26868
Chemical
Radioactive decay
The calculator calculates how much radioactive material remains after a certain period of time.
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Chemical
Calculator enthalpy
Enthalpy calculator is used to calculate the heat transfer during the process kwazistatycznego occurring in a closed thermodynamic system under constant pressure (isobaric process).
42116
Chemical
Dilution of solutions
Legend of given volume and calculates the concentrations of the solutions before and after dilution of the volume of solution added is calculated.
31305
Chemical
Molar concentration of mass and volume
Calculator allows to determine the molar concentration of the solution.
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Math
Percentage calculator
This calculator allows you to calculate the percentage of the given numerical values.
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Math
Number cheerful
Checks the calculator is a large number of so-called gay (Happy Number). Number gay is a natural number is defined as follows: Calculate the sum of squares of digits of the number. Repeat this process for the next results as long as we get the number 1 or the results will be repeated. If you have received as a result of one, the original number is the number of gay. Otherwise, a number bleak.
21500
Verifiers
Verifier ISMN numbers
Calculator allows you to verify the number entered ISMN (International Standard Serial Number Printing music).
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Financial
Return on investment over the
Calculator allows you to calculate the return on equity of investment in any financial instrument in relation to the value obtained at the beginning and end of the period.
24512
Medical
Calculator index of renal failure (Renal Failure Index)
Calculator to the data: the amount of sodium in the urine, serum creatinine and urine of renal failure calculates the RFI.