Tech & Digital calculators
Digital units trip people up because one word can mean two sizes: a gigabyte is a thousand megabytes on a drive's box and 1,024 in some operating systems. These calculators state which convention they use and convert between the two where it matters.
The tools here cover screens, storage, networks, and security, and each one shows the formula behind the number so you can check it against a spec sheet.
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- Aspect Ratio CalculatorReduce any width and height to its simplest aspect ratio, or find the missing width or height that keeps a ratio such as 16:9.
- Color Code ConverterChange a color between HEX, RGB and HSL, see a rough CMYK ink mix, and check how readable white or black text is on it.
- Data Storage ConverterConvert digital storage between bits, bytes, decimal units like MB and GB, and binary units like MiB and GiB.
- Download Time CalculatorSee how long a download or upload takes, the speed you need to meet a deadline, or how much data moves in a set time.
- IP Subnet CalculatorSee which network an IPv4 address belongs to, with its broadcast address, usable address range, masks and binary form, from a CIDR prefix or subnet mask.
- KB to MB ConverterConvert kilobytes to megabytes or megabytes to kilobytes using decimal SI prefixes, with the KiB and MiB binary units explained.
- MB to GB ConverterConvert megabytes to gigabytes or gigabytes to megabytes using decimal prefixes, with the binary MiB and GiB difference explained.
- Password Entropy CalculatorSee how strong a random password or passphrase is, in bits of entropy, from its length and character sets. It also estimates how long it would take to guess.
- PPI CalculatorSee how sharp a screen is (its pixels per inch), plus its real width, height and pixel size, from its resolution and diagonal.
- TV Size and Viewing Distance CalculatorGet a guideline viewing distance range for a screen size, or the screen size that suits a seating distance, from field-of-view and resolution rules.
- Unix Timestamp ConverterTurn a Unix timestamp in seconds or milliseconds into a readable UTC date and time, or a date back into a timestamp, with an optional local time zone.
- Uptime and Downtime CalculatorTurn an uptime percentage such as 99.9% into the downtime it allows per day, week, month, quarter and year, or turn a downtime figure back into an uptime percentage.
- Video File Size CalculatorSee how big a video file will be from its bitrate and length, or find the bitrate that squeezes it under a size limit.