Brother TN645, TN645XL & TN645XXL Toner Cartridges
Brother TN645, TN645XL and TN645XXL toner cartridges provide tailored print options for your Brother office printer, available in standard, high and ultra-high yield variants. Scaling up to XXL cartridges lowers overall page costs during demanding workplace print runs while maintaining consistent reliability across all document runs. Our 4.8 Google Star rating shows that our customers consistently receive high-quality cartridges backed by reliable performance.
Printers Compatible with Brother TN645, TN645XL & TN645XXL Toner Cartridges
Expected page output and replacement cycles
Brother calculates page yields using the ISO/IEC 19798 standard for colour laser printing at approximately 5% coverage. Black cartridges range from 3,000 pages (standard) up to 7,500 pages (XXL), while colour cartridges yield between 1,800 and 6,500 pages depending on whether standard, XL, or XXL capacities are selected.
| Cartridge Number | Type | Colour | Page Yield | Cost Per Page |
|---|---|---|---|---|
| TN645BK | Standard | Black | 3,000 | $0.060 |
| TN645C | Standard | Cyan | 1,800 | $0.10 |
| TN645M | Standard | Magenta | 1,800 | $0.10 |
| TN645Y | Standard | Yellow | 1,800 | $0.10 |
| TN645XLBK | High Yield | Black | 5,500 | $0.042 |
| TN645XLC | High Yield | Cyan | 4,500 | $0.075 |
| TN645XLM | High Yield | Magenta | 4,500 | $0.075 |
| TN645XLY | High Yield | Yellow | 4,500 | $0.075 |
| TN645XXLBK | Extra High Yield | Black | 7,500 | $0.033 |
| TN645XXLC | Extra High Yield | Cyan | 6,500 | $0.069 |
| TN645XXLM | Extra High Yield | Magenta | 6,500 | $0.069 |
| TN645XXLY | Extra High Yield | Yellow | 6,500 | $0.069 |
Cost Per Page = Total Cartridge Price ÷ Page Yield (at 5% coverage). Prices based on Genuine cartridges.
Choosing the right cartridge setup
If your workplace produces mostly text, standard black toners cover basic demand, but switching to TN645XXLBK cuts black cost per page nearly in half. For high-volume colour printing, XXL cyan, magenta, and yellow cartridges offer maximum operational savings. All purchases are backed by our returns policy. Free delivery applies on all orders over $99 with fast dispatch from our warehouses in Perth, Brisbane, Sydney, Melbourne and Adelaide. Browse our full range of Brother toner cartridges to suit your operational needs.
Pro Tip
Colour laser printers use small amounts of cyan, magenta, and yellow toner during routine calibration and monochrome printing cycles. Upgrading all four positions to TN645XXL cartridges simultaneously prevents uneven depleted cartridge replacements and minimises overall maintenance downtime.
Choose Between Brother TN645 & TN645XL Toner Cartridges
Replace the Complete Colour Set
For a full refresh across every colour, the 4-Pack TN645 Genuine (from $722.58) is the complete-set option and qualifies for free delivery.
Print More with XL Cartridges
Stretch the time between orders with the 4-Pack TN645XL Genuine (from $1,220.51), which covers every colour at a higher yield and also qualifies for free delivery.
Replace Just One Colour
If only one colour has run dry, there's no need to replace the rest - a single Genuine TN645 Black cartridge (from $179.14) lets you replace only the colour that has run out.
Reduce How Often You Replace Cartridges
For the longest run between reorders, the Genuine TN645XXL Black Extra High Yield cartridge (from $245.34) offers the highest capacity available and qualifies for free delivery.
Frequently Asked Questions
Can I mix standard TN645 and ultra high yield TN645XXL cartridges in the same printer?
Yes, you can freely mix standard, XL, and XXL capacity cartridges across different colour slots. The physical cartridge dimensions and fitting mechanisms are identical; only the internal toner volume varies.
Why do colour toners deplete even if I mostly print in monochrome?
Brother colour laser printers automatically execute periodic calibration and registration adjustments that consume small amounts of cyan, magenta, and yellow toner to ensure precise alignment.
How do I know when to replace the toner cartridge versus the drum unit?
The toner cartridge holds the fine colour powder, while the drum unit transfers that powder onto the paper. Your printer will display explicit, separate alert messages when the toner cartridge needs replacement versus when the drum assembly reaches its operational end-of-life.
Is TN-645XXL the same as TN645XXL?
Yes, TN-645XXL and TN645XXL refer to the exact same Brother ultra-high-yield toner cartridge; the hyphen is just a common formatting variation used by some retailers.
