# GB to MB Convert gigabytes to megabytes with decimal vs binary interpretation, alternate-system comparison, and transfer estimates > Canonical page: https://elysiatools.com/en/tools/gb-to-mb - **Category:** Math & Numbers - **Keywords:** data storage, unit conversion, file size, GB, MB ## Overview Convert gigabytes (GB) to megabytes (MB) instantly using either decimal (SI, 1000-based) or binary (1024-based) unit systems, complete with side-by-side system comparisons and network transfer time estimates. ## Inputs - **Value** (text): e.g. 2 - **Unit System** (select) - **Transfer Speed (Mbps, optional)** (number) - **Decimal Precision** (number) ## When to use - When calculating storage capacity differences between hardware manufacturer specifications and operating system displays. - When estimating the download or upload duration of a specific file size in GB over a given network speed in Mbps. - When configuring server resource limits or database allocations that require precise MB inputs. ## How it works - Enter the gigabyte (GB) value you want to convert in the input field. - Select your preferred unit system, choosing between Decimal (1000-based) or Binary-Compatible (1024-based). - Optionally enter a network transfer speed in Mbps and set your desired decimal precision. - Submit the form to generate a structured JSON output containing the converted values and transfer estimates. ## Use cases - Converting cloud storage bucket limits from GB to MB for application configuration files. - Estimating the transfer time of a 50 GB virtual machine image over a 100 Mbps network connection. - Reconciling disk space discrepancies between hardware packaging and operating system reports. ## Frequently asked questions ### What is the difference between decimal and binary GB to MB conversions? Decimal conversions use a base of 1000 (1 GB = 1,000 MB), which is standard for storage manufacturers. Binary conversions use a base of 1024 (1 GB = 1,024 MB), which is standard for operating systems. ### How is the network transfer speed estimate calculated? The tool converts the file size to megabits and divides it by your specified transfer speed in Mbps to estimate the total transfer duration. ### Can I adjust the decimal precision of the conversion output? Yes, you can set the decimal precision option to any value between 0 and 10 to control the rounding of the final result. ### Why does my operating system show less space than the GB listed on my hard drive? Operating systems calculate storage using binary units (1024-based), whereas drive manufacturers use decimal units (1000-based), resulting in a lower reported capacity in the OS. ### Does this tool support other data units like KB or TB? 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