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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In this project, you'll build a model of the earth, complete with all seven continents and four major oceans.
Third Grade
Earth & Space Science
Calculate the mass of the Earth using the sidereal and calendar period of the Moon and Newton's Law of Universal Gravitation in this physics science project!
Ninth Grade
The purpose of this project is to determine if there are fluctuations in the rising and the setting of the sun and the position of the earth as it rotates.
High School
Earth & Space Science
Science fair project which measures the shadow cast by a meter stick at various times in order to predict the circumference of the earth.
Fifth Grade
Sixth Grade
In this cool elementary school science fair project idea make a model to learn what happens to the Earth's surface when ice moves over land.
Elementary School
Prove that the Earth is not flat. The objective of this science fair project is to measure the angle of the sun and calculate the circumference of the Earth.
Elementary School
Fourth Grade
What if the shape of the Earth weren't spherical? How does its shape affect our gravity, climate, and tides? Model these questions in this cool project!
Seventh Grade
Get a cool physics science fair project idea for advance middle school and high school students on measuring the Earth's magnetic field.
Middle School
High School
Learn about the layers of the Earth and make a model! Create a earth layer book, cake, or clay diagram.
Second Grade
What is the hydrologic cycle and how does it work? Check out this fun and easy science project where you will model and learn about Earth's water cycle!
Fifth Grade
Learn how to make a ping pong ball anemometerâa device used to measure wind speedâin this free science fair project idea.
Fourth Grade

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