50 Genius Science Fair Project Ideas for All Grades

Do you need a science fair project idea?

Look no further!

We have 50 science fair project ideas for kids of all ages – so many cool science fair projects that we couldn’t stop collecting them…

50 Science Fair Projects for all ages - two science fair projects shown
Choose one of these many science fair ideas for the perfect project!!

Science Fair Project Ideas for Elementary to High School Kids!

We’ve rounded up the best science fair project ideas for all ages.

These projects use living things like plants and bacteria. Other projects work with batteries and electricity. And of course there is slime!

If you are interested in the environment, this is a great place to start. There are projects using color for the artists among us. There are ideas about fingerprints and genetics. Sign me up for the projects that use candy.

There’s something for everyone – no matter the grade level. These science project ideas can be used from elementary school to high school.

Getting Started on Your Best Science Fair Project

science fair project tips - finding the best science fair project - image shows equations on a chalkboard with Science Fair Project Tips text
How to choose a science fair project that fits you perfectly…

How to Choose a Science Fair Project

The hardest part of a science fair project can be getting started, so check out these steps!

  • Think about what is interesting to you. Do you love food? Are you obsessed with cats or dogs? Are you curious about soil? You’ll find a wide range of fun topic ideas for your science fair on this list. 
  • Pick a topic or project idea from this list.
  • Brainstorm questions  about the topic. Check out this resource via Science Buddies
  • Turn your idea into a science fair project. Steve Spangler Science explains that there are three steps for turning an experiment or demonstration into a science fair project. Once you find an idea you like, you must change something about it. Then, create a new experiment. Finally, compare results!
  • Use the scientific method for kids to make sure you cover all the important parts of your chosen science fair project…
Download and print this scientific method worksheet for kids pdf shown on a background with markers, pencils and paints.
The scientific method makes sure the experiment is consistent and repeatable!

Here are some great books to get the ideas rolling! (Affiliate links.)

How to Turn Your Science Idea into a Science Project

Some of the ideas in this post are demonstrations that you can turn into projects. For example, consider making your own fire extinguisher. We know that baking soda and vinegar deprives fire of oxygen. This is what puts the fire out. Change the ratio of baking soda to vinegar to create a new experiment and compare results. Or see what changes you can make to to cause your fire extinguisher to shoot the farthest

Below, you’ll find ideas for elementary school, middle school, and high school science fair projects!


best elementary school science fair projects - 4 different ideas shown from magnetic mud to lemon battery
These elementary level science fair project ideas include: magnetic mud project, egg drop project, and lemon battery project

Some kids participate in their first science fair projects in elementary school.

It’s never too early to combine creativity with science! Check out how even preschoolers use the scientific method to explore the science of sunscreen with Kids Activities Blog.

Elementary school students learn about animals and plants. They study cells, the solar system, and weather. Most importantly, elementary students learn to wonder about how the world works.

Here is a list of 15 ideas to introduce kids to the wonderful world of science!

how to make a cushioned egg drop for science fair - girl shown with bubble wrap and washi tape egg ready for egg drop competition
I bet our egg will not break in this egg drop design!

Food Science Fair Project Ideas for Grade Schoolers

This is a classic science fair experiment using a food ingredient – eggs. Be sure to change a variable. It will take some physics knowledge to make the best design. Then compare results to make the egg drop worthy of a science fair!

Maybe I shouldn’t be amazed that you can turn a lemon into a battery, but I am. I really am. Compare results with a potato battery via LoveToKnow. Fruit and veggie batteries make really fun science fair ideas!

Get up close and personal with the genetic code of a strawberry.  Even adults are amazed by how DNA can be pulled from this favorite fruit. Your science fair board will explain it all!

Experiment with dissolving Peeps in different liquids. Then eat the leftovers! Create a science fair project that pulls together a new question or liquid to explore. Your science poster is going to be full of candy fun!

What’s a naked egg? It’s an egg without an intact shell! It’s weird. Check it out. There are so many levels you could take your science fair idea — how long before you could squeeze the egg? What about using different levels of vinegar dilution…oh the science fun!

