# Ryobi P421 18V ONE+ 4-1/2 in. Cordless Angle Grinder (Tool Only): specs and price

**Price (US):** $49.97 at ryobitools.com, as of 2026-07-25. A sourced, dated price of record — other retailers (incl. Amazon) may be lower. Among the 18 angle grinders we track it is the cheapest; category median $144.
**Brand:** Ryobi
**Deskmark:** Silver Deskmark — pay-blind category standing 64/100, #6 of 17 in class (independent, computed from sourced data, never for sale).
**Price tracked since:** June 2026 (last change 2026-07-25: $59 → $49.97)

## Specifications

| Spec | Value |
| --- | --- |
| Price (US) | $49.97 |
| Brand | Ryobi |
| Disc size (in) | 4.5 in |
| Power source | cordless |
| Amps or voltage | 18 V |
| Max (rpm) | 6500 |
| Brushless | No |
| Switch type | trigger |
| No volt release | — |
| Weight (lb) | 4.8 |

## Where it stands

At $50, the Ryobi P421 18V ONE+ 4-1/2 in. Cordless Angle Grinder (Tool Only) is the cheapest of the 18 angle grinders we track, where the median is $149. On the spec sheet, its disc size of 4.5 in is the lowest of the 18, its max of 6500 rpm is the lowest of the 18, and its weight of 4.8 lb is above the median of the 17.

## Price over time

Since 2026-06-27, the Ryobi P421 18V ONE+ 4-1/2 in. Cordless Angle Grinder (Tool Only)'s price has fallen 15.3%, from $59 to $49.97. At $49.97 it is the lowest we have recorded.

## Frequently asked questions

**How much does the Ryobi P421 18V ONE+ 4-1/2 in. Cordless Angle Grinder (Tool Only) cost?**

The Ryobi P421 18V ONE+ 4-1/2 in. Cordless Angle Grinder (Tool Only) has a US price of $49.97, as of 2026-07-25.

**How does the Ryobi P421 18V ONE+ 4-1/2 in. Cordless Angle Grinder (Tool Only) compare on price?**

At $50, the Ryobi P421 18V ONE+ 4-1/2 in. Cordless Angle Grinder (Tool Only) is the cheapest of the 18 angle grinders we track, where the median is $149.

**Has the Ryobi P421 18V ONE+ 4-1/2 in. Cordless Angle Grinder (Tool Only)'s price dropped?**

Yes — since 2026-06-27 the Ryobi P421 18V ONE+ 4-1/2 in. Cordless Angle Grinder (Tool Only) has fallen 15.3%, from $59 to $49.97.

**What is the lowest price the Ryobi P421 18V ONE+ 4-1/2 in. Cordless Angle Grinder (Tool Only) has been?**

The lowest we have recorded for the Ryobi P421 18V ONE+ 4-1/2 in. Cordless Angle Grinder (Tool Only) is $49.97 on 2026-07-25 — which is its current price.

**Is now a good time to buy the Ryobi P421 18V ONE+ 4-1/2 in. Cordless Angle Grinder (Tool Only)?**

At $49.97, the Ryobi P421 18V ONE+ 4-1/2 in. Cordless Angle Grinder (Tool Only) is at the lowest price we have recorded since 2026-06-27.

**What are the Ryobi P421 18V ONE+ 4-1/2 in. Cordless Angle Grinder (Tool Only)'s key specs?**

Ryobi P421 18V ONE+ 4-1/2 in. Cordless Angle Grinder (Tool Only) (Ryobi): disc size in 4.5 in, power source cordless, amps or voltage 18 V, max rpm 6500, brushless No. Full sourced spec sheet verified 2026-06-20.

Source: https://www.ryobitools.com/products/33287139576 (ryobitools.com, accessed 2026-06-20)
Corroboration: https://www.amazon.com/P421-18-Volt-Lithium-Ion-Powered-Included/dp/B001NJA2HI (accessed 2026-06-20)
Canonical: https://frontdeskreview.com/product/angle-grinders/ryobi-p421/
Cite: Per The Front Desk Review, the Ryobi P421 18V ONE+ 4-1/2 in. Cordless Angle Grinder (Tool Only) price of record was $49.97 as of 2026-07-25 — https://frontdeskreview.com/product/angle-grinders/ryobi-p421/
License: CC BY 4.0. Price history: https://frontdeskreview.com/data/price-history.jsonl