Online calculator catalog
Life 51
	Calendar   Moonphases,   Old Russian (Byzantine) system of chronology,   Date and number of working days (for Russia),   Days between dates. The historical version.,   Gregorian calendar. Julian calendar. The calendar eras., ... +13
	Date and Time   Total time,   Sobriety calculator,   Time difference between the cities,   Date to timestamp converter,   Days count in several date spans, ... +36
	Health   Body fat calculator - YMCA formula,   Ideal weight calculator using Paul Broca formula,   Ideal weight calculator using Body Mass Index,   The basal metabolic rate,
Professional 154
	Computers   Hill cipher,   Caesar cipher,   Base 64 encoding and decoding,   Simple math in any numeral system,   Huffman coding, ... +15
	Engineering   Parallel and perpendicular lines on a plane,   Sine wave,   Trigonometric functions,   Hyperbolic functions,   Determining air humidity with psychrometric method, ... +48
	Finance   Bank card number validation,   Price based on running meter,   Progressive tax,   Loan payment example,   Mortgage calculator, ... +8
	Navigation   Beaufort scale,   Sunrise and sunset time,   Flag semaphore signals,   Compass, magnetic and true course.,   Nautical measurement units, ... +11
	Statistics   Direct observation error analisys,   Tips and tricks #8: How to reuse existing calculator,   Weighted moving average,   Geometric Distribution. Probability density function, cumulative distribution function, mean and variance,   Probability Urn simulator, ... +34
	Telecommunications   Flag semaphore signals,   Telecommunications traffic, Erlang,   VOIP call bandwidth,   PBX channel number calculation,   Number of agents in call center,
	Units converters   Conversion between imperial and metric units of area,   Display aspect ratio and dimensions,   Conversion of decimal number to other notations,   Converting degrees to radians,   Conversion of pounds into inches, ... +14
Study 233
	Astronomy   Angular size, linear size and distance,   Azimuth and solar elevation angle,   Shadow length,   Sunrise and sunset calculator,   Sun position at a given date. Azimuth and elevation table., ... +2
	Chemistry   Molar volume,   Convert moles to grams and grams to moles.,   Alcohol amount in the aqueous alcohol solution,   Convert moles to liters and liters to moles,   Chemical equation balancer, ... +6
	Math   Tips and tricks #9: Big numbers,   Bin packing problem,   Combinatorics. Combinations, arrangements and permutations,   Multiplication in columns,   Regular polygon, number of sides and length of side from incircle and circumcircle radii, ... +164
	Physics   Wind Chill Index,   Volume of body given the buoyant force,   Hydrostatic pressure,   Surface tension. Weight and volume of the drop of liquid,   Kinematic Equations for Uniform Acceleration, ... +42