How to Find the Serial Number of Your Laptop

Every laptop has a unique serial number — a string of letters and numbers assigned by the manufacturer that identifies your specific device. Knowing where to find it matters more than most people realize until the moment they actually need it: filing a warranty claim, reporting a theft, getting technical support, or checking whether your laptop is eligible for a recall or software update.

The good news is there are several reliable ways to locate it. The method that works best depends on your operating system, your laptop's brand, and whether the physical label is still legible.

Why Your Laptop Serial Number Matters

Before diving into the how, it's worth understanding what a serial number actually does. Unlike a model number — which identifies a product line and is shared by thousands of identical units — a serial number is unique to your individual device. Manufacturers use it to track production dates, warranty status, repair history, and part configurations.

When you contact support for HP, Dell, Lenovo, Apple, or any other brand, the serial number is usually the first thing they ask for. It pulls up your exact device in their system, including what components it shipped with and whether your warranty is still active.

Method 1: Check the Physical Label on the Laptop 🔍

The most straightforward place to look is the laptop itself. Most manufacturers print the serial number directly on the device, though the location varies:

• Bottom of the laptop — the most common location. Look for a sticker or engraved text near the battery compartment or ventilation area.
• Under the removable battery — on older models with detachable batteries, the serial number is often printed on the chassis underneath.
• Inside the battery compartment — even if the battery isn't removable, some models print it on a label visible through a small slot.
• On the original packaging or box — if you still have it, the serial number is usually on a barcode sticker on the outside.

The label typically shows both the model number and serial number side by side, so check which line is labeled "S/N" or "Serial No."

Wear, heat, and age can fade these stickers over time, which is why knowing the software-based methods is useful as a backup.

Method 2: Find the Serial Number in Windows

If you're running Windows, you can pull the serial number without touching the physical device — useful when the sticker is worn or the laptop is mounted in a hard-to-reach spot.

Using Command Prompt or PowerShell:

1. Press Windows + R, type cmd, and press Enter
2. Type the following and press Enter:

wmic bios get serialnumber 

3. The serial number will appear on the next line

This command queries the BIOS/UEFI firmware, where the manufacturer stores the serial number at the hardware level. It's generally accurate regardless of any OS reinstalls or software changes.

Using System Information:

1. Press Windows + R, type msinfo32, and press Enter
2. In the System Summary panel, look for System Serial Number

Note: On some laptops — particularly budget models or white-label devices — this field may display "To Be Filled By O.E.M." If that happens, the physical label or BIOS screen is your best fallback.

Method 3: Find the Serial Number on a Mac 🍎

Apple makes this relatively straightforward:

From the Apple Menu:

1. Click the Apple logo in the top-left corner
2. Select About This Mac
3. The serial number is listed directly in the overview panel

Using Terminal:

1. Open Terminal (found in Applications → Utilities)
2. Type the following and press Enter:

system_profiler SPHardwareDataType | grep Serial 

On MacBooks, the serial number is also engraved on the bottom case near the regulatory text — small but readable.

Method 4: Check the BIOS/UEFI Screen

If your laptop won't boot or you're troubleshooting at the firmware level, the serial number is often visible in the BIOS/UEFI settings screen:

1. Restart the laptop and press the firmware key during startup (commonly F2, F10, Del, or Esc — varies by manufacturer)
2. Navigate to the System Information or Main tab
3. Look for Serial Number or Product Serial

This method works regardless of whether Windows is installed or functional, making it particularly useful for recovery situations.

Method 5: Check via Manufacturer Utility Software

Many laptop brands ship their own system management tools that display hardware information prominently:

These apps are typically pre-installed and accessible from the Start Menu. They usually display the serial number on the home or device info screen — and often link directly to warranty lookup tools.

When the Serial Number Is Unavailable or Unreadable

There are cases where none of the above methods return a clear result:

• Refurbished or remanufactured laptops sometimes have replaced chassis parts with missing or non-original labels
• BIOS updates or replacements can occasionally wipe or reset stored serial data
• Third-party or white-label devices may not have a serial number encoded in firmware at all

In these situations, the original purchase receipt or invoice often includes the serial number as it was recorded at the point of sale. Retail packaging barcodes can also be scanned or cross-referenced with the retailer's records.

The Variables That Shape Your Situation

Finding a serial number sounds like a simple task — and usually it is — but several factors determine which method actually works for you:

• Operating system and version affect which commands and system tools are available
• Laptop age and condition determine whether the physical label is still legible
• Manufacturer dictates where labels are placed and what firmware fields are populated
• Device history — whether it's been repaired, refurbished, or had its BIOS reset — can affect what's stored at the firmware level

A newer consumer laptop from a major brand will almost always have the serial number accessible through multiple redundant methods. An older, heavily used, or third-party device may require more digging — and some approaches may come up empty where others succeed.