Data Storage Converter: Tips & How-Tos

Best Practices

Hard drive makers use SI (1 KB = 1,000 bytes). Manufacturers advertise storage in decimal units, so a '1 TB' drive contains 1,000,000,000,000 bytes. Your operating system may display a slightly smaller figure because it uses binary units internally.
Windows traditionally reports sizes in binary units with SI labels. Windows labels a binary gibibyte (1,073,741,824 bytes) as 'GB', causing confusion. A 500 GB drive may show as only 465 GB in Windows Explorer for this reason.
macOS switched to SI units in OS X 10.6 (Snow Leopard). Since 2009, macOS reports file sizes in SI decimal units, matching the labels on drives and flash storage. A 500 GB drive shows as approximately 500 GB in Finder.
Streaming and download speeds use SI bits per second. Internet speeds are measured in megabits per second (Mbps) using SI prefixes. 1 Mbps = 1,000,000 bits per second — not 1,048,576. This is consistent across the industry.
Use IEC units (KiB, MiB, GiB) to eliminate ambiguity. The international standard uses kibibyte (KiB = 1024 B), mebibyte (MiB = 1024 KiB), and gibibyte (GiB = 1024 MiB) for binary units. If precision matters, use these names.

Plan storage with a headroom margin of at least 20%. A full drive is a slow drive — operating systems and SSDs need free space for optimal performance. Budget to keep at least 15–20% of capacity free at all times.
Video is by far the largest consumer of storage. 4K video at high bitrate can consume 50–100 GB per hour. Budget storage accordingly if you record, edit, or store video. Compressed streaming versions are far smaller than original footage.
RAW photos are typically 3–5× larger than JPEGs. A JPEG might be 5–8 MB; the equivalent RAW file from the same camera is typically 20–30 MB. Plan your memory card and archive storage around RAW size if you shoot in RAW format.
Compressed files can be 50–90% smaller than uncompressed. A ZIP or 7z archive of text files may reduce size by 70–80%. Images (JPEG, PNG) are already compressed and gain little from further archiving. Video in H.264/H.265 is already highly compressed.
Check available space before large downloads or backups. A partial download or failed backup due to insufficient space can corrupt the destination file system. Verify free space before starting any operation larger than a few hundred megabytes.

Divide Mbps by 8 to get MB/s transfer speed. Internet speeds are quoted in megabits per second; file sizes are in megabytes. Since 1 byte = 8 bits, a 100 Mbps connection transfers approximately 12.5 MB per second.
Advertised broadband speed is the download peak, not a sustained average. Your actual download speed is typically 70–90% of the advertised figure, and upload speed is often much slower. Use a speed test for realistic numbers before planning large transfers.
USB speeds vary dramatically by version. USB 2.0: ~60 MB/s theoretical (often 25–30 MB/s real). USB 3.0: ~625 MB/s theoretical. USB 3.2 Gen 2×2: ~2,500 MB/s. Always check which USB version your device and cable support.

Estimating the capacity of a memory card for a given shooting format.

Find your camera's approximate file size per photo (check the manual or camera menu — e.g. 25 MB for RAW, 6 MB for JPEG).
Enter the memory card capacity in the Data Storage Converter (e.g. 128 GB = 128,000 MB).
Divide the card capacity by the per-photo file size: 128,000 ÷ 25 = 5,120 RAW photos.
For mixed RAW + JPEG shooting, account for both file sizes and add them together per shot.

Understanding how quickly a file will download given your broadband speed.

Note your internet speed in Mbps (from your ISP or a speed test).
Divide by 8 to convert megabits to megabytes: 100 Mbps ÷ 8 = 12.5 MB/s.
Divide the file size (in MB) by 12.5 to estimate the download time in seconds.
Example: a 5 GB (5,000 MB) file at 12.5 MB/s takes approximately 400 seconds (about 7 minutes).

Planning a cloud backup, video upload, or large file transfer.

Check your upload speed (ISP plans often specify this separately from download speed).
Divide by 8 to convert Mbps to MB/s.
Divide the file size in MB by your upload MB/s to get seconds.
Convert to minutes or hours as needed: a 10 GB file at 5 Mbps upload = 10,000 MB ÷ 0.625 MB/s ≈ 16,000 seconds ≈ 4.4 hours.

Understanding why a '2 TB' drive appears smaller in Windows than expected.

The drive manufacturer uses SI: 2 TB = 2,000,000,000,000 bytes.
Windows reports in binary GiB but labels them GB: 2,000,000,000,000 ÷ 1,073,741,824 ≈ 1,863 GiB, displayed as '1.86 TB'.
Use the Data Storage Converter: enter 2,000 GB (SI) and convert — the result confirms the binary equivalent.
This discrepancy is normal; no storage is missing from the drive.

Estimating monthly data usage from streaming habits.

Find the stream's bitrate: standard HD (1080p) is typically 3–8 Mbps; 4K can be 15–25 Mbps.
Convert Mbps to MB/s by dividing by 8 (e.g. 5 Mbps = 0.625 MB/s).
Multiply by 3,600 (seconds per hour): 0.625 × 3,600 = 2,250 MB = approximately 2.25 GB per hour at 5 Mbps.
Multiply by your monthly streaming hours to estimate total monthly data usage.

Choosing a cloud storage tier that provides enough capacity for current and future needs.

Audit current storage usage across all devices and shared drives.
Estimate annual growth rate (typically 20–30% per year for active businesses).
Calculate needed capacity for 3 years: current usage × (1.25)³ (assuming 25% annual growth).
Add a 30% buffer for unexpected growth and use the Data Storage Converter to express the total in whichever unit the cloud provider uses (usually GB or TB).
Compare plans at the required tier across providers.