Free Online Calculators
Quick, free calculators for everyday questions: how old your pet is in human years, your exact age down to the second, the time between two dates, working days for a deadline, what time to go to bed, how much to tip, your GPA, and your running pace. Pick a tool below.
Pet Ages
Age & Birthdays
- How Old Am I?Your exact age in years, months, and days, plus your next birthday.
- Age Difference CalculatorThe exact age gap between two people or dates.
- Half Birthday CalculatorFind the date of your half birthday (and quarter birthdays).
- Chronological Age CalculatorAge in years, months, and days for assessments and evaluations.
- Anniversary CalculatorWhich anniversary is it, and its traditional and modern gifts.
Dates & Time
- Date CalculatorAdd or subtract days, weeks, months, or years from any date.
- Time Duration CalculatorThe exact time between two dates, down to the second.
- Business Days CalculatorWorking days between two dates, excluding weekends and holidays.
- Time CalculatorAdd and subtract hours, minutes, and seconds.
- Time Card CalculatorWeekly work hours from clock-in/out times, with breaks and overtime.
- Military Time ConverterConvert between 12-hour and 24-hour (military) time, with a full chart.
Everyday
Running
About These Calculators
The Word Finder's calculator collection covers ages, dates, times, and everyday math, the conversions people reach for every day. The pet tools convert dog years and cat years to human years using the charts vets actually use instead of old folk multipliers, with standalone reference charts for dogs and cats .
The date and time tools use exact calendar math, including leap years and (for the business days calculator) national public holidays in the US, UK, and Australia. The date calculator answers "what's 30, 60, or 90 days from today", and there are live countdowns to the big holidays, like days until Christmas and days until Halloween. Runners can pair the pace calculator with printable marathon and half marathon pace charts. For word games and puzzle tools, head to The Word Finder homepage .
Frequently Asked Questions
Yes. Every calculator on this page, from pet ages and exact age to dates and times, work hours, sleep, tips, GPA, and running pace, is completely free, with no sign-up required.
Yes. All of the tools are built to work on phones, tablets, and desktops, and the inputs and results adapt to small screens.
Date and time tools use exact calendar math, including leap years. The pet age calculators use the veterinary charts recommended by vets. The business days calculator accounts for national public holidays in the country you select.
Absolutely. Use the feedback option on any page to tell us what you would like to see next.