Short answer: A petrol lawn mower is typically 85–95 dB(A) at the operator’s ear, and ride-on mowers are similar or a little louder. Battery and electric mowers are quieter, roughly 70–85 dB. Petrol leaf blowers are the loudest common garden tool at about 95–105 dB at the operator. Using a petrol mower for more than about an hour without ear protection can harm hearing over time.
Garden machines are some of the loudest things most households own, and people often use them for an hour or more at a time. This post gives typical decibel levels for lawn mowers, leaf blowers, trimmers and chainsaws, compares them with everyday sounds, and explains how long you can use each one safely. It also covers hearing protection, neighbour-friendly hours and how to measure your own equipment with a phone.
Lawn Mower and Garden Tool Decibel Levels
The figures below are typical ranges at the operator’s ear. Actual levels depend on the engine, blade speed, grass height, the model’s age and how well it is maintained, so treat them as a guide rather than a specification.
| Machine | Typical dB(A) at the operator | Notes |
|---|---|---|
| Push petrol lawn mower | 85–95 dB | Louder at full throttle and in long grass |
| Ride-on mower or lawn tractor | 85–95 dB or more | Engine sits close to the rider; open cabs are loudest |
| Battery or corded electric mower | 70–85 dB | Mostly blade and wind noise, no engine |
| Robot mower | Roughly 50–65 dB nearby | Low level, but may run for hours |
| Petrol leaf blower (handheld or backpack) | 95–105 dB | Among the loudest common garden tools |
| Battery leaf blower | 80–95 dB | Varies a lot with the power setting |
| Petrol string trimmer (strimmer) | 90–100 dB | High-pitched two-stroke engine |
| Hedge trimmer | 85–100 dB | Petrol models at the top of the range |
| Chainsaw | 105–115 dB | Earmuffs are essential |
The (A) means A-weighted: the reading is adjusted to match how the ear hears different pitches. dB vs dB(A) explains the difference, and the decibel chart places these machines among hundreds of other sounds.
How Loud Is a Lawn Mower Compared With Other Sounds?
A petrol mower at around 90 dB is about as loud as a subway train pulling in or someone shouting at arm’s length; the 90 dB guide lists more examples. A leaf blower at 100 dB matches a car horn a few metres away, the level described in is 100 dB loud. A quiet battery mower at 75 dB is closer to a busy restaurant, as covered in what 75 dB sounds like.
Small differences in decibels are large differences in energy. Every 3 dB doubles the sound energy, and every 10 dB sounds roughly twice as loud, so a 100 dB blower carries ten times the energy of a 90 dB mower. The logarithmic decibel scale explains why.
Is a Lawn Mower Loud Enough to Damage Hearing?
Yes, with enough time. Hearing damage from noise depends on both level and duration. NIOSH recommends a limit of 85 dB(A) for 8 hours, and halves the time for every 3 dB above that. OSHA, the US legal limit, allows 90 dB(A) for 8 hours and halves the time every 5 dB. OSHA and NIOSH noise limits explains both rules in detail.
| Level at the ear | Typical garden tool | NIOSH safe time | OSHA limit |
|---|---|---|---|
| 85 dB | Quiet petrol mower, loud battery mower | 8 hours | 16 hours (by formula) |
| 90 dB | Petrol mower | 2 h 31 min | 8 hours |
| 95 dB | Loud mower, strimmer | 48 minutes | 4 hours |
| 100 dB | Petrol leaf blower | 15 minutes | 2 hours |
| 105 dB | Loud blower, chainsaw | About 5 minutes | 1 hour |
So an hour of mowing at 90 dB uses less than half of the NIOSH daily allowance, while 15 minutes with a 100 dB blower uses all of it. If you mow and then blow the paths, the doses add up; the noise exposure calculator works out the total for a mix of tools. The first signs of overexposure are ringing (tinnitus) or muffled hearing after the job. That usually fades within a day, but repeated episodes lead to permanent loss. If your hearing does not feel normal the next day, try the online hearing test as a first check and see a doctor or audiologist.
