275+ Cool Science Fair Project Ideas for 7th Grade in 2025

Discover simple and fun science fair project ideas for 7th grade! These easy experiments will help you learn and impress at the science fair.

Want to create an awesome science fair project? Whether you’re curious or love experiments, this guide has great ideas for 7th graders. These projects are easy, fun, and will help you learn cool science.

You can explore topics like how liquids affect plants, build fun models, or try chemistry experiments.

Let’s jump in and find a project that’s perfect for you. These ideas will help you learn and have fun, and maybe even win a prize at the science fair!

Table of Contents

Science Fair Project Ideas for 7th Grade PDF

Science Fair Project Ideas for 7th Grade Download

Importance of Science Fairs

Have a close look at the importance of science fairs:

Sparks Curiosity: Science fairs make students excited to learn.
Teaches Problem-Solving: Students learn to ask questions and find answers.
Boosts Creativity: Students create unique projects.
Develops Research Skills: Students practice gathering and using information.
Improves Speaking Skills: Presenting teaches how to talk in front of others.
Encourages Teamwork: Group projects teach working together.
Builds Confidence: Completing a project helps students feel proud.
Opens Career Paths: Students discover interest in science careers.
Promotes Critical Thinking: Students learn to think carefully and test ideas.
Celebrates Success: Science fairs recognize hard work and new ideas.

Science Fair Project Ideas

Here are some of the best science fair project ideas:

Physics

Test how light travels through different materials.
Investigate how friction affects motion.
Study how magnets attract and repel objects.
Test how the weight of an object affects its fall speed.
Measure how sound changes with different materials.
Investigate how air pressure affects balloon size.
Study how objects bounce on different surfaces.
Measure how temperature affects the speed of a ball rolling down a ramp.
Test how the angle of a ramp changes the speed of a car.
Investigate how heat moves through different materials.

Chemistry

Test how temperature affects the speed of a chemical reaction.
Investigate how different substances react to vinegar.
Study how baking soda and vinegar create gas.
Explore how acids and bases react with indicators.
Test how salt affects the freezing point of water.
Study how sugar dissolves in hot and cold water.
Investigate how different materials dissolve in water.
Study how temperature affects the rate of rusting.
Test how soap works to clean dirty water.
Study how different metals react with water.

Biology

Grow plants under different light conditions.
Investigate how the amount of water affects plant growth.
Study how exercise affects your heart rate.
Test how sugar affects yeast growth.
Study how germs spread using soap.
Investigate how temperature affects how fast plants grow.
Explore how insects help plants grow.
Study how animals adapt to different environments.
Test how food affects the health of bacteria.
Investigate how different liquids affect plant roots.

Earth Science

Study how rocks break down over time.
Test how wind shapes sand dunes.
Measure the temperature of soil at different depths.
Investigate how different types of soil affect plant growth.
Study how erosion changes landscapes.
Test how salt affects soil moisture.
Investigate how plants grow in sandy and clay soils.
Measure how sunlight affects soil temperature.
Study how soil moisture affects plant growth.
Investigate how different materials affect water runoff.

Astronomy

Study how the moon affects the tides.
Investigate how craters form on the moon.
Measure how long it takes sunlight to reach Earth.
Study how different planets move around the sun.
Observe how the stars change position through the year.
Test how different surfaces affect the reflection of light.
Study how the Earth’s rotation affects day and night.
Investigate how planets differ in size and composition.
Study how a telescope works.
Explore how the sun’s energy affects Earth.

Technology

Build a simple robot and test how it moves.
Study how different shapes of paper airplanes fly.
Test how materials affect the speed of a car.
Investigate how different gears affect speed.
Study how a pulley system can lift objects.
Build a simple bridge and test how much weight it can hold.
Test how different materials affect sound in a speaker.
Investigate how simple machines make work easier.
Build a simple electrical circuit and test how it works.
Study how wind turbines generate electricity.

Health Science

Study how handwashing prevents the spread of germs.
Test how different foods affect your energy.
Investigate how exercise affects heart rate.
Study how different sleep patterns affect focus.
Test how water affects your body’s hydration.
Investigate how stress affects the body.
Study how vitamins and minerals affect health.
Measure how the weather affects your mood.
Investigate how sugar affects your teeth.
Study how different foods affect digestion.

