The angle grinder injures more tradespeople than any other power tool, and the cordless generation has made the problem worse by removing the cable that used to limit how casually the tool got used.
So we tested for safety first and speed second. Six 125 mm cordless grinders, each measured for cuts per charge through 40 mm box section, brake stop time on high-speed video, and behaviour during a deliberately induced bind.
The results were not close. One grinder in this test has a genuine safety advantage over the others, and it is worth the price difference.
Why you can trust us. Tools Soko earns a commission when you buy through links on this page. It never changes what we recommend, and it never changes the price you pay.
At a Glance
| Award | Tool | Score | Price |
|---|---|---|---|
| Best Overall | Bosch GWS 18V-10 Angle Grinder | 9.4 / 10 | $129 |
| Best Value | Makita DGA504 Brushless Angle Grinder | 8.8 / 10 | $149 |
Our Picks in Detail
Best Overall: Bosch GWS 18V-10 Angle Grinder
The only grinder here that caught every induced kickback, with the fastest brake in the test at 1.6 seconds.
- KickBack Control cuts power on a pinch faster than you can react
- Wheel brake stops a disc in 1.6 s measured
- Consistent power delivery down to a nearly flat pack
Best Value: Makita DGA504 Brushless Angle Grinder
Lightest tool on test and nearly matches the Bosch on runtime, provided you can live without kickback detection.
- Lightest 125 mm cordless grinder in the test at 2.1 kg
- Electric brake included at this price
- Huge LXT battery ecosystem
What to Consider Before Buying
Kickback control is the feature that matters
A binding disc can twist a grinder out of your hands in under 100 milliseconds — faster than human reaction time. Electronic kickback detection is the only thing that reliably intervenes at that speed. If you cut unsupported stock or work overhead, treat it as essential.
Check the brake, and check the measured time
A wheel spinning down for eight seconds after you release the switch is eight seconds of exposed hazard. Most manufacturers now fit brakes, but stop times vary from under two seconds to over four. Very few publish the figure.
125 mm is the right size for almost everyone
115 mm saves little weight and costs real cut depth. 230 mm is a two-handed tool for a specific job. For general site work, 125 mm cuts 40 mm box section in one pass and still fits between studs.
Paddle switches beat slide switches
A paddle switch requires deliberate, continuous grip and releases the moment you let go. A slide switch stays on if the tool leaves your hand. In most jurisdictions the paddle is now the standard for professional use, for good reason.
Frequently Asked Questions
Is cordless powerful enough to replace a corded grinder?
For cutting and light grinding, yes — a modern 18V brushless grinder matches a 750 W corded tool. For sustained surface grinding or continuous work over an hour, corded is still the sensible choice on runtime grounds alone.
How many cuts should I expect from a charge?
In our test, 40–50 cuts through 40 mm mild steel box section on a 4.0 Ah pack. Thicker stock and grinding discs cut that figure sharply.
Can I use any brand of disc?
Any disc rated at or above the grinder’s no-load speed and matching the arbor. Never fit a disc rated below the tool’s rpm, and never remove the guard to fit a larger disc.
