[{"data":1,"prerenderedAt":28},["ShallowReactive",2],{"page-content:en:guides\u002Fmegabits-vs-megabytes":3},{"home":4,"toolExplainer":4,"guide":5,"guideTitles":27,"legal":4},null,{"title":6,"description":7,"h1":8,"answer":9,"sections":10,"faqs":20},"Megabits vs Megabytes — SpeedTestLab","A megabit is 1,000,000 bits. A megabyte is 8 times larger in common SI use. Mbps is not MB\u002Fs.","Megabits vs Megabytes","ISPs advertise megabits per second (Mbps). File sizes are often megabytes (MB). Divide Mbps by 8 for an approximate MB\u002Fs, then expect less in real transfers because of protocol overhead.",[11,14,17],{"h":12,"p":13},"The factor of eight","1 byte = 8 bits, so 80 Mbps is theoretically 10 MB\u002Fs before overhead.",{"h":15,"p":16},"Decimal prefixes","SpeedTestLab uses SI decimal prefixes: 1 Mbps = 1,000,000 bits\u002Fs. Some operating systems still show MiB (1024-based) for files.",{"h":18,"p":19},"Worked example","A 1 GB file (1,000,000,000 bytes) at 100 Mbps has a theoretical time of 80 seconds. The calculator on this site uses that formula.",[21,24],{"q":22,"a":23},"Why is my download in MB\u002Fs smaller?","The browser or OS may show bytes. Also TCP, HTTP, and Wi‑Fi overhead consume part of the bit rate.",{"q":25,"a":26},"Is Gbps the same as GB\u002Fs?","No. 1 Gbps is about 125 MB\u002Fs theoretical.",[],1793775154431]