Descent Rate Calculator

This page allows you to predict the speed at which your rockets will descend. Note that it is only an estimate, and values will vary with wind, etc.

Enter rocket mass in oz:
Enter parachute diameter in inches:

Choose the shape of your parachute (Choose the closest shape to the shape of your chute if it is not listed here)
Circle Hexagonal Square

How did you measure the diameter of your chute (if it isn't a circle)?
Not applicable: I used a circular chute I measu#FF0000 from one corner to another I measu#FF0000 from one side to another

Choose a unit to calculate with
Feet per second Meters per second Kilometers per hour Miles per hour

Descent speed: (descent speeds are rounded to three decimal places)

Some people go by the rule of thumb that a rocket should hit the ground at about 15 ft/sec or slower for a safe landing. Your parachute should be about inches diameter to come down at this speed.

Hit the "Clear" button to clear the form and re-enter your data