Technology calculators
Download times, file sizes, screens, networks and passwords, worked out for the devices you use.
11 calculators · every one shows its working
- Download Time CalculatorHow long a file takes to download at your internet speed, with Mbps and MB/s explained.
- IP Subnet CalculatorNetwork address, subnet mask, broadcast address and usable host range for any IPv4 address and prefix.
- Password Strength CalculatorHow strong a random password or passphrase is in bits, and how long it would take to guess.
- TV Size and Viewing Distance CalculatorA screen's width and height from its size in inches, and how far away to sit.
- PX to REM ConverterConvert pixels, rem and points for web design, with any root font size.
- Aspect Ratio CalculatorSimplify a screen or image size to its aspect ratio, and resize it without stretching.
- Video File Size CalculatorHow big a video file will be from its bitrate and length, in MB and GB.
- Colour Converter (HEX, RGB, HSL)Convert colours between hex, RGB, HSL and CMYK, and see whether white or black text reads best on them.
- Battery Life CalculatorHow long a battery lasts from its mAh and the device's current draw, and how many charges a power bank gives.
- Screen PPI CalculatorPixel density of a phone, monitor or TV from its resolution and size, with its width, height and dot pitch.
- Mobile Data Usage CalculatorHow many GB of mobile data you use a month from your video, social media, music and calls.