Tech / IT calculators
Tools for tech and IT: base converter (binary, hex), download time, subnet, password strength and aspect ratio. TudoCalc's tech calculators cover what developers and IT students need.
Download time
Calculate how long a file takes to download at your internet speed.
Subnet (IPv4/CIDR)
Compute network address, broadcast, mask and host count from an IP and CIDR prefix.
Password strength
Estimate password entropy (bits) and crack time from length and character types.
HEX ↔ RGB color
Convert colors between HEX (#RRGGBB) and RGB formats.
Aspect ratio
Find the aspect ratio (e.g. 16:9) of an image or screen and resize keeping the proportion.
Number base converter
Convert numbers between binary, octal, decimal and hexadecimal. Enter the value and its base.
Password generator
Create strong, random passwords with the length and character types you choose. Generated in your browser — nothing is sent.
Pixel density (PPI)
Calculate a screen's pixels per inch (PPI) from its resolution and diagonal size.
Uptime / SLA
Find out how much downtime an uptime SLA allows per year, month, week and day.
Color contrast (WCAG)
Calculate the contrast ratio between two colors and see if it passes WCAG accessibility criteria.