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