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The harmonic mean

Calculator based on the entered numbers separated by commas calculate the harmonic mean.        

Long description



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Weighted average ratings

The calculator calculates the weighted average of the ratings of the following items.              
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Conversion between number bases

Converter allows you to convert numbers between number bases - binary (binary), trójkowym, czwórkowym, Friday, szóstkowym, siódemkowym, octal (octal), dziewiątkowym, decimal (decymalnym) jedenastkowym, dwunastkowym, trzynastkowym, czternastkowym, piętnastkowym, hexadecimal (hex). Typed characters that are not numbers and the letters A, B, C, D, E, F are ignored.      
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Trigonometric functions calculator

Calculator by entering an angle in degrees or radians calculated values ​​of the basic trigonometric functions.
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Calculator social security contributions - the calculation of rates in Poland

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Calculator to calculate gross salary given social security contributions deducted from the salary of the employee and the employer. [since 2008]            
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Battery charging time calculator

Calculator to the data calculates the estimated time of charging.            
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Whether a number is prime

Checks the user number is a prime number.
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Perpetual calendar

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Rainwater tank

The calculator calculates the amount of collected rainwater from the roof of the given dimensions. Long description