Welcome to Objective Design of Experiments

Minimal Trials Calculator

Number of Factors:

Model:
Interaction Full Quadratic Full Cubic

Please enter the number of factors to study and the model to fit.
You can purchase a Sample Size Calculator for just $14.95.

This calculator tells you the bare minimum number of experimental trials required to fit a model.

It's best to add at least 3 extra trials in a real experiment.

You should also add at least 5 replicates to your design.

Count on running at least 8 runs more than the minimum using an I-Optimal Design.