Developer & Tech Calculators

Estimate LLM API cost from token counts and your provider’s price per million tokens.

Scale a width or height to a given aspect ratio and see the resulting dimensions and megapixels.

Convert a value between binary, octal, decimal, and hexadecimal in one step.

Check any text and background colour pair against WCAG AA and AAA contrast thresholds.

Turn a min and max font size across two viewport widths into a fluid clamp() slope and intercept.

Estimate how long a file takes to download from its size and your connection speed.

Convert a hex colour to RGB and HSL with a live preview.

Work out the network address, broadcast, usable host range, mask, and wildcard from an IPv4 address and prefix.

Estimate password entropy in bits and how long an offline attacker would need to crack it.

Calculate display PPI, dot pitch, and megapixels from resolution and diagonal size.

Convert rem to pixels and pixels to rem at any root font size, with the root percentage shown.

Percent-encode text for a URL query or decode an encoded URL back into readable text.

Estimate video file size from duration, video bitrate, and audio bitrate in MB, GB, and GiB.