The Calculator King
Free calculators and unit converters for everyday use
About The Calculator King
The Calculator King is a free website of calculators and measurement converters aimed at anyone who needs quick, easy conversions or calculations. Its converter library is broad, covering angle, area, energy, frequency, length, power, speed, temperature, time, volume and weight, along with number system conversions such as binary, hexadecimal and octal.
Beyond unit conversion, the site offers reference lookup tables for ASCII codes, Windows Alt codes, shoe size charts and math symbols. A cooking and baking converter is also listed for kitchen measurements.
The site is organized as a browsable index with a search box and an on-page table of contents, so visitors can jump straight to the category they need. Its focus is simplicity and free access rather than accounts or integrations.
Related tools
The Calculator King alternatives
Mom Clock
Strict alarms and app blocking to enforce focus and routines
SplitSleeperCalc
Check if two rest periods qualify as an FMCSA sleeper split
Cyanote
Notes, tasks and clipboard manager for Mac and Windows
Forty PDF
Arrange, redact and export PDFs before sharing them
GearDex
Gear inventory, loans and shoot planning for photographers
JustTools
142 free browser-based tools for images, PDFs, text and more