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How far was struck by lightning

Calculator based on the specified time from seeing lightning until you hear thunder in the distance calculated discharge occurred.          

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Rainwater tank

The calculator calculates the amount of collected rainwater from the roof of the given dimensions. Long description      
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Calculate how much you drink pure ethanol

On the basis of the data entered, the amount of drink and the percentage of alcohol content calculator calculates pure ethyl alcohol that we consume.
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Battery charging time calculator

Calculator to the data calculates the estimated time of charging.            
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Calculator for tile adhesive

Calculator based on the given surface tiles, tile side length and the number of doors and windows calculates the required amount of adhesive.                  
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Associated ceiling material thickribs

Calculator allows you to calculate the approximate consumption of materials per 1 m2 rib ceiling with ceramic and concrete.
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Perpetual calendar

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Calculator gives what day of the week for the date specified by the user.                  
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The sum of squares of integers from 1 to n

The calculator calculates the sum of squares of consecutive integers from one to the specified value.      
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Iron deficiency

The calculator calculates the dose of iron necessary to adopt a parenteral route to compensate for the normal level of the common deficiency.