How many MB are in GB ? Online MB to GB conversion using binary and decimal systems. Convert megabytes ( MB ) to gigabytes ( GB ) using decimal or binary units. Learn the difference, definition and examples of MB and GB , and see the conversion table and calculator. Use our MB to GB conversion calculator to quickly and accurately convert data storage capacity between megabytes and gigabytes . Using a MB to GB converter aids in understanding how much space your uploads will require on the platform or device. If, for instance, your photo albums total 2500 MB , knowing this translates to 2.5 GB makes it easier to manage your posts. This insight can prompt you to optimize images before uploading, keeping your social feed sleek and organized.