Short answer: the size of an angle grinder is the diameter of the disc it takes. 115mm and 125mm grinders are light, one-hand tools for everyday cutting, grinding and polishing. 230mm grinders are big two-hand tools that cut much deeper, ideal for stone, concrete blocks, thick pipes and steel profiles.
Size comparison
| 115mm (4.5") | 125mm (5") | 230mm (9") | |
|---|---|---|---|
| Approx. cutting depth | About 30mm | About 35mm | About 65–70mm |
| Typical power | 700–900W | 900–1500W | 2000–3000W |
| Weight and handling | Lightest, easy one-hand control | Light, a little more reach | Heavy, needs two hands |
| Best for | Tiles, thin metal, rust removal, tight spaces | All-rounder for metal, tiles and light masonry | Stone, blocks, thick pipes, steel profiles |
Cutting depths are approximate and depend on the disc and guard.
115mm: the light all-rounder
The most popular size for homes and maintenance. It is easy to hold, fits in tight places and discs are cheap and widely available.
Angle Grinder 750W 115mm - TOTALView product →
Cordless Angle Grinder 20V 115mm (Tool Only) - TOTALView product →
Cordless Angle Grinder 42V 115mm with Battery - TOTALView product →
125mm: a bit more reach and power
Slightly deeper cuts than 115mm and often more powerful motors. A great choice for workshops, welders and tilers.
230mm: for deep, heavy cuts
For cutting stone, kerbstones, concrete blocks and thick metal. Always use both hands and a stable stance.
Angle Grinder 2200W 230mm - TOTALView product →
Angle Grinder 3000W 230mm - TOTALView product →
Cordless Angle Grinder 42V 230mm - TOTALView product →
Choose the right disc
- Cutting discs (thin): for metal or stone cuts.
- Grinding discs (thick): for removing welds and smoothing edges.
- Flap discs and wire brushes: for rust, paint removal and finishing.
- Diamond discs: for tiles, marble, granite and concrete.
Find discs and accessories in Grinding, Cutting & Polishing.
Safety rules that matter
- Never fit a bigger disc than the grinder is designed for, and never remove the guard.
- Check that the disc’s maximum speed (RPM) is equal to or higher than the grinder’s speed.
- Wear eye protection, gloves and hearing protection. See Personal Protective Equipment.
See all grinders in Grinding Machines.
Frequently asked questions
Can I put a 125mm disc on a 115mm grinder?
No. A bigger disc spins faster at its edge than it is rated for and will not fit under the guard, which is dangerous. Always use the disc size your grinder is designed for.
Which angle grinder size is best for home use?
A 115mm or 125mm grinder covers almost every home job: cutting tiles, metal bars, removing rust and sharpening tools.
Corded or cordless angle grinder?
Cordless grinders are ideal for quick cuts anywhere. For long cutting sessions or 230mm discs, corded grinders give continuous power.
