Science Fair Project Ideas has assembled a vast collection of science fair project ideas written by science teachers, professional scientists, and educational consultants on popular science fair topics ranging from physics and chemistry to biology and even sociology. We offer free science fair ideas suitable for every grade level, be it preschool, kindergarten, elementary school, middle school, or high school. Check the boxes in the sidebar to filter your results, or use the search bar to find that perfect science fair project or experiment your child will be sure to love.

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The project examines absorbent polymers absorbency in disposable diapers and their unique ecological problem to the environment.
Elementary School
Fourth Grade
Learn about the greenhouse effect- and get great science fair experiment ideas. Read more.
Middle School
Electricity and Magnetism
This science fair project idea focuses on saturated and unsaturated lipids (fats and oils).
Middle School
In this project, the fingerprints of family members are compared to determine if people from the same family have similar fingerprints.
Fourth Grade
In this free science fair project idea, we learn about sound waves and how they transmit power and energy.
Middle School
In this free science fair project idea, we learn how constructive interference can make colors appear in a substance with a thin film of a separate substance.
Middle School

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