Online Calculators
Use these free online calculators for everyday tasks such as age, dates, time, work hours, GPA, grades, concrete, subnetting, passwords, and unit conversions.
Select a tool below to get instant results without sign-up. These calculators are built for quick planning, checking, estimating, and converting.
Age Calculator
Calculate your exact age in years, months, weeks, days, and hours — and find your next birthday.
Open Calculator →Date Calculator
Find the number of days between two dates, or add/subtract days from any date.
Open Calculator →Time Calculator
Add, subtract, or convert time — hours, minutes, seconds, days, and weeks.
Open Calculator →Hours Calculator
Calculate total hours worked across multiple shifts and estimate your gross pay.
Open Calculator →GPA Calculator
Calculate your semester GPA and cumulative GPA based on your courses, grades, and credit hours.
Open Calculator →Grade Calculator
Calculate your weighted average grade or find out what score you need on a final exam.
Open Calculator →Concrete Calculator
Calculate cubic yards of concrete needed for slabs, columns, stairs, and curb and gutter projects.
Open Calculator →Subnet Calculator
Calculate network address, broadcast address, usable hosts, and subnet mask for any IP range.
Open Calculator →Password Generator
Generate strong, secure, random passwords with custom length, characters, and complexity.
Open Calculator →Conversion Calculator
Convert between units of length, weight, temperature, area, volume, speed, data, and energy.
Open Calculator →