Where to find your ink level in HP's printer software
The quickest way to check ink is through HP's printer software on your computer. Open the HP Smart app (if you have it installed) or search your computer for "HP" in the applications menu — you'll find either HP Smart, HP Printer Assistant, or HP ToolboxFX depending on your printer model and when you bought it. The app shows your current ink levels as a percentage or a visual bar for each color cartridge.
If you don't have the app installed, you can read it free from HP's website. Search for your specific printer model number (it's on the front or back of the printer) and read the software bundle. Once installed, the app will connect to your printer over your home network and display ink levels automatically.
This method works whether your printer is connected by USB cable or WiFi. The software checks the printer's internal sensors, which track how much ink remains in each cartridge as you print.
Key Takeaways
- HP Smart app or HP Printer Assistant shows ink levels as percentages or bars for each color cartridge.
- You can read the free software from HP's website by searching your printer's model number.
- The printer's control panel also displays ink levels on its built-in screen if your model has one.
- Ink level sensors can show cartridges as empty when they still have usable ink, so physical inspection confirms what the software reports.
- Third-party cartridges may not report accurate levels to HP software, even if they work for printing.
Checking ink levels on your printer's control panel
Many HP printers have a small screen or display panel on the front. If yours does, press the button labeled "Information," "Status," "Menu," or a home icon — the exact label depends on your model. Navigate to "Ink Status," "Supplies," or "Cartridge Status" using the arrow buttons, then press OK or Select.
The display will show the remaining ink for each color (black, cyan, magenta, yellow). Some printers show percentages; others show a visual bar. This method works without a computer and doesn't require software installation.
If your printer has no display panel — some basic models don't — you'll need to use the software method or check the cartridges by hand.
What the ink level sensors actually measure
HP printers use optical sensors inside the cartridge slot to detect how much ink is left. As you print, the sensor tracks the cartridge's position and estimates remaining ink based on how much has been used. This is an estimate, not a precise measurement, which is why the software sometimes shows a cartridge as empty when it still prints.
The sensors work best with genuine HP cartridges. Third-party or refilled cartridges may not have the same sensor design, so the printer can't read their levels accurately. You might see "unknown" or "low" for a third-party cartridge even if it's half full.
Ink level readings also assume you're using the cartridge normally. If you've stored the printer for months or used it very lightly, the sensor's estimate may be off by several percentage points.
When ink level warnings appear on your screen
HP printers send notifications to your computer when ink is running low. If you have HP Smart installed, you'll see a pop-up message or a notification in the app itself. The message typically appears when a cartridge reaches 20 percent, though some models warn at 15 or 25 percent depending on the cartridge type.
These warnings are informational — they don't stop you from printing. You can usually dismiss the notification and keep printing until the cartridge is truly empty. However, printing with very low ink can produce faded or streaky output, especially for color cartridges.
If you ignore the warning and the cartridge runs completely dry, the printer will stop and display an error message on its screen or in the software. At that point, you'll need to replace the cartridge before printing resumes.
Checking ink levels without software or a display panel
If your printer has no software installed and no display panel, you can visually inspect the cartridges. Open the cartridge access door on your printer (usually on the right side or front) and look at each cartridge. Most HP cartridges have a small window showing the ink level inside — a black line or colored section indicates how full the cartridge is.
This method is less precise than the software reading, but it gives you a rough idea of what's left. If the window shows the ink level below the "low" line marked on the cartridge, you're running low and should order a replacement soon.
Keep in mind that the window shows the ink level at that moment, but the actual usable ink may be slightly less. HP cartridges are designed to stop printing before they're completely empty to protect the print head.
Understanding cartridge type differences in ink readings
HP makes several cartridge types, and they report ink levels differently. Standard cartridges (the most common type) report levels accurately to the software. XL and XXL cartridges (larger capacity) report the same way but hold more ink, so they show lower percentages for longer.
when ready Ink cartridges, which are part of HP's subscription service, report levels to both your printer and your HP account online. If you use when ready Ink, you can also check ink levels on the HP website by logging into your account — the site shows which cartridges are running low and can automatically ship replacements.
If you've refilled a cartridge yourself or bought a refilled one, the sensor may not reset, so the software will show it as empty even though it contains ink. Some refilled cartridges include a reset chip that clears this, but not all do.
Troubleshooting when ink levels won't display
If the software shows "unknown" or "error" for a cartridge's ink level, the most common cause is a dirty sensor. Open the cartridge access door and look at the small metal or plastic contacts on the cartridge and the printer. If they're dusty or have dried ink on them, gently wipe them with a dry, lint-free cloth.
If the cartridge is new and still shows an error after cleaning, it may be a third-party or refilled cartridge that the printer can't read. Try removing and reinserting the cartridge firmly — sometimes a loose connection prevents the sensor from working. If it still doesn't work, the cartridge may straightforward be incompatible with your printer's sensor system.
If all cartridges show errors or the software won't connect to your printer at all, restart both the printer and your computer. Unplug the printer for 30 seconds, plug it back in, and wait for it to fully start up before opening the software again.
Frequently Asked Questions
Can I trust the ink level percentage shown in the software?
The percentage is usually accurate within 5 to 10 percent, but it's an estimate based on how much ink has been used, not a precise measurement. When a cartridge shows 5 percent, you might have enough for a few more pages, or you might be nearly empty — it depends on the type of printing you've been doing. If you need to know exactly, visually inspect the cartridge window.
Why does my printer say the cartridge is empty when it still prints?
HP printers stop reporting ink as available before the cartridge is completely dry to protect the print head from damage. You can usually keep printing for a few more pages after the software shows empty, but the output quality will drop. Once printing stops completely, the cartridge is truly empty.
Does checking ink levels use any ink?
No. Looking at the software, checking the display panel, or visually inspecting the cartridge window uses no ink. The printer only uses ink when you actually print something.
What should I do if my third-party cartridge doesn't show an ink level?
Third-party cartridges often lack the sensor design HP uses, so the printer can't read them. You'll need to visually inspect the cartridge window or keep track of how many pages you've printed since installing it. Some third-party cartridges include documentation with an estimated page yield.
Can I check ink levels on my phone or tablet?
Yes, if you have HP Smart installed on your phone or tablet and your printer is connected to WiFi. Open the app, and it will show the same ink levels as the desktop version. You can check from anywhere in your home as long as both devices are on the same network.