A tiller is the one garden machine that makes noise on purpose. The tines hit soil, stones and roots dozens of times a second, and the gearbox and engine work hard to keep them turning. That makes declared figures more useful here than a spec sheet guess, and it also makes them rarer. Not one of the ten declared machines in this guide has a noise figure in its US documents.
Every figure below comes from the maker's own European or international manual for the same model, with the model match and any gaps written into each listing. Three makers declare properly: STIHL, EGO and Honda. They do not declare in the same way, which is why this guide has groups rather than one leaderboard.
Three ways of declaring, kept apart
STIHL's KombiSystem table. STIHL's BF-KM mini-cultivator is an attachment that fits its KombiEngines, and its manual lists the sound pressure at the ear under ISO 11201 and the sound power under ISO 3744 for every approved engine, all measured the same way: idling and rated maximum speed in a ratio of 1:6, with a K of 2.0 dB(A). That makes it the fairest comparison in the category. The battery KMA 135 R declares 74 dB(A) at the ear and 86 dB(A) sound power. The KMA 200 R ties it at 74 at the ear but declares 87 sound power. The KMA 80 R and KMA 120 R both declare 76 and 88.
Guaranteed sound power under 2000/14/EC. The EU noise directive covers tillers under the name motor hoes and requires a guaranteed sound power level, a ceiling the maker commits to. Three US-sold machines declare one. EGO's CTA9500 cultivator head declares 91 dB(A), Honda's F220 declares 92 and Honda's FG110 declares 93. We rank on that figure within this group and show the ear figures beside it, because the three ear figures come from three different methods: EGO names none, Honda cites prEN 1553 for the F220 and the machinery directive for the FG110.
EN 709 on its own. STIHL's MM 56 manual declares its BF-MM cultivator tines under EN 709, the European tiller safety standard: 87 dB(A) at the ear and 96 dB(A) sound power. No other machine here declares under EN 709, so the MM 56 C-E is shown in its own group, not ranked against the rest.
What the STIHL table proves
The BF-KM table is worth reading on its own because it isolates the engine. Same attachment, same tines, same measurement method, same document. On the gas KM 94 R the BF-KM declares 94 dB(A) at the ear and 106 dB(A) sound power; on the gas KM 131 R, 99 and 108. On the battery KMA 135 R it declares 74 and 86.
That is a 20 to 25 dB(A) gap at the ear between gas and battery with nothing else changed. Ten decibels is roughly a doubling of perceived loudness, so the battery machine is not a little quieter, it is in a different class. The gap in sound power is similar, 20 to 22 dB(A), which is what the neighbors experience.
The same table also shows that a bigger battery engine is not louder. The KMA 200 R, STIHL's most powerful KombiEngine, ties the KMA 135 R at the ear and sits one decibel above it in sound power. The KMA 80 R and KMA 120 R are two decibels louder at the ear than either.
The model mapping
STIHL's North American BF-KM manual, printed in English and French, has no noise section. The international English edition, 0458-478-0121-D, lists the same approved engines and carries the full table, so we quote it. The international names carry a generation suffix: the manual's "KMA 80.0 R" is the KMA 80 R sold by STIHL USA, and "KMA 200.0 R" is the KMA 200 R. The table's line for the KMA 135 R is printed as "KM 135 R"; there is no gasoline KM 135 R, and the manual's approved engine list names the KMA 135 R, so we read it that way and say so in the listing.
EGO sells the CTA9500 under the same model number in both markets. The EU manual gives a 240 mm tilling width, matching the 8 to 9.5 inch range on EGO's US page. The ear figure depends on the power head: 77.0 dB(A) on the PH1400E and 81.4 on the PH1420E. EGO USA now lists the PH1420, so a new buyer should expect the higher ear figure. The guaranteed 91 dB(A) is a single value for the attachment.
Honda sells the FG110 and F220 in both markets under the same names and with the same engines, a GX25 and a GXV57. The FG110 maps closely: a 9 inch (230 mm) tilling width and a similar weight. The F220 maps less neatly, because the EU manual gives a dry mass of 30 kg against 53 lb on Honda's US page, so the listing flags the difference rather than hiding it. Honda's European FJ500 has a full declaration too, but no FJ500 is sold in the US and no US Honda model matches its dimensions, so it is not in this guide.
Choosing by the job
For flower beds, borders and weeding between plants, a battery cultivator head is the quiet choice by a wide margin. The STIHL KMA 135 R with the BF-KM has the lowest declared pair of any machine STIHL USA sells, and the KMA 80 R is the value version two decibels behind. EGO's CTA9500 is the choice for owners already on EGO's 56 V batteries, with the lowest guaranteed sound power of the three guaranteed declarations.
For a vegetable garden where a 9 inch cultivator would take all afternoon, the F220 is a real 21 inch tiller, and its guaranteed 92 dB(A) is the lowest of the gas machines that declare one. The FG110 is the small four stroke for raised beds beyond the reach of a cord.
If you want one gas engine for cultivating, edging and trimming, the MM 56 C-E is STIHL's multi-tool, with a full EN 709 declaration.
The unweighted "93"
Sun Joe's product pages include a spec row reading "Decibels (dB) 93" for the TJ600E, TJ603E and TJ604E. It carries no A-weighting, does not say whether it is sound pressure or sound power, and names no distance or standard. The same 93 appears on a 6.5 amp, a 12 amp and a 13.5 amp model, which suggests one number reused across the range. The operator's manuals print nothing. We list the three in "also considered" so readers searching for them know why they are not ranked, and we do not compare the 93 with anything else in this guide.
The silent aisle
Several brands publish no noise figure for the US tillers and cultivators we checked. Greenworks shows none on its 40V and 80V cultivator pages, only the phrase "Low Noise". Champion Power Equipment's front tine and rear tine tiller pages and their English operator's manuals print none. Honda's US pages and US owner's manuals print none for any tiller, which is why the Honda figures here come from its European manuals; Honda's larger US FC600 and FRC800 are left out because we did not match them to a European manual. Husqvarna's US tiller address no longer shows a tiller range, and its TF 224 has a US support page for parts and manuals. Worx showed no tiller on its US site when we looked. None of these can be ranked, however quiet they might be.
The ear figure is what the operator hears and is what matters most on a machine you walk behind for an hour. Sound power is what the machine sends into the street, and the guaranteed value is the ceiling the maker commits to under EU law. They are different quantities and never ranked against each other; our sound power vs sound pressure explainer covers why, and the string trimmer guide uses the same approach for another garden tool. A three decibel difference is the smallest most people notice easily, so a one decibel gap between two cultivators is a tie in practice.
We did not measure any of these tillers or cultivators. Every figure is the maker's own, quoted as published in the document named in each listing, with the standard, uncertainty and measurement conditions wherever the maker gave them.
