Data storage converter: convert bytes, KB, MB, GB, TB instantly

Need to convert between bytes, kilobytes, megabytes, gigabytes, or terabytes? ToolHQ's Data Storage Converter converts any digital storage unit to any other instantly, with both binary (base-2) and decimal (base-10) results. Free, no account required.

ToolHQ's Data Storage Converter is a free online tool that converts digital storage measurements between bytes, kilobytes, megabytes, gigabytes, terabytes, petabytes, and beyond, showing both binary (IEC) and decimal (SI) values so you know exactly which standard applies to your context.

Data storage units seem simple until you realize that a gigabyte means different things depending on whether you're reading a hard drive spec, an operating system file size display, or a data transfer bill. The distinction between decimal gigabytes (the 1,000-based definition used in marketing) and binary gibibytes (the 1,024-based definition used by operating systems) explains why a 500 GB hard drive shows as 465 GB in Windows. This tool shows both, clearly labeled.

Key Takeaways

• Converts between bytes, KB, MB, GB, TB, PB instantly
• Shows both binary (1,024-based) and decimal (1,000-based) values
• Explains the difference between GB and GiB
• All calculations run locally: no data is stored or transmitted
• Free with no account required

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Binary vs. decimal: why storage units are confusing

The root of the confusion is that "kilobyte" and "megabyte" have two different legitimate definitions.

Decimal (SI) definition: Used by hard drive manufacturers, storage providers, and network bandwidth providers.

• 1 KB = 1,000 bytes
• 1 MB = 1,000,000 bytes (1,000 KB)
• 1 GB = 1,000,000,000 bytes (1,000 MB)
• 1 TB = 1,000,000,000,000 bytes (1,000 GB)

Binary (IEC) definition: Used by operating systems (Windows, macOS, Linux) when reporting file sizes and available storage.

• 1 KiB (kibibyte) = 1,024 bytes
• 1 MiB (mebibyte) = 1,048,576 bytes (1,024 KiB)
• 1 GiB (gibibyte) = 1,073,741,824 bytes (1,024 MiB)
• 1 TiB (tebibyte) = 1,099,511,627,776 bytes (1,024 GiB)

According to Wikipedia's overview of binary prefixes, the International Electrotechnical Commission (IEC) standardized the "bi" prefixes (kibibyte, mebibyte, gibibyte) in 1998 specifically to resolve this ambiguity, but common usage still uses "gigabyte" to mean either definition depending on context.

In practice: when you buy a 1 TB hard drive, the manufacturer uses decimal TB (1 trillion bytes). Your operating system displays available space in binary-based units (displaying as approximately 931 GiB, which Windows calls "GB"). This 7% gap is not missing storage; it's a measurement difference.

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When you need a data storage converter

Storage unit conversions come up in practical situations more often than you'd expect.

Understanding hard drive capacity: You bought a 2 TB drive, but Windows says 1.81 TB is available. The converter shows you exactly why: 2,000,000,000,000 bytes equals 1.82 TiB in binary.

Cloud storage calculations: Cloud providers often use decimal GB in pricing. You need to estimate how many photos (average 4 MB each) fit in a 100 GB storage plan.

Network speed to file size: Your internet connection is 100 Mbps (megabits per second). How long to download a 4 GB file? The converter helps bridge between bits and bytes (8 bits = 1 byte) and decimal vs binary units.

Database and server sizing: Database administrators and system architects calculate storage requirements for planned data volumes, converting row-count × average-row-size estimates into total storage needs.

Mobile data plans: Your mobile data plan is 15 GB. A streaming service uses 2 GB per hour at high quality. How many hours can you stream?

File size limits: A service accepts uploads up to 25 MB. Your file is 31,000 KB. Will it fit?

