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Fun Heart Science Projects for Science Fairs

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Learning about the heart or the circulatory system? These heart science projects will fit right in with any elementary or middle school science themes about the heart.

Many science teachers like teaching about the heart during February for Valentine’s Day (because love). Some of the experiments on this list feature fun Valentine’s Day themes like candy and hearts as part of the experiment, but not necessarily about the human heart itself.

Add these heart science experiments to your list of science fair project ideas!

11+ super fun and hands-on heart science projects for kids! These heart science experiments would be perfect science fair projects!

What are Heart Science Projects?

A heart science project is a science project that is all about the heart! There are some that are about how human hearts work, and some that just contain heart shapes (because hearts are fun!).

Both types of experiments are designed to help children better understand a scientific concept or the process of science investigation.

How to do a Heart Science Experiment

heart science experiment ideas

Every heart science experiment is a little different, depending on your goals.

However, there are two main purposes to any science experiment (or demonstration).

The first purpose is to demonstrate a scientific concept (like showing how the circulatory system works).

The second purpose is to show how to conduct an experiment with a hypothesis, variables, and the recording of results.

Any of the heart science projects on this list can be done as demonstrations or as experiments, depending on how you set them up.

For home science experiments, we tend to do more demonstrations to get kids excited about science. But in the classroom, we like to run the experiments as true experiments so that children get a rounded STEM education.

What You Need for a Science Fair

You’ll want to have these supplies on hand before doing your science fair project. Shop the included Amazon storefronts to make things easier and don’t forget to download the free science fair planning checklist before getting started!

Science Fair Project Planning

When you’re planning your project, you want to keep everything organized. Click the image below to get my free science fair project checklist so you can start organizing your project from the start.

You may also want to check out this list of science fair project research supplies.

Supplies for a Science Fair Project

There are so many supplies for science fair projects that are individual to each project, but if you want a general list of possible supplies and inspiration for your project, check out my selection of science fair experiment supplies on Amazon.

Supplies for a Science Fair Presentation

Your science fair presentation is important! It should look presentable and eye-catching. Check out this list of my favorite science fair presentation supplies.

science fair display board example

The Complete List of Heart Science Projects

Whether you are looking for a heart science project that is about the human heart, or just a heart science project featuring hearts, you’ll find the best collection of experiments here.

Use these science demonstrations to illustrate the scientific concepts that your class is currently learning in February. Use these experiments in a science fair or as part of Valentines STEM activities!

Heart Science Experiments about the Human Heart

3D Heart Model

Learn about the chambers of the heart and the circulatory system when you make this 3D heart model from clay. You can make it as simple or as detailed as you like! Combine this model with one of the circulatory system models and make a functioning heart.

Learn about the Circulatory System

This is a comprehensive study on the complete circulatory system that is hands-on and tons of fun for kids. It’s a fun way to see how the heart connects with the entire body and how important it is!

Make a Functioning Heart Model

Make a working heart models and find out just what the heart does!

Heart Science Projects featuring Hearts

low prep heart science experiments

Squishy Circuits Light-Up Heart

Circuits are super cool, and squishy circuits make them accessible for kids. Learn about electrical science when you make a light-up heart!

Dancing Candy Heart Experiment

Make those candy hearts dance! This candy heart experiment is a fun twist on the classic alka-seltzer lava lamp science project.

DIY Lollipop Hearts

Take science into the kitchen! Learn about states of matter and how temperature can change the state of matter in this fun and edible heart science project.

Fizzing Heart Reactions

Learning about chemical reactions never gets old. Kids love fizzing and bubbling experiments. Give this one a Valentine’s Day twist with these red heart blocks.

Valentine Heart Chromatography Experiment with Markers

Find out what colors are hidden inside of non-primary colors. How many colors are actually in a black marker? What about a brown marker? Shape your filter paper into hearts and check out shades of pink and purple to make this Valentine’s Day themed.

Salt Crystal Hearts Science Experiment

Learn about crystal formations and solutions with this classic science experiment. Form your pipe cleaners into heart shapes to make fun decorations for Valentine’s Day!

Heart-Shaped Rock Candy

Learn about how crystals form and how to make rock candy in this fun Valentine’s Day twist on the classic candy experiment.

Chasing Hearts Science Experiment

Did you know that dry erase markers float in water? This chasing hearts challenge is a fun way to combine physics with a study of the heart.

Heart Viscosity Experiment

This fun Valentine’s Day science experiment teaches kids about the viscosity of liquids using hearts!

Valentine Heart Density Jar

Make this density jar and drop in different Valentine hearts to see how dense they are!

science fair display board example

More Science Fair Project Ideas

Marshmallow Science Fair Projects for Elementary

Easy Candy Science Fair Projects Kids and Parents Will Love

Science Fair Projects for Active Kids Who Need to Move

Science experiments with kitchen supplies

Save this idea for later so you don't forget to use it!