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Building

Insulation of wall

Jak policzyć izolację ścian?
Calculator allows you to calculate the amount of insulation panels needed to cover the walls of the building using the "light wet" or "dry light" methods.
17511
Math

Number of tetrahedral

Tetrahedral numbers are the natural numbers, for which it is possible to construct a tetrahedron formnego of bullets. They are a special case of the pyramidal numbers.        
99669
Calendar

Perpetual calendar

jak obliczyć dzień tygodnia na podstawie daty?
Calculator gives what day of the week for the date specified by the user.                  
66939
Verifiers

Verification of the social security number in Poland

It presents data deriving from the unique social security number, such as date of birth, sex, serial number and check its correctness.
29460
Medical

The maximum blood loss

Calculator on the basis of these data calculates how much blood you can lose up to keeping you alive.