Bandwidth Calculator: Download Time
This bandwidth calculator answers three common questions. How long will a file take to download or upload at a given speed? How much data moves at a speed over a period of time? And how much monthly bandwidth does a website need, based on page views, average page size and a safety margin? It handles bits versus bytes for you (8 bits = 1 byte), and lets you pick decimal (MB, GB) or binary (MiB, GiB) sizes. Results show hours, minutes and seconds plus Mbps and GB per month.
Bandwidth Calculator
Find download time from file size and speed, or the monthly bandwidth a website needs.
How to use the Bandwidth Calculator
- Pick a mode: download time, data used, or website bandwidth.
- Enter the file size or traffic numbers and choose units.
- Enter your connection speed in Mbps or another unit.
- Read the time, data or monthly bandwidth.
Bandwidth formulas
Time = (size in bytes × 8) ÷ speed in bits per second · Data = speed ÷ 8 × time · Website = page views × page size × margin
Features
- Download and upload time
- Data transferred over time
- Website monthly bandwidth
- Bits and bytes handled for you
Frequently asked questions
How long does it take to download 1 GB at 100 Mbps?
About 80 seconds. 1 GB is 8,000 megabits, and 8,000 ÷ 100 = 80 seconds, before any network overhead.
What is the difference between Mbps and MB/s?
Mbps is megabits per second and MB/s is megabytes per second. Divide Mbps by 8 to get MB/s, so 100 Mbps is 12.5 MB/s.
Why is my real download slower?
Protocol overhead, Wi-Fi, server limits and other devices sharing the line usually cut real speeds by 5% to 20%. Add overhead in the calculator to see a realistic time.
How much bandwidth does my website need?
Multiply monthly page views by average page size, then add a safety margin. 50,000 views of 2 MB pages is about 100 GB a month, or 150 GB with a 1.5× margin.
What is a GiB?
A gibibyte is 1,024³ bytes, about 7.4% more than a decimal gigabyte of 1,000³ bytes. Operating systems often show sizes in GiB.