Explore the relationship between ice and salt with this fun experiment. I first became acquainted with this science fair project idea when it was presented at a magic show. So if you want to infuse your science fair board with some magic…imagine the possibilities!

Magnetic mud experiment for science fair project - child shown making mud move up beaker side with magnet
Mud moves against gravity with a magnet in this science fair idea!

Physics Science Fair Project Ideas for Grades 1-5

Magnets are fun! Mud is fun! Without a doubt, your kid will enjoy combining the two. This science fair project uses ferrofluid which is something that is easy to explain and always amazes.

Do your kids love dinosaurs? Do your kids love slime? If so, you should check out this project. Be sure to download the free science experiment printable.

This is perfect for kids who want a simple project using math. The science fair board will be really fun to make with all your calculations.

Because kids love trains and this copper wire coil, battery and magnets may react a little differently than you expect. What a fun idea for a science fair!

Learn about germs with a soda bottle and a balloon experiment which makes a great science fair project
Use a soda bottle and a balloon for a Science Fair Project about Germs…

Life Science Fair Project Ideas for Grade School

Kids will compare bacteria growth and they will drink soda. It’s a win-win, for the kids at least! This simple idea can be a springboard for a bigger science fair project that can look at different ways and rates of bacterial growth.

This is the “naked egg” experiment that also explores the concept of osmosis! You might consider combining the two within your science fair project for extra things to explore.

This is a list of questions to jumpstart a science fair project for animal-loving kids! Genius for those elementary age kids who are animal crazy…I know I was one of those.

Check out these science projects using plants! This link provides projects with different levels of difficulty including versions that would be perfect for grade school ages.

Solar System Science Fair Project Ideas

  • Solar system project ideas via NASA

NASA put together a list of questions to get kids started on their projects!


middle school science fair projects - boy with microscope and three versions of favorite science fair projects that include plants, colors and finger prints
These Middle School science fair ideas are fun! Check out projects about plants, colors, and fingerprints!

Getting Kids Excited about the Science Fair

Have you and your family watched the movie Wonder?

If your kid isn’t excited about the science fair, check out this movie. The main character and his best friend make a winning  pinhole camera for their science fair. This project would be perfect for a middle schooler interested in light. And of course it’s on our list of project ideas!

Along with the pinhole camera, we have 19 other ideas. Middle schoolers learn about about the human body and cells. They also learn about the environment, electricity, and sound

This list contains projects on these topics and more!

Earth & Environmental Science Fair Ideas for Middle School

Learn about conservation with this grey water recycling system. Try the simple grey water recycling they suggest and then can you think of other ways you could use grey water for your science fair project?

Use this list of project ideas that test hypotheses about the weather. Weather science fair ideas are always winners because while the weather is always around us, it seems like a mysterious force!

Experiment with soil erosion and learn about the importance of vegetation. This is one of my favorite simple science fair ideas. It is visually so impactful and would make a great science fair poster!

Check out this great list of 30 eco-friendly science fair project ideas! So many great ideas…only one science fair.

Isolate and change variables to maximize the geyser explosion. This is always a fun idea and could be adapted for a great science fair project.

Kids will enjoy learning about why garbage smells bad. This could be helpful to everyone who stops by your science fair board and learns!

Genetics Science Fair Ideas for Middle School Students

Projects on genetics are popular because kids learn about themselves and their friends. Check out this taster versus non-taster experiment! Is there a way to get your science fair participants incolved?

Any future forensic scientists out there? In this project, kids create a system for classifying fingerprints! Part science project…part detective!

This is one of the coolest dinosaur related projects! Kids can search databases to find T-Rex’s closest living relative. It is like a genealogy science fair project.

Physical Science Fair Ideas for Grades 5-8

As I mentioned above, this is a project like Auggie’s in Wonder! It is one of the classic science fair projects that are always a win if you can adapt them into something new and enlightening.

