646A
Compatible HP 646A Cyan Toner Cartridge (CF031A)
12,500 pages
$79.99
Save 62% vs genuine
HP Laserjet CM4540fskm toner
Your Laserjet CM4540fskm takes the 646A (standard yield), 646A (standard yield), 646A (standard yield) and 646X (high yield). At our price that is about 0.5¢ a page.
The HP Laserjet CM4540fskm is a mono laser printer in the Laserjet CM4540 series, which shares cartridges across 3 models.
It takes two black cartridges that differ only in capacity: the 646A at about 12,500 pages and the 646X at about 17,000. At our prices that is 0.6¢ a page against 0.5¢, so the high-yield cartridge costs less to run unless you print very little.
On this printer the drum is built into the cartridge, so there is no separate drum to buy or reset. Every new cartridge brings a fresh drum with it.
When you compare prices, compare cost per page rather than the sticker price: a cheaper cartridge with half the rated yield costs more to run. Every cartridge here ships free, is covered by our printer damage protection and can be returned within 90 days, opened or not.
Cartridges that fit
646A
Compatible HP 646A Magenta Toner Cartridge (CF033A)
12,500 pages
$79.99
Save 64% vs genuine
646A
Compatible HP 646A Yellow Toner Cartridge (CF032A)
12,500 pages
$79.99
Save 64% vs genuine
646X
Compatible HP 646X Black High Yield Toner Cartridge (CE264X)
17,000 pages
$79.99
Save 58% vs genuine
Which yield is worth it
| Cartridge | Yield | Price | Per page |
|---|---|---|---|
| 646A | 12,500 pages | $79.99 | 0.6¢ |
| 646A | 12,500 pages | $79.99 | 0.6¢ |
| 646A | 12,500 pages | $79.99 | 0.6¢ |
| 646X High yield | 17,000 pages | $79.99 | 0.5¢ |
What it costs you a month
About $9.66 a month in toner, roughly one 646X every 3 months.
Questions about the Laserjet CM4540fskm
What toner does the HP Laserjet CM4540fskm use?
The 646A, 646A, 646A and 646X. HP lists these cartridges as compatible with this model, and the yields on this page are HP's published figures.
Does using a compatible cartridge void the Laserjet CM4540fskm warranty?
No. Under the Magnuson-Moss Warranty Act a manufacturer cannot void your warranty because you used a third-party cartridge. If one of ours damages the printer, our printer damage protection covers the repair.
Other HP Laserjet CM4540 models
Most of these share the same cartridges. Check the model page to be sure.
Guides for HP owners
Not your model?
Find your cartridge
or pick your printer
Page updated Sep 22, 2026. Compatibility checked by Dan Whitaker, Print Technician. Brand names and part numbers are used only to identify compatibility. We are not affiliated with or endorsed by any printer manufacturer.