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

This Calculator serves 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.

Average diameter of the hailstone in cm:






Density of the ice in g/cm³:

Air density in kg/m³:

Drag coefficient (cw-value):  

Weight (mass) of the hailstone in g:

Fall velocity in km/h:

Energy of the hailstone in Joule:


Size of the hailstone compared:

Background to this Calculator

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).

Further calculation tool:

last modification: march 2018