Convert GB to TB instantly – no math needed
Type in any number of gigabytes and this converter tells you the exact terabyte value in a fraction of a second. Whether you are checking hard drive capacity, comparing cloud storage plans, or figuring out how much data you transferred – this tool gives you the answer right away.
1 GB = 0.000977 TB (using the standard binary definition), or exactly 0.001 TB if your storage provider uses the decimal (SI) definition. The converter above uses the decimal definition (1 TB = 1,000 GB), which is what most consumer storage manufacturers and cloud providers advertise.
How to use the GB to TB converter
- Enter your gigabyte value in the input box (decimals are fine – for example, 2500.5).
- The terabyte result appears instantly below it.
- Need to go the other way? Flip the conversion to TB to GB using the reverse toggle.
- Copy or note the result – no sign-up, no download required.
Worked example: 500 GB to TB
Say your laptop's SSD is advertised as 500 GB and you want to know how many terabytes that is.
- Start with: 500 GB
- Divide by 1,000 (the number of GB in one TB): 500 ÷ 1,000 = 0.5
- Result: 500 GB = 0.5 TB
Simple check: if your number is less than 1,000 GB, the TB result will always be less than 1. A 2 TB drive holds 2,000 GB.
How the conversion is calculated
The decimal (SI) system – used by hard drive makers and most cloud services – defines:
1 TB = 1,000 GB
TB = GB ÷ 1,000The binary system – used by operating systems like Windows when reporting file sizes – defines:
1 TiB (tebibyte) = 1,024 GiB (gibibytes)
TiB = GiB ÷ 1,024This is why a 1 TB hard drive sometimes shows up as about 931 GB in Windows – the drive is 1,000,000,000,000 bytes, but Windows divides by 1,073,741,824 (1024³) instead of 1,000,000,000,000. This converter uses the decimal definition by default, matching what manufacturers print on the box.
Quick GB to TB reference table
| Gigabytes (GB) | Terabytes (TB) – decimal | What it looks like |
|---|---|---|
| 1 GB | 0.001 TB | A short video clip |
| 2 GB | 0.002 TB | A couple of HD photos |
| 5 GB | 0.005 TB | Free tier on many cloud plans |
| 10 GB | 0.01 TB | Several 4K photos |
| 25 GB | 0.025 TB | A Blu-ray disc |
| 50 GB | 0.05 TB | A dual-layer Blu-ray |
| 100 GB | 0.1 TB | Entry-level SSD |
| 250 GB | 0.25 TB | Laptop SSD (budget) |
| 500 GB | 0.5 TB | Common laptop SSD |
| 1,000 GB | 1 TB | Standard desktop drive |
Reverse conversion formula: GB = TB × 1,000. For example, 2.5 TB = 2,500 GB.
Other ways people ask the same question
People reach for this converter using lots of different phrasings. Here are the most common ones and what they mean:
- "How many GB in a TB?" – You want the scale (1,000 GB decimal / 1,024 GiB binary). Use the table above.
- "Convert gigabytes to terabytes" – Same calculation; just enter your GB number above.
- "1000 GB to TB" – That's exactly 1 TB (decimal). Common question from people comparing hard drive specs.
- "MB to TB" – Divide megabytes by 1,000,000. For example, 500,000 MB = 0.5 TB.
- "GB to TB calculator" – That's this page. Enter your value and the result appears instantly.
- "How many GB is 2 TB?" – Multiply: 2 × 1,000 = 2,000 GB. Or use the reverse toggle above.
Quick tips and common mistakes
- Decimal vs binary confusion: If Windows reports a lower size than the box says, that's the binary vs decimal difference – not a missing gigabyte. Both numbers are correct; they use different definitions.
- Don't confuse GB and Gb: Capital B = bytes, lowercase b = bits. Networking speeds are usually in megabits (Mb) or gigabits (Gb) – 8 bits make 1 byte. Storage is almost always in bytes (GB, TB).
- Cloud storage is decimal: Google Drive, iCloud, Dropbox, and OneDrive all advertise storage in decimal gigabytes and terabytes. This converter matches that.
- Rounding matters: 999 GB is only 0.999 TB – just short of a full terabyte. Don't round up and assume it equals 1 TB when space is tight.
- Data caps: Mobile data plans are always in decimal GB. 50 GB of data is 0.05 TB – a small fraction of what a hard drive holds.
Everything on this page is calculated entirely in your browser. Nothing you type is sent to any server, so your data stays completely private.
Bottom line: dividing gigabytes by 1,000 gives you terabytes. Use the converter above to skip the arithmetic entirely and get your answer in one click.