https://www.progressiveautomations.com/blogs/how-to/connect-dc-speed-controller-linear-actuator

The tests done for these user predictions should be carried out with the load which the actuator would be expected to carry, to ensure accurate results. It should be noted that these kinds of calculations will not work if the load which an actuator is expected to carry will change sporadically. For the calculations to work, users should test the actuator with all the loads before it is installed.