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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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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 child's blood group

Calculator based on blood group made ​​of both parents, given that they are owned by the child possible blood groups.
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Purchase price / sales tax bill

Financial Calculator will calculate the price of the purchase or sale of Treasury bills and the amount and an annual discount rate.                  
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Generates a message using SHA-2 algorithm.
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Weighted average ratings

The calculator calculates the weighted average of the ratings of the following items.