw can cut through in one pass. For farm use, this matters because different jobs need different cutting reach.

A shorter bar is easier to control, which makes it better for pruning, trimming branches, clearing small fallen trees, and general property maintenance. A longer bar is more useful when cutting larger logs, fallen trees, or heavier timber around the farm.

For example, Jono & Johno’s chainsaw range can help farm owners compare different bar lengths and choose a petrol chainsaw that suits their regular cutting tasks, from pruning and firewood work to heavier farm cleanup. It can also help to compare models with other suppliers, such as Green Acres Mowers, so you can check differences in bar size, engine capacity, weight, and cutting power before buying.

For light farm jobs, a 14- to 16-inch bar is usually enough. This size works well for pruning trees, cutting small branches, clearing storm debris, and handling smaller logs.

For regular farm use, a 16- to 20-inch bar is often the better choice. It gives enough cutting capacity for firewood, fence posts, medium logs, and general paddock cleanup without becoming too heavy to manage.

For heavier farm work, such as cutting large fallen trees or mature hardwood, a 20-inch bar or longer may be needed. However, bigger is not always better. A longer bar also needs a stronger engine and more control, so it should only be chosen if your farm work genuinely requires it.

Engine Size Matters Just as Much

The engine size, measured in cc, shows how much power the saw has. This is important because a long bar with a weak engine will not cut well. It may slow down, overheat, or put extra strain on the saw.

A 30cc to 40cc petrol chainsaw is suitable for light farm maintenance. It can handle pruning, small branches, light firewood, and basic cleanup jobs. These saws are easier to start, lighter to carry, and more comfortable for occasional use.

A 40cc to 55cc petrol chainsaw is the best range for most farm owners. This size can usually run a 16- to 20-inch bar and handle regular cutting without feeling underpowered. It is suitable for cutting firewood, trimming trees, clearing fallen branches, cutting posts, and dealing with mixed farm timber.

A 55cc or larger petrol chainsaw is better for demanding farm work. This includes cutting large hardwood, clearing heavy storm damage, felling mature trees, or using the saw for long periods. These saws are powerful, but they are also heavier, louder, and more tiring to use.

Match the Chainsaw Size to Real Farm Jobs

The best way to choose a petrol chainsaw is to think about the jobs you do most often. Farm work can include many different tasks, and each one needs a slightly different balance of power and control.

Fencing and Post Work

For cutting fence posts, trimming rails, or notching timber, you usually do not need a very large saw. These are controlled cuts, often done on dry or semi-dry timber.

A 16-inch bar with a 40cc engine is usually enough for this type of work. It gives you enough power without making the saw too heavy to handle around posts, yards, sheds, or fencing materials.

Storm Cleanup

Storm cleanup can be more demanding. Fallen branches and trees may be under tension, lying across fences, or sitting at awkward angles. In these situations, you need a saw with enough reach and power to cut safely and cleanly.

An 18- to 20-inch bar with a 45cc to 55cc engine is a practical choice for most farm storm cleanup. It gives you more cutting capacity than a small saw while still being manageable for longer sessions.

Firewood Cutting

If you regularly cut firewood on your property, a mid-sized petrol chainsaw is usually the best option. Firewood cutting involves repeated cuts, so weight and comfort matter just as much as power.

An 18-inch bar with a 45cc to 50cc engine is a strong choice for most firewood work. It can handle medium logs without wearing you out too quickly. If you mostly cut smaller timber, a 16-inch bar may be enough. If you often cut larger hardwood, moving closer to a 20-inch bar may make more sense.

Cutting Larger Trees or Heavy Timber

For larger trees, mature hardwood, or heavy fallen logs, you need more engine power. A small saw may still cut, but it will work slowly and place more strain on the engine.

For this kind of farm work, a 20-inch bar with a 55cc or larger engine is more suitable. This size gives the saw enough power to keep the chain moving through dense timber. However, it should only be used by someone comfortable handling a heavier saw.

So, What Size Petrol Chainsaw Is Best for Farm Work in AU?

For most Australian farm owners, a petrol chainsaw with a 16- to 18-inch bar and a 40cc to 55cc engine is the most practical choice. This size covers general property maintenance, fencing work, firewood cutting, tree trimming, and most storm cleanup jobs.

If your work is mostly light pruning and small branches, a 14- to 16-inch bar with a 30cc to 40cc engine should be enough.

If you cut firewood regularly or deal with medium logs, an 18-inch bar with a 45cc to 50cc engine is usually a better fit.

If your property has large trees, heavy hardwood, or frequent storm damage, you may need a 20-inch bar or larger with at least 55cc of engine power.

Conclusion

The right petrol chainsaw for farm work in AU is not always the biggest one. It is the one that matches your timber size, your workload, and your comfort level.

For most farm tasks, a 16- to 18-inch bar with a 40cc to 55cc engine offers the best balance of power, control, and everyday usability. Go bigger only if you regularly cut large trees, thick hardwood, or heavy storm-damaged timber. A well-matched saw will cut faster, feel safer, and last longer when used properly.