File Size, Storage & Transfer Calculators
Convert between KB, MB, GB and TB, estimate how long a download or backup will take, size a video before you export it, and work out how many photos, songs or hours of footage a drive really holds. Every calculator runs locally in your browser, shows its formula, and handles the awkward part honestly: 1024 versus 1000.
Data unit converters
10 calculatorsGB to MB Converter
Convert gigabytes to megabytes with the 1024 and 1000 rules both shown
MB to GB Converter
Turn megabytes into gigabytes with both 1024 and 1000 conventions
KB to MB Converter
Kilobytes to megabytes, plus the KiB/MiB variant and quick reference table
MB to KB Converter
Megabytes to kilobytes, both conventions, with print and web size references
TB to GB Converter
Terabytes to gigabytes, including the 931 GiB reality of 1 TB drives
GB to TB Converter
Gigabytes to terabytes for drive and cloud planning
Bytes to MB Converter
Exact byte counts to readable megabytes, the unit developers and specs use
Bits to Bytes Converter
The conversion behind every internet speed claim
Mbps to MB/s Converter
Network speed to download speed — the 8× divide everyone needs
How Many MB in a GB
The straight answer, both conventions, and why your storage disagrees
Download & transfer time
4 calculatorsDownload Time Calculator
How long a download takes at your real connection speed
Upload Time Calculator
Upload estimates for video, backups and cloud sync on asymmetric plans
Data Transfer Calculator
Copy times between drives, cards, SSDs and network shares
Streaming Data Usage Calculator
How much data streaming uses per hour at each quality level
File size calculators
4 calculatorsVideo File Size Calculator
Estimate video size from resolution, bitrate and duration
Video Bitrate Calculator
Work out the bitrate you need for a target file size
Audio File Size Calculator
Size of MP3, AAC, FLAC and WAV files from bitrate and length
Screen Recording Size Calculator
Disk space for OBS and screen recordings before you hit record
Storage capacity
7 calculatorsStorage Capacity Calculator
How many photos, songs, videos or documents fit on any drive
Memory Card Calculator
Photos and video per SD card size for cameras and drones
How Many Photos Can 1TB Hold
The direct answer by camera type, plus the calculator to change sizes
Dashcam Storage Calculator
How many hours or days a dashcam card holds before looping
Security Camera Storage Calculator
NVR and CCTV storage for N cameras at a chosen retention window
Hard Drive Capacity Calculator
Why a 1 TB drive shows 931 GB — exact usable capacity math
Cloud Storage Planner
How much cloud storage your photos, videos and backups need
Guides
Why a 1 TB Drive Shows 931 GB
The decimal-versus-binary answer in plain language
MB vs MiB: Binary and Decimal Units
What the IEC names mean and when each one applies
Mbps vs MB/s: The 8× Trap
Why your downloads look slower than your plan promises
How Many GB in a TB
1,000 or 1,024 — and what that means for real drives
How Much Storage Do I Need?
Sizing phones, laptops, drives and cloud tiers by use case
What Is Video Bitrate?
Bitrate, quality and file size without the hand-waving
What Internet Speed Do I Need?
Speeds for streaming, calls, gaming and large downloads
What these calculators do — and where the limits are
Solid ground
- Unit arithmetic is exact: 1 GB is 1,000 MB decimal or 1,024 MB binary, and both results are shown.
- Transfer times use the real formula — bits divided by bits per second — with a 90% efficiency row for planning.
- File sizes are bitrate × time ÷ 8, the same maths encoders use, with codec factors stated on the page.
- Capacity counts are whole files and include a conservative row that subtracts file-system overhead.
Where estimates meet reality
- No connection runs at its headline rate: expect 90–95% on Ethernet and 50–80% over Wi-Fi.
- Bitrate is an average — a static interview and a fireworks display at the same setting differ by 5×.
- Cameras, phones and file systems add sidecar files and metadata that shave a few percent off every count.
- We do not measure your hardware or your line speed. These pages do arithmetic on the numbers you enter, transparently.