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 Baby Age Calculator — instantly find your baby's exact age in days, weeks, months, and years. Includes corrected age for premature babies, milestone tracker, developmental stage, zodiac sign, birthday countdown, Wonder Weeks leaps, vaccination schedule reference, and clothing size guide.

Free Clay Shrinkage Calculator — calculate wet, dry, and fired ceramic dimensions in both directions. Choose from Earthenware, Stoneware, Porcelain, Air-dry, and Metal Clay presets or enter a custom shrinkage rate.

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 Data Usage Calculator — estimate your monthly mobile or home internet consumption by activity. Enter hours per day for streaming, gaming, video calls, and more to get your GB total and the right data plan.

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.

Free Dating Age Range Calculator using the half-your-age-plus-seven rule. Find your acceptable dating range, check partner compatibility, and see your expanding dating pool.

Free Fuel Mileage Calculator — calculate MPG, trip fuel cost, and compare vehicle efficiency. Supports MPG US, MPG Imperial, km/L, and L/100km with CO₂ emissions and CSV export.

Free Garbage Bag Size Calculator — find the exact trash bag width and height for any trash can shape. Covers round, square, and rectangular cans with overhang control and thickness recommendations.

Free Generator Wattage Calculator — find the right generator size for your home, RV, or jobsite. Select appliances, enter running and starting watts, and get an instant recommended generator size with safety margin.

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.