Data Converter: Convert Digital Storage Units
Digital storage units can be confusing — bytes, kilobytes, megabytes, gigabytes, terabytes, and beyond — especially since hard drive manufacturers and operating systems use different definitions. Our free online Data Converter instantly converts between all common digital storage units, including both decimal (SI) and binary (IEC) definitions. Whether you're comparing hard drive capacities, estimating download times, or managing cloud storage, get accurate data size conversions every time.
Standard Data Conversion Reference
| Unit | Decimal (SI) | Binary (IEC) |
|---|---|---|
| 1 Byte (B) | 8 bits | 8 bits |
| 1 Kilobyte (KB/KiB) | 1,000 bytes | 1,024 bytes |
| 1 Megabyte (MB/MiB) | 1,000 KB (1,000,000 B) | 1,024 KiB (1,048,576 B) |
| 1 Gigabyte (GB/GiB) | 1,000 MB (10⁹ B) | 1,024 MiB (1,073,741,824 B) |
| 1 Terabyte (TB/TiB) | 1,000 GB (10¹² B) | 1,024 GiB (≈1.1 TB) |
| 1 Petabyte (PB/PiB) | 1,000 TB (10¹⁵ B) | 1,024 TiB |
| 1 Exabyte (EB/EiB) | 1,000 PB (10¹⁸ B) | 1,024 PiB |
How to Use the Data Converter
Select your input unit (such as gigabytes), enter the value, and choose the target unit (such as megabytes or terabytes). The converter shows results for both decimal and binary definitions side by side. For example, entering 500 GB (a typical hard drive capacity) shows 500,000 MB in decimal but 476,837 MB in binary — explaining why your 500 GB drive shows only 465 GB in Windows. The converter also supports bits per second (bps) for network speeds, where 100 Mbps equals 12.5 MB/s (megabytes per second) in actual data transfer.
Practical Use Cases for Data Conversion
Hard Drive Shopping: A 1 TB external drive advertised in decimal offers 1,000 GB or roughly 931 GiB when connected to your computer. Understanding this 69 GB difference helps manage expectations and plan storage allocation.
Download Time Estimation: With a 100 Mbps internet connection, your actual download speed is about 12.5 MB/s. A 50 GB game takes about 68 minutes to download at this speed. Use the converter to plan large downloads.
Cloud Storage Plans: A 2 TB cloud storage plan holds approximately 2,000 GB in decimal. If you store 500 GB of photos and videos, you have 1.5 TB remaining — but the service and your OS may report differently due to binary vs decimal counting.
File Size Limits: Email attachments are typically limited to 25 MB. A 10 MB PDF file equals 10,000 KB (decimal) or 10,240 KB (binary). Video files in 4K resolution consume roughly 100 MB per minute — that is 6 GB per hour of footage.
Data Center Planning: Enterprise storage is measured in petabytes. A 1 PB storage array holds 1,000 TB decimal or about 909 TiB binary — a meaningful difference when budgeting for large-scale storage infrastructure.
Tips for Accurate Data Conversion
The difference between decimal (GB) and binary (GiB) becomes significant at larger scales. At the terabyte level, the discrepancy is about 9.95% between TB and TiB. Hard drive manufacturers almost always use decimal units for marketing, while operating systems (Windows, macOS, Linux) may use either — Windows uses binary (GiB) but labels it as GB. For network speeds, always divide Mbps by 8 to get MB/s for actual file transfer rates. Check our Time Converter for download time calculations and our Speed Converter for network speed unit conversions.
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Why Your 1 TB Drive Shows 931 GB
The discrepancy is purely a counting convention. A decimal (SI) gigabyte is 10&sup9; = 1,000,000,000 bytes, which is what hard drive manufacturers use on the box. A binary (IEC) gibibyte is 2³&sup0; = 1,073,741,824 bytes, which is how most operating systems tally capacity internally even when they display the label "GB" on screen.
Run the numbers on a 1 TB drive. As sold, it contains 1,000,000,000,000 bytes. Divide that by 1,073,741,824 to convert to binary units: 1,000,000,000,000 ÷ 1,073,741,824 = 931.3 GiB. That is the "missing" 69 GB buyers often notice after plugging in a new drive. At larger scales the gap compounds: a 2 TB drive reports about 1.86 TiB, and a 1 PB storage array shows about 909 TiB.
The same dual counting applies downward. A 500 GB drive holds 500,000,000,000 bytes, which is 476,837 MiB — and this is exactly what the converter displays when you select both definitions side by side. When comparing capacities, always ask which definition the number uses: SI for storage marketing and network speeds, IEC for filesystem and operating-system reporting.
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Use our Data Converter Guide together with related tools such as Currency Converter, Area Converter, Data Converter to plan more accurately. Each calculator runs instantly in your browser with step-by-step guidance.
Written by the CalcMaster Pro Editorial Team — financial, health, and DIY tools reviewed for accuracy. All calculators run on standard, widely accepted formulas. Always confirm final numbers with a qualified professional for decisions that require official figures.