Technology and Computing
Binary, decimal and hexadecimal, download time, bitrate, resolution, DPI and PPI, frequency and electrical power.
Technology arithmetic goes wrong by unit: a bit is not a byte, Mbps is not MB/s and 4K is not twice 1080p in pixels. These calculators convert number bases, estimate transfer time from the real connection rate and keep resolution, density (DPI and PPI) and physical screen size apart. Download time is an ideal-network estimate, with no protocol overhead and no other devices competing.
How to use these calculators
- 1Choose the source and target base to convert whole numbers between binary, decimal and hexadecimal.
- 2For downloads, enter the file size and the speed in Mbps; the result applies the divide-by-8 between bit and byte.
- 3For a screen, enter diagonal and resolution to get DPI and PPI, which measure different things.
Applications in this category
Each application groups related functions on one page, with a guide for each one.
Calculators in this field
1 calculatorsFrequently asked questions
Why does 100 Mbps not download 100 MB per second?
Because Mbps is megabits per second and MB is megabytes. Dividing by 8, 100 Mbps is 12.5 MB/s at best.
Are DPI and PPI the same measure?
No. PPI is the pixel density of a screen; DPI is the dot density of printing. Confusing them changes the printed size of a photo.