Free Online Calculators.
Fast, Simple & Accurate.
Free online calculators for dates, time, conversions, math and finance. Use our free date calculator and other tools to get fast, accurate results. No sign-ups. No clutter.
Choose a Calculator
Select a category to quickly find the tool you need.
📅 Date & Time Calculators
Calculate dates, times, durations, weekdays, time zones and more with fast, accurate and free tools.
Days Between Dates
Calculate the exact number of days, weeks, or months between any two dates.
Try it →Add or Subtract Days
Add or subtract days, weeks, or months from any date instantly.
Try it →Age Calculator
Find out your exact age in years, months, and days from your birthday.
Try it →Business Days Calculator
Calculate working days excluding weekends and holidays.
Try it →Weekday Calculator
Find out what day of the week any date was or will be. Perfect for planning and history.
Try it →Countdown Timer
Find out how many days, hours, and minutes are left until your special event.
Try it →Time Zone Converter
Convert time between different time zones worldwide. Perfect for international meetings and travel.
Try it →Week Number Calculator
Find the ISO week number for any date. Essential for planning and business scheduling.
Try it →Time Duration Calculator
Calculate hours and minutes between two times, subtract breaks, and handle overnight durations.
Try it →📏 Unit Converters
Convert common measurement units quickly and accurately.
Length Converter
Convert meters, feet, inches, kilometers, miles and other length units.
Try it →Weight Converter
Convert kilograms, pounds, ounces, grams, stone and other weight units.
Try it →Temperature Converter
Convert Celsius, Fahrenheit, Kelvin and Rankine instantly.
Try it →Area Converter
Convert square meters, square feet, acres, hectares and more.
Try it →🔢 Math Calculators
Simple tools for everyday mathematical calculations.
Percentage Calculator
Calculate percentages, percentage changes, discounts and more.
Try it →Fraction Calculator
Add, subtract, multiply and divide fractions with simplified and decimal results.
Try it →Average Calculator
Calculate the average, sum, count, minimum, maximum and range of a set of numbers.
Try it →Ratio Calculator
Simplify ratios and solve proportions to quickly find missing values.
Try it →💰 Finance Calculators
Useful tools for savings, loans, interest and personal financial planning.
Savings Goal Date
Calculate the estimated date you’ll reach your savings goal.
Try it →Loan Calculator
Estimate monthly loan payments, total interest and total repayment.
Try it →Compound Interest Calculator
Estimate investment growth, contributions and compound interest over time.
Try it →Savings Calculator
Estimate future savings from your starting balance, monthly deposits and interest.
Try it →