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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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Converter phone number

The converter accepts input alphanumeric phone number and converts it to a numeric format.    
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Examine the variability of the quadratic function

Calculator examines the variability of the course of a quadratic function in the field of real numbers.
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Health

Calculator / BMI - Calculate Body Mass Index indicator

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The online BMI calculator calculates the body mass index - BMI - based on height and weight entered.                      
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Financial

Redemption value calculator

Calculator based on the given amount of capital, the interest rate and the number of years calculated the approximate value of the redemption. The redemption value - part of the premiums paid in the form of financial resources, which is fixed in the contract returns a policyholder in case of cancellation of insurance before the end of the contract.                    
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Resistivity and conductivity

The calculator calculates the resistivity and conductivity of the material from the resistance, cross-sectional area and the length of the element at 20 ° C.