Botany

Study how sunlight affects plant growth.
Test how different soils affect plant health.
Investigate how plants adapt to different environments.
Study how plants spread their seeds.
Test how different types of water affect plants.
Investigate how plant roots grow in soil.
Study how pollination works in flowers.
Test how temperature affects plant growth.
Study how plants help improve the air.
Investigate how plants change during different seasons.

Zoology

Study how animals use camouflage to hide.
Investigate how animals communicate with each other.
Test how animals react to changes in temperature.
Study how animals adapt to their environment.
Investigate how animals find food in the wild.
Study how animals sleep and rest.
Investigate how animals interact in groups.
Study how animals care for their young.
Test how animals react to new smells.
Study how animals build shelters.

Geography & Climate

Investigate how different climates affect plant growth.
Study the relationship between latitude and temperature.
Measure rainfall in different regions.
Investigate how winds affect local climates.
Study the effects of climate change on weather.
Explore how natural disasters shape landscapes.
Study how cities change the climate.
Investigate how altitude affects temperature.
Study how water bodies affect nearby weather.
Investigate how geography affects storm patterns.

Electricity & Magnetism

Build a simple electric circuit.
Test how wire thickness affects electricity flow.
Study how magnets affect metal objects.
Build an electromagnet and test its strength.
Investigate how different batteries power a motor.
Build a simple generator.
Test how different materials affect electrical resistance.
Study how magnets work with other magnets.
Test how temperature affects electrical resistance.
Build a small electric motor.

Marine Science

Study how salt affects plant growth in water.
Investigate the impact of pollution on marine life.
Study the role of coral reefs in the ocean.
Explore how ocean currents affect fish movement.
Study how temperature changes affect ocean life.
Investigate how ocean acidification affects shellfish.
Measure how oil spills affect ocean water.
Study the different types of ocean ecosystems.
Test how plastic pollution harms marine life.
Investigate how sea plants help oxygenate the water.

Meteorology

Study how clouds form and what they mean.
Build a simple weather station.
Study how hurricanes develop.
Investigate how wind affects cloud movement.
Test how pressure affects weather.
Create a weather map and predict local weather.
Study how solar energy impacts weather.
Investigate how the jet stream affects weather.
Study how ocean temperatures affect hurricanes.
Measure how seasons affect the weather.

Forensic Science

Study how fingerprints are used for identification.
Investigate how DNA helps solve crimes.
Study blood spatter patterns.
Investigate how footprints are used in investigations.
Study how fibers help solve crimes.
Investigate how gunshot residue is detected.
Study how soil samples are used in investigations.
Investigate how decay helps estimate time of death.
Study how chromatography is used in forensics.
Investigate how evidence is collected in a crime scene.

Genetics

Study how traits are passed in pea plants.
Investigate how mutations change gene expression.
Study how genes are inherited in fruit flies.
Investigate how genetic variation affects populations.
Study how the environment impacts gene expression.
Investigate how selective breeding works.
Study how genetic disorders are passed down.
Investigate the ethics of cloning.
Study how genetic markers help predict diseases.
Test how gene editing changes plant growth.

Social Sciences

Study how culture affects behavior.
Investigate how social media changes communication.
Study how people make group decisions.
Investigate how stereotypes affect people’s actions.
Study how traditions change over time.
Investigate how family roles differ in cultures.
Study how geography affects local economies.
Investigate how language changes in different regions.
Study how immigration affects society.
Investigate how laws influence social behavior.

Psychology

Study how memory works.
Investigate how emotions affect behavior.
Study how people learn new skills.
Investigate how peer pressure affects decisions.
Study how stress impacts the brain.
Test how sleep affects mood.
Study how attention changes with distractions.
Investigate how people form opinions.
Study how self-esteem influences behavior.
Investigate how cognitive biases impact decisions.

Engineering

Design a bridge and test its strength.
Build a simple machine to lift an object.
Investigate how different materials affect construction.
Study how gears work to transfer motion.
Test how air resistance affects objects in motion.
Investigate how the size of wheels affects speed.
Study how levers work to lift heavy objects.
Test how different materials affect heat conduction.
Investigate how pulleys help lift heavy objects.
Study how inclined planes help move objects.

Economics

Study how supply and demand affect prices.
Investigate how inflation affects the economy.
Study how saving money impacts financial stability.
Investigate how taxes affect people’s spending.
Study how trade benefits countries.
Investigate how banks help the economy grow.
Study how interest rates affect loans.
Investigate how advertising influences consumer behavior.
Study how government policies affect businesses.
Investigate how the stock market works.