Mini-story: In March 2026, Isabel, a photographer in Mexico City, was setting up a cloud backup plan for her client photo library. Her library was 3.8 TB of raw files. The cloud provider offered plans in decimal GB: a 4 TB plan at $20/month and a 5 TB plan at $25/month. She needed to know whether 4 TB of cloud storage (4,000,000,000,000 bytes in decimal) would actually hold 3.8 TB of files as her backup software reported the size. She used ToolHQ's Data Storage Converter to verify: 3.8 TiB (as reported by her OS) equals approximately 4.18 TB in decimal terms. The 4 TB plan would not be sufficient; she subscribed to the 5 TB plan. Fifteen minutes of clarity saved her a failed backup and a mid-month plan upgrade.

Convert data storage units now, free, no account needed

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How to use ToolHQ's data storage converter: step by step

Conversion takes seconds.

1. Open the tool. Go to https://www.toolhq.app/tools/data-storage-converter. No login required.
2. Enter your value. Type the number you want to convert.
3. Select the input unit. Choose from bytes, bits, KB, KiB, MB, MiB, GB, GiB, TB, TiB, PB, PiB.
4. View all conversions. The tool displays the equivalent in every other unit simultaneously, showing both decimal (SI) and binary (IEC) values.
5. Read the result. Find the output unit you need from the list.

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Data storage reference table

Common storage sizes for practical reference:

Item	Approximate size
Plain text email	5-10 KB
Average web page	2-4 MB
JPEG photo (smartphone)	2-6 MB
RAW photo (DSLR)	20-50 MB
MP3 audio (4 min song)	4-8 MB
HD video (1 min, 1080p)	150-250 MB
4K video (1 min)	400-750 MB
Average feature film (streaming)	2-8 GB
Modern video game	20-100 GB
OS + software installation	20-60 GB

Mini-story: David, a developer at a fintech startup in Singapore, was estimating database storage costs for a transaction audit log in November 2025. Each log entry was approximately 2 KB. The product expected 50,000 transactions per day. He calculated: 50,000 × 2 KB = 100,000 KB = 100 MB per day. He ran the conversion through ToolHQ's Data Storage Converter to verify his mental math and see monthly and annual totals: 100 MB/day × 365 = 36,500 MB = 35.65 GiB per year. At a typical managed database price of $0.12/GiB/month, that was under $51 per year for audit log storage. The calculation took two minutes and gave him a confident number to present in the infrastructure planning meeting.

For related converter tools, the Unit Converter handles physical measurements, and the Speed Converter is useful for network speed conversions. All converter tools are in ToolHQ's converter category.

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Frequently asked questions

Why does my hard drive show less storage than advertised?

Hard drive manufacturers use decimal (1 GB = 1,000,000,000 bytes). Your OS displays storage in binary units (1 GiB = 1,073,741,824 bytes). A 1 TB drive (decimal) equals about 931 GiB, which Windows labels as "GB." No storage is missing; the units differ.

What is the difference between a bit and a byte?

8 bits = 1 byte. Network speeds are typically measured in bits per second (Mbps, Gbps). File sizes are measured in bytes (MB, GB). To convert: a 100 Mbps connection downloads 100/8 = 12.5 MB per second.

Are the calculations stored or transmitted?

No. All conversions are pure math performed locally. No data is stored or transmitted.

What is the largest unit supported?

The tool supports up to petabytes (PB, decimal) and pebibytes (PiB, binary). For reference, 1 petabyte equals 1,000 terabytes; a pebibyte equals 1,024 tebibytes.

When should I use binary vs. decimal units?

Use decimal (GB, TB) when comparing to hard drive marketing specs or cloud storage pricing. Use binary (GiB, TiB) when reading OS-reported file or disk sizes. When in doubt, the converter shows both.

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Conclusion: the short version

Data storage units seem simple but have two competing standards (decimal and binary) that cause consistent confusion. ToolHQ's Data Storage Converter converts any storage unit to any other instantly, showing both decimal and binary values so you always know which standard applies. No data is stored or transmitted, calculations run locally. Free, no account needed.

Know exactly how much storage you have, need, and are paying for.

Convert data storage units now, free, instant, no account needed

For related tools, use the Unit Converter for physical measurements and Speed Converter for network speeds. See all converter tools in ToolHQ's converter section.

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