Date and Time
Free date and time tools to calculate age, durations, days between dates, business days, the day of the week and time zones.
16 tools
Age Calculator
Find an exact age in years, months and days from a date of birth.
Date and Time
Date Difference Calculator
Count the days, weeks, months and years between two dates.
Date and Time
Time Duration Calculator
Work out the hours, minutes and seconds between two times.
Date and Time
Countdown Calculator
Count the days, hours and minutes until (or since) any date.
Date and Time
Date Calculator (Add / Subtract)
Add or subtract days, weeks, months or years from any date.
Date and Time
Time Zone Converter
Convert a date and time between world time zones, with daylight saving handled.
Date and Time
Hours Calculator
Work out hours between a start and end time, minus breaks.
Date and Time
Day of the Week
Find the weekday, day of year and ISO week for any date.
Date and Time
Business Days Calculator
Count the working days (Mon–Fri) between two dates.
Date and Time
Leap Year Checker
Check whether a year is a leap year and find the next one.
Date and Time
Military Time Converter
Convert between 12-hour and 24-hour (military) time.
Date and Time
Birthday Countdown Calculator
Count the days until your next birthday and the age you will turn.
Date and Time
Moon Phase Calculator
Find the Moon’s phase and illumination for any date.
Date and Time
Roman Numeral Date Converter
Convert a date into Roman numerals.
Date and Time
Week Number Calculator
Find the ISO 8601 week number for any date, plus the weekday and ISO year.
Date and Time
Time Zone Meeting Planner
Find the hours that fall inside the working day for everyone, across up to 8 time zones.
Date and Time
Browse other categories
Finance and Loans
Free finance and loan calculators — work out EMI, monthly payments, simple and compound interest, amortization and the true cost of borrowing.
24 tools
Investment
Plan your investments with free calculators for SIP, compound growth, ROI, CAGR, retirement, savings goals and long-term wealth building.
21 tools
Business and Ecommerce
Free business and ecommerce calculators for profit margin, markup, break-even, ROAS, CPM, conversion rate, AOV and unit pricing.
33 tools
Real Estate
Free real estate calculators for mortgage payments, home affordability, down payment, rent vs buy, rental yield and cap rate.
14 tools
Insurance
Free insurance calculators to estimate life cover, term premiums, human life value, health insurance costs and claim amounts.
5 tools
Health and Nutrition
Free health and nutrition calculators for BMI, daily calories, BMR, TDEE, macros, body fat, ideal weight and water intake.
18 tools
Fitness
Free fitness calculators for calories burned, one-rep max, running pace, TDEE, body fat and training targets — fast and private.
12 tools
Mathematics
Free math calculators for percentages, fractions, averages, statistics, ratios, combinations, scientific notation and more.
39 tools
Education
Free education calculators for GPA, grades, study time and exam scores to help students plan and track their progress.
5 tools
Unit Converters
Free unit converters for length, weight, temperature, speed, area, volume, power, time and currency — see every unit at once.
16 tools
Text and Writing
Free text tools to count words, change case, remove duplicates, find and replace, check readability and clean up your writing.
26 tools
Developer Tools
Free developer tools to format, minify, validate and encode — JSON, CSS, regex, base64, JWT, hashes, cron and HTML utilities.
57 tools
SEO and Website Tools
Free SEO and website tools to generate meta tags, Open Graph, Twitter cards, FAQ schema, robots.txt, slugs and SERP previews.
15 tools
Image Tools
Free image tools to compress, resize, crop, convert and extract colours — all processed privately in your browser, no uploads.
22 tools
PDF and File Tools
Free PDF and file tools to merge PDFs, split pages and convert documents right in your browser — private, with nothing uploaded.
12 tools
Security and Privacy
Free security and privacy tools to generate strong passwords and passphrases, hash text, check password strength and validate cards.
9 tools
Travel and Vehicle
Free travel and vehicle calculators for fuel cost, fuel economy, trip distance, speed and time, and auto loan payments.
9 tools
Random Generators
Free random generators — numbers, dice rolls, coin flips, name pickers, colours, passwords and UUIDs, all quick, fair and private.
8 tools
Productivity
Free productivity tools including a Pomodoro timer, stopwatch, countdown, QR code generator and everyday helpers to save you time.
26 tools
Science and Engineering
Free science and engineering calculators for Ohm's law, force, density, energy, pressure, resistor colour codes and conversions.
27 tools