Anthropology

Study how early humans lived.
Investigate how tools were used in ancient cultures.
Study how language helps people communicate.
Investigate how ancient cultures communicated through art.
Study how families differ across cultures.
Investigate how food affects culture.
Study how cultural practices differ in different parts of the world.
Investigate how beliefs shape society.
Study how clothing styles reflect culture.
Investigate how migration affects culture.

Why Science Projects Matter in 7th Grade

Here are the reasons why science projects matter in 7th grade:

Encourages Curiosity: Science projects help 7th graders explore new ideas.
Teaches Problem-Solving: Students learn how to find answers by testing ideas.
Develops Critical Thinking: Students think about why things happen in their experiments.
Boosts Creativity: Science projects let students come up with new ideas.
Improves Research Skills: Students practice finding and using information.
Builds Confidence: Finishing a project makes students feel proud.
Prepares for Future Classes: Science projects help with learning in future science classes.
Teaches Teamwork: Working together helps students learn how to collaborate.
Improves Communication: Students practice explaining their ideas clearly.
Makes Science Fun: Hands-on projects make science more exciting.

How to Choose the Right Science Fair Project?

Here are the best steps to choose the right science fair project:

Pick What You Like: Choose a topic that interests you.
Learn Something New: Pick a project that helps you explore new ideas.
Check the Supplies: Make sure you have everything you need.
Choose Something Manageable: Pick a project that fits your time and skills.
Look at Your Resources: See if you have enough space and help.
Pick Easy to Explain: Choose a project you can talk about easily.
Try Hands-On Projects: Hands-on experiments are often more fun.
Ask for Help: Get advice from your teacher or family.
Make Sure It’s Science: Choose a project with clear science.
Have Fun: Pick something exciting to enjoy the process!

Science Fair Project Ideas for 7th Grade

Here are some of the best science fair project ideas for 7th grade:

Keep It Simple: Explain your project clearly.
Be Organized: Follow a clear order – intro, experiment, results, conclusion.
Use Visuals: Show pictures or charts to help explain.
Practice: Go over your presentation to feel ready.
Speak Slowly: Talk at a pace everyone can follow.
Stay on Topic: Stick to the main points.
Be Excited: Show that you like your project.
Use Easy Words: Keep the language simple and clear.
Engage the Audience: Ask questions or share fun facts.
Stay Calm: Take deep breaths and relax.

How to Make a Hypothesis and Test It?

Here are the best ways to make a hypothesis and test it:

Make a Guess: Think about what you want to test and make an educated guess about the outcome. This is your hypothesis.
Ask a Question: Start with a question you want to answer. For example, “What happens if I use more sunlight on plants?”
State Your Hypothesis: Write your guess in a simple sentence. For example, “I think plants with more sunlight will grow taller.”
Test Your Hypothesis: Set up an experiment to test it. Make sure to control all factors except the one you’re testing.
Collect Data: Measure and record what happens during your experiment.
Look at the Results: See if your guess was correct.
Conclusion: Say if your guess was right or wrong, and explain why.

Safety Tips for Science Experiments

Here are the safety tipes for science experiements:

Wear Safety Gear: Use goggles and gloves.
Follow Instructions: Read the steps.
Keep Area Clean: Keep your space neat.
Be Careful with Chemicals: Handle chemicals carefully.
Use Tools Safely: Be careful with sharp objects.
Work in a Safe Area: Ensure good airflow.
Know Emergency Steps: Know where the first-aid kit is.
Ask for Help: Ask an adult if unsure.
Clean Up: Clean up after the experiment.
Stay Focused: Focus on your work.

Common Mistakes to Avoid in Science Projects

Here are the common mistakes to avoid in science projects:

Not Planning Ahead: Start early and make a clear plan.
Skipping Research: Always do some research before starting.
Ignoring Safety: Don’t forget to follow safety rules.
Not Measuring Carefully: Be precise with measurements.
Rushing Through the Experiment: Take your time to do it right.
Not Recording Data: Write down everything you observe.
Not Asking for Help: Ask for help if you’re unsure about something.
Using Wrong Materials: Make sure you have the right supplies.
Not Following Instructions: Stick to the steps in the instructions.
Forgetting to Clean Up: Always clean up after the experiment.

