This data storage converter switches a figure between the units used to measure digital information, from a single bit up to a petabyte. Storage and file sizes are quoted in a ladder of units that each step up by a factor of 1024, and it is easy to lose track of how they relate, so this tool does the arithmetic for you. You enter a value, choose the unit it is in and the unit you want, and it returns the result instantly. It uses the binary convention, where one kilobyte is 1024 bytes, one megabyte is 1024 kilobytes, one gigabyte is 1024 megabytes and so on, which is how operating systems report file and drive sizes. It also handles the bit, the smallest unit, where one byte equals 8 bits, a distinction that matters because file sizes are usually in bytes while internet speeds are quoted in bits per second, so an 8 megabit connection downloads at only about 1 megabyte per second. This conversion also explains the common surprise that a drive sold as 1 terabyte shows up as about 931 gigabytes, because the maker counted in 1000s while the computer counts in 1024s. It is handy for sizing downloads, backups, storage and data caps. Enter a value and pick your units to see the converted size straight away.
Uses binary (1024-based) units, as operating systems report. Drive makers often use 1000-based units. Estimate only.
Each unit has a known size in bytes, the base unit here, with each step a factor of 1024 and a bit equal to one eighth of a byte. The converter turns your value into bytes, then into the target unit, so any pair converts in one step.
One gigabyte is 1024 megabytes. A 700 megabyte file is 700 over 1024, which is about 0.68 of a gigabyte.
If you've found a bug, or would like to contact us, or learn more about James Graham and Calculate.co.nz.
Calculate.co.nz is partnered with Interest.co.nz for New Zealand's highest quality calculators and financial analysis.
All calculators and tools are provided for educational and indicative purposes only and do not constitute financial advice.
Calculate.co.nz is proudly part of the Realtor.co.nz group, New Zealand's leading property transaction literacy platform, helping Kiwis understand the home buying and selling process from start to finish. Whether you're a first home buyer navigating your first property purchase, an investor evaluating your next acquisition, or a homeowner planning to sell, Realtor.co.nz provides clear, independent, and trustworthy guidance on every step of the New Zealand property transaction journey.
Calculate.co.nz is also partnered with Health Based Building and Premium Homes to promote informed choices that lead to better long-term outcomes for Kiwi households.
Calculate.co.nz is hosted in Auckland via SiteHost new Zealand.
All content on this website, including calculators, tools, source code, and design, is protected under the Copyright Act 1994 (New Zealand). No part of this site may be reproduced, copied, distributed, stored, or used in any form without prior written permission from the owner.
About & trust: Why Calculate is NZ's most comprehensive · By the Numbers · How we compare · Editorial standards · How we keep data current · NZ finance glossary · Research & data · Financial literacy NZ · About · Privacy policy · Terms of use
Reviewed and maintained. Last reviewed 2026-06-07 and checked on a twice-monthly cycle against IRD, RBNZ and Stats NZ. How we keep data current.
© 2026 Calculate.co.nz. All rights reserved. Building free NZ calculators since 2011.