Utility Tools

Some calculations come up in everyday life rather than in a classroom or an office. This collection of 54 free utility tools covers dates, time, units, school, home improvement, motoring, and a bit of fun — all fast, private, and free, running entirely in your browser with nothing to install and nothing stored. Each one gives an instant answer with a short explanation of how it works.

Time and date questions are the most common. The Age Calculator gives your exact age down to the second, the Date Calculator adds or subtracts days, weeks, months, or years from any starting point, and the Time Zone Calculator converts times between cities around the world. For measurement conversions, the Unit Converter handles length, weight, temperature, area, volume, speed, pressure, and energy in a single place.

Students can track academic standing with the GPA Calculator and the Grade Calculator, which also shows the score you need on a final exam to reach a target grade. Homeowners and DIYers will find material estimators for concrete, gravel, mulch, tile, roofing, and stairs, plus BTU and square footage calculators for sizing heating, cooling, and renovation projects.

There are plenty of practical extras too: a password generator with an entropy meter, fuel cost and gas mileage tools, a time card calculator for weekly work hours, IP subnet and voltage drop calculators for technical jobs, a resistor color code decoder, and lighthearted tools like the love calculator and dice roller. Whatever the odd question, there is probably a tool below for it.