A belt sander is the heavy hitter of the sanding family. A motor drives a loop of abrasive around two drums at well over a thousand feet a minute, and the whole flat underside of the tool bites into the work at once. It strips paint, levels glued up panels and takes down proud edges faster than any orbital sander. It also makes a lot of noise: the motor and fan, the belt slapping over the drums, and the grit tearing into wood all add up, and a big sanding job can keep the tool running for a long time.
Ten belt sanders sold in the US carry maker noise declarations we could read and match to the US model. Eight of them are the familiar 3 and 4 inch kind, on 3 x 18, 3 x 21, 3 x 24 and 4 x 24 inch belts, and at the operator's ear they run from 88 to 94 dB(A). Two more are Makita's narrow belt sanders for detail work, at 86 and 87. If you want a random orbital sander for finishing instead, our quietest orbital sanders guide covers those, and none of its sanders are repeated here.
The test behind the numbers
Makers selling in Europe declare sander noise under EN 62841-2-4, the standard for handheld sanders and polishers. It gives two quantities. LpA is sound pressure at the operator's position, the figure closest to what your ears get. LWA is sound power, the tool's total output, which is what the rest of the room gets. Each comes with a K value, the uncertainty, and every sander in this guide states a K of 3 dB.
We rank on LpA and show LwA beside it. Both come from the same test, but they measure different things and never belong in one ranking. The sound power vs sound pressure explainer covers why.
Makita's manuals cite EN62841-2-4 by name. HiKOKI's manuals for the Metabo HPT sanders say only EN62841, and Milwaukee's European page for its belt sander gives the figures with no standard at all. We found no belt sander with figures only under the older EN 60745 standard, so there is no separate older-standard group here.
None of it is printed for US buyers
Not one of the ten sanders has an A-weighted noise figure on its US page or in its US manual. Every figure we rank comes from the maker's European documents: Makita's EU manuals, HiKOKI's European handling instructions for the Metabo HPT sanders, and Milwaukee's EU product page.
What some US pages do print is a bare decibel number. Makita's US pages give "84dB" for the 9403, 9404 and 9920, and the 9903 page gives both 84 and 85 in different places. Metabo HPT's page for the SB8V2 lists a "No-Load Noise Level" of 87dB. None of these has an (A), a standard or a measuring position, and they are lower than the European declarations for the same tools, so they are not the same measurement. We record them in each catalog entry and leave them out of the ranking.
How we matched US models to European twins
Makita makes this easy. The 9903, 9920, 9404, 9403, 9924DB, 9031 and 9032 carry the same model numbers in both markets, and each European manual gives a belt speed in meters per minute that converts to the US page's figure in feet. The 9903 family's 210 to 440 m/min is the US 690 to 1,440 ft./min., and the 9403's 500 m/min is its 1,640 ft./min.
Metabo HPT is the US name of HiKOKI. The SB8V2 has the same model number in both markets, and the SB3608DA is the European name of the US SB3608DAQ4, where Q4 marks the tool only kit. Both speed ranges match: 250 to 450 m/min against 820 to 1,475 ft/min for the SB8V2, and 122 to 450 m/min against 400 to 1,475 ft/min for the cordless sander.
Milwaukee's US 2832-20 and European M18 FBTS75 are both M18 FUEL belt sanders on a 3 x 18 inch belt, and the EU page's 230 to 410 m/min is the US manual's 750 to 1,350 SFM. Each catalog entry states the pairing and the evidence. One caveat applies to the corded sanders: the declarations describe the 230 V European tools, and the US versions run on 120 V.
The 3 and 4 inch belt sanders
Four sanders tie for the lowest figure in this group, 88 dB(A) at the ear and 96 dB(A) sound power. Three are corded Makitas that share one European manual: the 3 x 21 inch 9903, the 3 x 24 inch 9920 and the 4 x 24 inch 9404. Because one declaration covers all three, it does not tell you whether the wider belt changes anything; Makita simply states the same pair for each. The fourth is Metabo HPT's cordless SB3608DAQ4, a 36V MultiVolt sander with five speeds and an auto mode that, Metabo HPT says, changes the speed with the load.
Makita's fixed speed 9403 comes next at 89 dB(A) and 97 sound power. It has the biggest motor here, 11 amps, and the fastest belt of the wide sanders, 1,640 ft./min., for only one decibel more at the ear than the variable speed 9404.
Milwaukee's 2832-20 is the only 3 x 18 inch sander with a figure we could match, and the only 18 V one: 90.0 dB(A) at the ear and 101.0 sound power on its EU page. It is compact and light at 7.5 lb, but its sound power is five decibels above the cordless Metabo HPT.
Two corded sanders sit at the loud end. Metabo HPT's SB8V2 declares 93 dB(A) at the ear and 101 sound power, and Makita's 3 x 24 inch 9924DB declares 94 and 102, the highest in this guide. The 9924DB has no speed control; Makita's variable speed 9920 declares six decibels less on the same belt size.
Narrow belt sanders
Makita's 9031 and 9032 run narrow belts, 1-1/8 and 3/8 inch wide, on a long arm, and are made for shaping, deburring and getting into corners and slots. They do different work from a 3 or 4 inch belt sander, so we rank them only against each other. The 9031 declares 86 dB(A) at the ear and 94 sound power, and the 9032 declares 87 and 95, both under EN62841-2-4. Those are the two lowest pressure figures in this guide, but they come from tools built for a different job.
The silent aisle
DEWALT's US manual for its DCW220 cordless 3 x 21 inch belt sander prints no noise figure, only a warning to wear hearing protection. Its UK page for the European DCW220NT lists specifications but no noise values, and it links no manual we could open, so the DCW220B is not ranked. We did not find DEWALT's corded DWP352VS on dewalt.com's US site.
RYOBI's US pages for the corded BE319 and the cordless P450, both 3 x 18 inch sanders, list no noise figures, and we did not find a European RYOBI belt sander we could match to either one. Bosch lists no belt sander on its US site, and Festool USA's sanders pages list none either. Makita's US site marks its 3 x 18 inch 9910 as discontinued. These sanders may be quiet or loud. The makers' documents that we read do not say.
What the spread means
Six decibels separate the quietest declaration from the loudest among the 3 and 4 inch belt sanders at the ear, a much tighter spread than among routers. For most buyers the choice comes down to belt size, power and whether you want a cord, and there is a sander declared at 88 dB(A) in the 3 x 21, 3 x 24 and 4 x 24 sizes, corded or cordless. Every one of these figures is loud enough that the makers tell you to wear hearing protection.
In use, grit and pressure matter as much as the tool. A coarse belt on hardwood is louder than a fine one on pine, and pushing down hard makes the motor labor. Let the weight of the sander do the work, use a dust bag or extractor so the belt is not clogged, and change belts before they glaze over.
We did not measure any of these belt sanders. Every figure is the maker's own, quoted as published, with the standard, K value and document identified wherever the maker identified them.
