Use the Storage Unit Converter
Convert between bits, bytes, KB, MB, GB, TB and PB, with both binary (1024-based, KiB/MiB/GiB) and decimal (1000-based) values shown side by side.
- Free to use
- No signup
- Nothing to install
- Runs in your browser
A drive labeled 1TB (decimal: 1,000,000,000,000 bytes) shows as about 931.32 GiB (binary: divide by 1024 three times) in an OS that reports binary gigabytes under the "GB" label — the same physical bytes, two different counting conventions.Open the Storage Unit Converter
Illustration. Open the tool for the real thing.
See it in action
The Storage Unit Converter with sample data entered and the result showing.
What is the Storage Unit Converter?
Enter an amount and a unit, and this tool converts it across bits, bytes, kilobytes, megabytes, gigabytes, terabytes and petabytes — but critically, it shows both the binary interpretation (powers of 1024, technically KiB/MiB/GiB) and the decimal interpretation (powers of 1000, what "KB/MB/GB" technically means in the SI system) side by side, because different tools mean different things by the same label.
This is the real, well-documented reason a drive advertised as "1TB" (1,000,000,000,000 bytes, the decimal meaning manufacturers use) shows up as roughly 931GB in an operating system that reports the binary (1024-based) value under the same "GB" label — nothing is missing, the two systems are just counting differently.
3 steps to your result
Open the tool and follow along. Nothing to install.
What you get
See the 1024-based and 1000-based value for every unit at once, not just one convention.
Bits, bytes, KB/KiB up through PB/PiB.
Understand exactly why advertised and displayed storage sizes differ.
Real exponential math, not rounded approximations.
AZRS tools are free to open and use.
It opens in your browser, so there is nothing to download.
Used for
Pick one to see how it fits.
Anyone confused why their new drive "shows less space"
See the real, precise math behind the discrepancy instead of assuming something's wrong.
Try it freeDevelopers and IT professionals
Convert file, transfer or storage sizes precisely between units for specs, quotes or documentation.
Try it freeStudents learning about data units
Understand the real difference between the binary and SI/decimal meanings of the same prefix.
Try it freeHow it compares
A plain look at this tool next to the usual alternative.
| This utility | Desktop software | |
|---|---|---|
| Install | Nothing to install | Usually an app or program to install |
| Account | No signup | Depends on the product |
| Cost | Free to use | Free or paid, depends on the product |
| Where it runs | In your browser tab | On your computer |
Questions people ask
Why does my new 1TB drive show less than 1TB of space?
Manufacturers use the decimal definition (1TB = 1,000,000,000,000 bytes) while your operating system typically reports the binary definition under the same "GB" label (1024-based), so the same physical bytes show up as a smaller number — about 931 GiB for a decimal 1TB drive.
What's the difference between KB and KiB?
KB (kilobyte) technically means 1000 bytes in the SI/decimal system; KiB (kibibyte) is the unambiguous binary term for 1024 bytes — in casual and even OS usage, "KB" is very often used to actually mean KiB, which is the source of most confusion.
Is RAM measured in binary or decimal?
Binary — RAM capacity is built from powers of 2 due to how memory addressing works, so "16GB of RAM" means the binary value, unlike most advertised drive capacities.
Are network speeds in bits or bytes?
Almost always bits per second (like 100 Mbps), while file sizes are in bytes — dividing a bit-based speed by 8 gives you the byte-based download rate.
Is my data sent anywhere?
No, this is a pure math conversion done locally in your browser.
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Try the Storage Unit Converter now
Convert bytes, bits, KB, MB, GB, TB and PB, showing both binary (1024-based) and decimal. Free to use.
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