Check out this list of science projects using simple machines. One project even involves roller-coasters!

This project creates a model that demonstrates how eardrums work. How cool is the vibrations on this idea?

Try out this list of science fair project ideas that explore magnetism which is always a hit with the science fair circuit.

Did you know you can make a fire extinguisher from common household supplies? If not, this science fair experiment is for you!

Middle schoolers think gas is hilarious. Right or wrong, here’s a science project about gas! Makes me think about the gross science we explored at the Grossology exhibit.

This project considers the relationship between beverage color and taste! This is a really cool idea that had never occurred to me and would make a great science fair board.

You’re probably already using a charcoal filtration system. Kids can learn how water filtration works by making their own!

  • Paper airplane launcher via KiwiCo

Paper airplanes are fun for everyone. Check out this experiment and launch that airplane! It would be fun to try making planes of different sizes, shapes and weights.

How to fold a paper airplane diagram perfect base for science project ideas
Oh so many fun science project ideas from one simple piece of paper…

Check out our paper airplane STEM challenge and building instructions for additional ideas.

Life Science Fair Project Ideas for Middle Schoolers

Experiment with making cells shrink with water.  This explores all sorts of cool science ideas and would make a great fair project.

Do you know how algae grows best? Try this experiment to find out then take it to the next level for your science fair.


best high school science fair projects - crystals, gardening and bacteria shown
These science fair projects for high schoolers are so much fun! Check out crystal experiment, botany experiment, and bacteria experiments!

High school science covers a range of subjects from biology to meteorology.

Therefore, nothing is off limits when it comes to choosing a science fair project idea!

These ideas would be suitable for most high school curriculum. When looking through the list, remember that you can make any of these ideas more complex by changing variables and comparing results.

Genetics Science Fair Ideas for Grades 9-12

Calling all cat people! In this experiment you will discover the relationship between chromosomes and cat coat coloring. I can see the science fair board right now…

This fingerprint detection project is perfect for the high schoolers who love true crimes! This will be one science fair idea that everyone will want to get in on.

Earth Science Science Fair Ideas for High School Students

Discover which plants grow best locally and the impact these plants have on the environment. This combines design with science which can be leveraged for the artistic scientists.

There are so many great plant projects here! You are going to have a hard time narrowing down what you want to use for the science fair!

Experiment with growing your own crystals. We have had so much fun learning how to make crystals and they would make a really fun science fair project.

Life Science Fair Ideas

Check out this list of questions to start a project about bacteria. So many ideas that would work great when adapted to a science fair.

This is a great microbiology experiment and something you are sure to learn from which is always a good foundation for the best science fair ideas.

Hypothesize and learn about starch in photosynthesis. Oh what science-y fun (totally a word).

Test whether food picked up from the floor within 5 seconds collects less germs than food dropped for a longer amount of time. I do not recommend eating the dropped food, 🙂 but you may prove me wrong in your science fair project!

Discover how acidity can affect survival rates of a population! This is such an interesting topic for a science fair project.

Physical Science Fair Ideas for Grades 9-12

Impress science fair judges by designing and testing your own heart rate monitor! 

Use electrolysis to split water into hydrogen and oxygen. Then test the gases and test something else for your science fair idea.

Did you know plastic can be found in milk? This is a fun project using regular household supplies.

Check out this list of project ideas dealing with drug addiction. These are science fair ideas that can make a difference.

  • Increase the amount of oil that can be moved through a pump via LiveScience

Use a clear household spray bottle to simulate a crude oil pumping station! How cool is this science fair idea?

Discover 50 science fair projects for all ages from elementary school to middle school to high school level ideas - shown on blackboard
Which science fair project will you choose?

Maybe one day your little scientist will make it big. In the meantime, we hope these ideas inspire great learning experiences. That’s the purpose of science fairs!

If you are looking for more science activities, be sure to  check out 150 Kids Science Activities via Kids Activities Blog.

More Science Ideas from Kids Activities Blog

Comment below to tell us how your science fair project turns out! We would love to hear about it!

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