# TB to GB Convert terabytes to gigabytes with decimal vs binary interpretation, alternate-system comparison, and transfer estimates > Canonical page: https://elysiatools.com/en/tools/tb-to-gb - **Category:** Math & Numbers - **Keywords:** data storage, unit conversion, file size, TB, GB ## Overview Easily convert Terabytes (TB) to Gigabytes (GB) using either decimal (SI, 1000-based) or binary (1024-based) unit systems. This tool provides instant, precise conversions, compares both calculation methods side-by-side, and estimates data transfer times based on your network speed. ## Inputs - **Value** (text): e.g. 1.25 - **Unit System** (select) - **Transfer Speed (Mbps, optional)** (number) - **Decimal Precision** (number) ## When to use - When comparing storage drive capacities where manufacturers use decimal (1000-based) units but operating systems display binary (1024-based) values. - When planning data migrations and needing to estimate how long a specific number of Terabytes will take to transfer over a given network bandwidth. - When configuring cloud storage quotas, virtual machine disk allocations, or database backups that require precise gigabyte inputs. ## How it works - Input the Terabyte (TB) value you want to convert and select your preferred unit system (Decimal or Binary). - Optionally enter your network transfer speed in Megabits per second (Mbps) and set your desired decimal precision. - The tool calculates the exact Gigabyte (GB) equivalent, generates a side-by-side comparison of both unit systems, and estimates the transfer duration. ## Use cases - Calculating actual usable space when purchasing new 2 TB or 4 TB solid-state drives (SSDs) for server deployments. - Estimating the download or upload time for a 1.5 TB database backup over a 500 Mbps fiber internet connection. - Standardizing storage metrics in technical documentation where precise decimal vs. binary definitions are required. ## Frequently asked questions ### What is the difference between decimal and binary TB to GB conversion? Decimal conversion uses the SI standard where 1 TB equals 1,000 GB. Binary conversion uses base-2 where 1 TB equals 1,024 GB. ### Why does my 1 TB hard drive show up as less space in my operating system? Drive manufacturers define 1 TB as 1,000,000,000,000 bytes (decimal), while operating systems like Windows calculate storage using binary (1,024-based), making 1 TB appear as approximately 931 GB. ### How does the transfer speed estimate work? It divides the total converted data size by your specified bandwidth (in Mbps), accounting for the bits-to-bytes conversion, to estimate the total transfer time. ### Can I control the rounding precision of the conversion? Yes, you can adjust the decimal precision option from 0 up to 10 decimal places to get the exact level of accuracy you need. ### Does this tool support converting GB back to TB? This specific tool is optimized for converting Terabytes (TB) to Gigabytes (GB). 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