Leaf Blower Decibels: Operator vs Neighbour
Petrol leaf blowers are the garden tool people complain about most. At the operator’s ear they are often 95–105 dB, because the engine and fan are close to the head on backpack models. The neighbour hears much less, since sound falls by about 6 dB each time the distance from a small source doubles. A blower at 100 dB at 1 m would be roughly 76 dB at 16 m in open ground, before any walls or fences reduce it further.
Distance helps the neighbour, but not the operator. The decibel calculator works out how a level changes with distance. Blowers are also annoying out of proportion to their level: the two-stroke engine drone carries far, and the noise is often on for long periods. The frequency analyzer shows how much low-frequency engine energy a machine produces.
Hearing Protection for Mowing and Blowing
- Wear earmuffs or foam earplugs for any petrol tool. In real use they typically cut 10–20 dB, which brings a 95 dB mower down to a safe 75–85 dB.
- Fit plugs properly: roll foam plugs thin, pull the ear up and back, and hold them in while they expand.
- Use double protection for chainsaws: plugs plus earmuffs, or a forestry helmet with built-in muffs.
- Choose battery tools where they do the job: they are often 10 dB or more quieter at the operator.
- Split long jobs into shorter sessions with quiet breaks, and keep machines serviced; loose parts and blunt blades add noise.
The safe noise levels chart shows where the risk starts, and the 85 dB guide explains why that level is the usual starting point for protection.
Neighbour-Friendly Mowing Hours
Rules differ between countries, cities, councils and homeowners’ associations, so check your local rules first. As general courtesy, avoid petrol mowers and blowers early in the morning, late in the evening and early on weekend and holiday mornings, and keep noisy jobs as short as you can. Mid-morning to early evening on weekdays is usually the least disruptive time. If a neighbour’s garden machinery is a real problem, noise complaint levels explains what counts as excessive and how to make a complaint, and the noise monitor can log how long the noise lasts.
How to Measure Your Lawn Mower’s Decibels
- Open the free decibel meter on your phone and allow microphone access.
- Hold the phone near your ear position (or have a helper do it) while the mower runs at normal working speed.
- Shield the microphone from wind and keep it out of the grass spray; wind noise adds false low readings.
- Record for 30–60 seconds and note the average, not just the peak.
- For a neighbour’s view, repeat at the boundary or at their window.
Phone microphones read reliably up to about 100 dB once calibrated, but many compress above roughly 100–120 dB, so a leaf blower or chainsaw may read too low. See how to calibrate a microphone, how to measure decibels and online decibel meter accuracy for the limits.
In the EU and UK, outdoor machines such as mowers and blowers carry a label with a guaranteed sound power level (LWA), required by the outdoor equipment noise directive (2000/14/EC). Sound power describes the total noise the machine emits and is usually a higher number than the sound pressure level you measure at your ear, so the two figures can’t be compared directly. They are useful for comparing models with each other.
Frequently Asked Questions
How many decibels is a lawn mower?
A petrol push mower is typically 85–95 dB(A) at the operator’s ear, a ride-on mower similar or louder, and a battery or electric mower roughly 70–85 dB.
How loud is a leaf blower in decibels?
Petrol leaf blowers are usually 95–105 dB at the operator. At a neighbour’s house they are much quieter, often in the 60s or 70s, depending on distance and walls.
Should you wear ear protection when mowing the lawn?
Yes, for petrol mowers. At 90 dB, NIOSH recommends no more than about 2.5 hours a day, and a large garden plus trimming can exceed that. Earmuffs or plugs make it safe.
Are electric lawn mowers quieter?
Yes. Without an engine, battery and corded mowers are often 10 dB or more quieter, which sounds about half as loud. Many owners still wear light protection for long sessions.
Is a chainsaw louder than a lawn mower?
Yes. A chainsaw at 105–115 dB has 30 to 300 times the sound energy of a 90 dB mower, and NIOSH allows only a few minutes a day without protection.
Addito is an audio analysis and sound measurement writer specializing in decibel testing, noise level analysis, sound frequency measurement, and audio engineering tools for creators, audio professionals, students, and everyday users. He creates practical content focused on sound measurement, hearing safety, microphone testing, and acoustic analysis tools.