Everyday Calculations

Free Age Difference Calculator — instantly find the exact age gap between two people in years, months, days, weeks, and total days. Supports birthdate, birth year, and direct age entry modes.

Free Appliance Wattage & Energy Cost Calculator — estimate daily, weekly, monthly, and yearly electricity costs for any home appliance. Add up to 10 appliances, compare LED vs incandescent savings, see CO2 emissions, and project future costs with rate increase forecasting.

Free College GPA Calculator — compute your semester GPA, cumulative GPA with prior history, plan the grades you need to hit a target GPA, and download a CSV of your full course record.

Free Date Countdown Calculator — count down days, hours, minutes, and seconds to any upcoming event. Track business days, set holiday exclusions, and save multiple countdowns.

Calculate gpa quickly and accurately

Free Letter Grade Calculator — convert percentage scores or points into letter grades (A+ through F), GPA equivalents, and weighted averages. Includes EZ Grader mode and Final Exam Planner.

Free Pomodoro technique calculator — plan your work sessions, calculate total focus time, breaks, and estimated end time using the classic 25/5, 52/17, 90/20, or custom intervals.

Free Test Score Calculator — instantly convert wrong answers or points earned into a percentage score and letter grade. Supports standard and extended (A+/A-) grading scales, bonus points, a grade breakdown table, and a reverse calculator that tells you how many questions you can miss to earn a target grade.