Projects that fit middle school students, roughly ages 11–14. Every one shows how long it takes, what it costs, what supervision it needs and which variables you are testing.
236 published projects in this collection
This is the sweet spot for science fairs: one variable you change, one you measure, everything else held constant, and at least three trials. Every project below states its variables so the write-up is straightforward.
Each project page carries an at-a-glance panel with a cost estimate, a realistic time estimate, the hazards involved and whether adult supervision is required, so you can check suitability before any materials are bought.
By subject
By school level
By difficulty
Preparing for a fair? Read the science fair guide or record your data in the lab.