Science Fair Project Ideas for 7th Grade Easy

Here are some easy science fair ideas for 7th grade:

Which Sugar Makes Bigger Bubbles?

Test: Which sugar makes the biggest bubbles?
Materials: Sugar, dish soap, water, straw.

Does Music Help Plants Grow?

Test: Does music help plants grow faster?
Materials: Plants, music, pots, water.

Which Balloon Moves Faster?

Test: Does a cold or warm balloon move faster?
Materials: Balloons, water (hot and cold), stopwatch.

Which Toothpaste Works Best?

Test: Which toothpaste cleans better?
Materials: Toothpaste, toothbrush, eggshells.

Which Paper Soaks Up More Water?

Test: Which paper absorbs the most water?
Materials: Different papers, water.

Does Salt Water Freeze Faster?

Test: Does salt water freeze faster than regular water?
Materials: Salt, water, freezer.

Which Surface Makes a Car Go Faster?

Test: Does a smooth or rough surface make a car go faster?
Materials: Toy car, different surfaces, stopwatch.

Does More Water Help Seeds Grow?

Test: Do seeds grow better with more or less water?
Materials: Seeds, water, pots, soil.

Which Material Keeps Ice from Melting?

Test: Does cotton, wool, or foil keep ice from melting?
Materials: Ice, materials, timer.

How Does Exercise Affect Your Heart Rate?

Test: How does exercise change your heart rate?
Materials: Stopwatch, heart rate monitor.

These ideas are simple and easy for 7th-grade science fairs!

Last Minute Science Fair Projects for 7th Grade

Here are some super simple last-minute science fair project ideas for 7th grade:

Water and Plant Growth

Test: Which water makes plants grow best?
Materials: Plants, water, pots.

Balloon Bounce

Test: Which shape of balloon bounces higher?
Materials: Balloons, measuring tape.

Paper Airplanes

Test: Which paper airplane flies the farthest?
Materials: Paper, measuring tape.

Melting Ice

Test: Does ice melt faster in hot or cold?
Materials: Ice cubes, water, timer.

Bouncing Balls

Test: Which surface makes a ball bounce highest?
Materials: Ball, different surfaces.

Salt and Ice

Test: Which salt melts ice faster?
Materials: Ice, salt, timer.

Balloon Size

Test: Does a small or large balloon pop sooner?
Materials: Balloons, stopwatch.

Color and Heat

Test: Does dark or light color heat up faster?
Materials: Objects of different colors, thermometer.

Freezing Liquids

Test: Which liquid freezes the fastest?
Materials: Juice, soda, water, freezer.

Straw Speed

Test: Does juice or water go through a straw faster?
Materials: Straw, liquids.

These projects are easy to do in a short time!

Science Fair Project Ideas for 7th Grade Biology

Here are some simple 7th grade biology science fair project ideas:

How Light Affects Plant Growth

Test: Does more light help plants grow faster?
Materials: Plants, lights, pots, soil

Best Soil for Plant Growth

Test: Which soil helps plants grow best?
Materials: Different soils, plants, pots

Effect of Temperature on Frogs

Test: Does temperature change frog behavior?
Materials: Frogs, containers, temperature controls

Does Music Help Plants Grow?

Test: Do plants grow better with music?
Materials: Plants, speakers, music

Best Water for Fish

Test: Does tap or filtered water work better for fish?
Materials: Fish, water, tanks

Different Materials for Plant Growth

Test: Does cloth, plastic, or paper affect plant growth?
Materials: Plants, materials, pots, soil

Plants Without Water

Test: How long can plants live without water?
Materials: Plants, no water

Sugar Water and Plants

Test: Does sugar water help or hurt plants?
Materials: Plants, sugar, water

Insects and Plants

Test: Do insects help or harm plants?
Materials: Plants, insects, pots, soil

How Germs Spread

Test: How do germs spread around the house or classroom?
Materials: Germ powder or gel, surfaces, hand sanitizer

These easy biology projects will help you learn more about plants, animals, and germs!

7th Grade Science Project Ideas With Food

Here are some simple 7th grade science project ideas with food:

Which Milk Froths Best?

