GB, MB, GiB, TiB: never get tricked by storage sizes again.
Your hard drive "lost" space the day you bought it — or so it seems. Storage makers count in decimal (1 GB = 10⁹ bytes), operating systems count in binary (1 GiB = 2³⁰ bytes), and the gap widens with every step up the ladder: a "1 TB" drive shows about 0.91 TiB, the famous missing 9%.
The converters below handle both conventions side by side, with plain-language explanations of what each size means in real files — photos, songs, videos — so you buy the storage you actually need.
These converters settle the decimal-versus-binary confusion once and for all. Enter any size in KB, MB, GB or TB and see both conventions side by side, plus what the number means in real files — how many photos, songs or minutes of video. The result: you buy the storage you need and understand the space your drive really shows.
Are these converters really free? Yes — unlimited, no account, no paywall. CalculUnits is funded by non-intrusive ads only.
How accurate are the results? Every conversion uses the exact official factor from SI and NIST references, shown on each page so you can verify the math yourself.
Do my values leave my device? No — all calculations run in your browser. Nothing you type is ever sent anywhere.