Online calculator catalog
Life 50
	Calendar   Julian Day,   Age,   Number of working days between two dates (for Russia),   Days count in several date spans,   Moonphases, ... +13
	Date and Time   Day of week by date,   Days count in several date spans,   How many hours between two days,   Julian and Gregorian calendars,   The Muslim calendar. The Gregorian calendar conversion, ... +35
	Health   Ideal weight calculator using Body Mass Index,   Body fat calculator - YMCA formula,   The basal metabolic rate,   Ideal weight calculator using Paul Broca formula,
Professional 153
	Computers   Conversion of fractional numbers between numeral systems,   Regular expression tester,   LL1 grammar analysis. Yet another top-down parser generator.,   Vigenère cipher,   Caesar cipher, ... +15
	Engineering   Volume of liquid in a tilted tank with hemispherical heads,   Cartesian and polar two-dimensional coordinate systems,   Inverse Hyperbolic Functions,   Altitude of a triangle,   Determining air humidity with psychrometric method, ... +48
	Finance   Percentage,   When it becomes profitable to pay the tax as a sole proprietor?,   Simple Interest,   Mortgage calculator,   Progressive tax, ... +8
	Navigation   Beaufort scale,   Prospect distance from the ground and line of sight distance between two observers,   Flag semaphore signals,   Points of the compass,   Course angles and distance between the two point on the orthodrome(great circle), ... +11
	Statistics   Paired Sample t-Test,   Poisson Distribution. Probability density function, cumulative distribution function, mean and variance,   Weighted moving average,   Estimated Mean of a Population,   Analytical performance indicators, ... +33
	Telecommunications   Telecommunications traffic, Erlang,   PBX channel number calculation,   Flag semaphore signals,   VOIP call bandwidth,
	Units converters   Converting degrees to radians,   Conversion from decimal numeral system,   Cartesian and polar two-dimensional coordinate systems,   Nautical measurement units,   Binary, inverse and complement codes, ... +14
Study 229
	Astronomy   Azimuth and solar elevation angle,   Shadow length,   Julian Day,   Sun position at a given date. Azimuth and elevation table.,   Angular size, linear size and distance, ... +2
	Chemistry   Molar volume,   Convert grams to liters and liters to grams,   Convert moles to liters and liters to moles,   Raoult's Second law and the freezing temperature.,   Chemical equation balancer, ... +6
	Math   Geometric progression,   Student t-distribution,   Regular polygon, number of sides and length of side from incircle and circumcircle radii,   Noisy function generator,   Counting pipes from the end face, ... +161
	Physics   Kinematic Equations for Uniform Acceleration,   Relative humidity to absolute humidity and vise versa calculators,   Celsius to Fahrenheit calculator explained,   Calculation of weight by volume,   Battery discharge time depending on load, ... +41