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831 tools
Calculate your age accurately by a set date with our easy-to-use age calculator tool. Answer the question, how many days old am I instantly! Try it now.
This free date calculator computes the difference between two dates. It can also add to or subtract from a date. Both can deal with business days and holidays.
A random password generator to create strong and secure passwords. To ensure security, they are generated on the webpage without being sent over the internet.
This calculator computes any of the values in the half-life formula given the rest values. It also converts between half-life, mean lifetime, decay constant.
This free time calculator can add or subtract time values in terms of number of days, hours, minutes, or seconds. Also, learn the different concepts of time.
Free calculator to get the number of hours, minutes, and seconds between two times. Also, a full version to calculate the time duration between two dates.
This free concrete calculator estimates the amount of concrete necessary for a project and can account for different shapes and quantities.
This free voltage drop calculator estimates the voltage drop of an electrical circuit based on the wire size, distance, and anticipated load current.
Calculator to compute the time to wake up or go to bed based on sleep cycle or duration of sleep required. Also learn more about sleep.
This calculator estimates heat index temperature felt by the human body based on the actual measured air temperature together with humidity level or dew point.
This free dew point calculator calculates dew point, relative humidity, or air temperature if given any of the other two values.
Free calculator to find the sales tax amount/rate, before tax price, and after-tax price. Also, check the sales tax rates in different states of the U.S.
This free exponent calculator determines the result of exponentiation, including expressions that use the irrational number e as a base.
Use this fraction calculator to perform all the main calculations on simple or mixed fractions. We support addition, subtraction, multiplication, division of fractions, fraction simplification, and two types of conversions: fraction to decimal and decimal to fraction.
This free percentage calculator computes a number of values involving percentages, including the percentage difference between two given values.
This ratio calculator solves ratios, scales ratios, or finds the missing value in a set of ratios. It can also give out ratio visual representation samples.
The scientific notation calculator converts decimals into scientific notation. Explore the rules of scientific notation for a thorough understanding.
Calculate the geometric mean of up to 30 values with this geometric mean calculator.
Find the harmonic mean of up to 30 values with this harmonic mean calculator.
This mean calculator determines the three most popular means: arithmetic, geometric, and harmonic of any dataset!
Free online percentage change calculator with step-by-step calculations. Perfect for students, teachers, and professionals needing quick mathematical computations.
Free online percentage decrease calculator with step-by-step calculations. Perfect for students, teachers, and professionals needing quick mathematical computations.
Free online percentage difference calculator with step-by-step calculations. Perfect for students, teachers, and professionals needing quick mathematical computations.
Free online percentage increase calculator with step-by-step calculations. Perfect for students, teachers, and professionals needing quick mathematical computations.