Calculation of Weight (mass), Velocity and Energy of falling Hailstones

This Calculator serves among other parameters the calculation of weight (actual: mass), fall velocity (near the ground) and the released energy of hailstones hitting the ground or an object depending on average diameter, shape (drag coefficient) and density of the hailstone, as well as air density.

For the density of the hailstone and the air density, as well as drag coefficient assumed values are already filled in (can be changed), the average diameter of the hailstone has to be indicated.

In case of use of decimal places, please use "." as decimal seperator (e.g.: 9.9)! After a click on the button "Calculate" the results are displayed with a yellow background.

average diameter of the hailstone in cm




density of the ice


air density


drag coefficient (cw-value)

weight (mass) of the hailstone


fall velocity


energy of the hailstone


The density of clear ice has got a value of around 0.9 gram per cm³. But hailstones often have alternately layers of clear ice and such with white ice, which contains more air and has a lower density.

The assumed value for air density of 1.2 gram per cm³ applies for standard conditions near the ground in low altitude.

A sphere has a drag coefficient of 0.45, but hailstones are more ovally often and do not always have a smooth surface (in extreme cases the surface can be even jagged - especially with extremly large hailstones).

last modification: october 2017

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