Test: Which milk makes the best foam?
Materials: Different types of milk, frother or whisk

How Temperature Affects Yeast

Test: Does yeast grow faster in hot or cold water?
Materials: Yeast, warm and cold water, sugar

Best Fruit for Juice

Test: Which fruit makes the most juice?
Materials: Different fruits, juicer

Salt and Ice Melting

Test: Does salt make ice melt faster?
Materials: Ice, salt, timer

Sugar and Boiling Water

Test: Does sugar change the boiling point of water?
Materials: Water, sugar, pot, thermometer

Which Fruit Ripens Fastest?

Test: Which fruit ripens the quickest?
Materials: Different fruits, paper bags

Food Coloring and Taste

Test: Does food coloring change the taste of food?
Materials: Food, food coloring, blindfold

Baking Soda in Pancakes

Test: Does more baking soda make pancakes fluffier?
Materials: Pancake mix, baking soda, griddle

Brown vs. White Sugar in Cookies

Test: How do brown and white sugar affect cookies?
Materials: Cookie dough ingredients, brown sugar, white sugar

Best Fruit for Natural Soda

Test: Which fruit makes the best fizzy drink?
Materials: Fruit juice, yeast, sugar, bottle

These simple projects will help you explore how food works in fun ways!

Environmental Science Fair Projects for 7th Grade

Here are some easy environmental science fair project ideas for 7th grade:

Recycling and Plant Growth

Test: Does using recycled paper help plants grow?
Materials: Recycled paper, seeds, soil, pots

Water Pollution and Plant Health

Test: How does dirty water affect plants?
Materials: Clean and dirty water, plants, pots

Energy Saving Light Bulbs

Test: Do energy-saving light bulbs use less energy?
Materials: Regular and LED light bulbs, energy meter, timer

Solar Power Water Heating

Test: Does solar power heat water faster than other methods?
Materials: Solar panel, water, thermometer, container

Decomposing Trash

Test: How long does it take trash to break down?
Materials: Food scraps, plastic, paper, containers, soil

Air Pollution and Plants

Test: How does air pollution affect plants?
Materials: Plants, smoke or fan, pots

Renewable Energy

Test: Which renewable energy source works best?
Materials: Solar panel, wind turbine, small fan or light bulb

Water Conservation

Test: Which way of watering plants saves the most water?
Materials: Different watering methods, plants, soil

Plastic Pollution in Water

Test: How does plastic affect water life?
Materials: Plastic items, water, fish or plants

Composting vs. Landfill Waste

Test: Does composting break down waste faster than landfill?
Materials: Organic waste, plastic waste, containers, soil

These projects will help you learn about the environment and how we can help protect it!

7th Grade Science Fair Projects With Independent And Dependent

Here are some 7th grade science fair project ideas with clear independent and dependent variables:

Plant Growth and Light

Independent: Type of light (e.g., natural, fluorescent, LED)
Dependent: Plant growth (height, number of leaves)

Water Filter

Independent: Type of filter material (sand, charcoal, cotton)
Dependent: Water clarity or cleanliness

Magnet Strength

Independent: Number of magnets used
Dependent: Number of paperclips picked up

Egg Drop

Independent: Type of protective material (bubble wrap, cotton, foam)
Dependent: Whether the egg breaks or survives

Volcano Eruption

Independent: Amount of baking soda
Dependent: Size/height of the eruption

Freezing Water

Independent: Amount of sugar added to water
Dependent: Time it takes for the water to freeze

Paper Airplanes

Independent: Plane design (e.g., short, long, wide)
Dependent: Distance flown by the plane

Solar Power

Independent: Material used for the solar panel (black, white, foil)
Dependent: Amount of energy produced

Invisible Ink

Independent: Type of invisible ink (lemon juice, baking soda)
Dependent: Clarity or visibility of the message when heated

Static Electricity

Independent: Type of material rubbed on the balloon (wool, cotton)
Dependent: Amount of paper attracted by the balloon

These projects are simple to set up, with one thing changing (independent) and another thing being measured (dependent).

Conclusion

In conclusion, science fair projects for 7th grade are a fun way to explore science and learn new things. These projects help you build important skills like problem-solving and thinking creatively.

Whether you are growing plants, testing water filters, or playing with static electricity, you’ll learn how to ask questions, make guesses, and look at results. Choose a project that interests you—it’ll make everything more exciting.

Remember to keep track of your variables and have fun while learning. Science is about curiosity, and your project is a great chance to discover new ideas and share them!