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BestExperimentIdeas

Science fair guide

Find a science fair project — and present it like a scientist

Pick a project that fits your grade, subject and the time you have left, run it properly, then build a board and report that tell the same story: here's what I asked, here's what I measured, here's what the data says.

Find a science fair projectHow to choose a project

Science fair projects that fit you

Choose a level, a subject or a difficulty and see real projects from the library — each with materials, cost, time, safety notes and a data table.

Finding projects…

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How to choose a science fair project

Start from a question, not a demo

A volcano that always erupts the same way has nothing to measure. Ask something with an answer you don't already know: does X change Y, and by how much?

Check the calendar before the topic

Plant growth and mould projects need weeks; a physics or engineering test can be done in an afternoon. Work backwards from your fair date and leave room to repeat a trial.

Make sure you can measure it

You need a number you can put in a table — distance, time, temperature, mass, count. If the only result is "it looked cooler", pick a different project.

Match the level and the safety

Every project here lists its cost, time, hazards and whether adult supervision is needed, so you can rule a project in or out before buying anything.

From question to results

The project workspace walks you through these in order and keeps your writing and data together, ready to print.

  1. Step 1

    Research question

    One sentence, specific and testable: "Does the amount of salt in water change how quickly it freezes?" Narrow beats broad every time.

  2. Step 2

    Hypothesis

    Written before you test, in the form: if I change this, then that will happen, because of this reason. Being wrong is fine — being vague is not.

  3. Step 3

    Variables

    One independent variable you change, one dependent variable you measure, and a written list of everything you hold constant. Each project page states all three.

  4. Step 4

    Procedure

    Numbered steps detailed enough that a stranger could repeat your experiment exactly, plus at least three trials at every setting.

  5. Step 5

    Data collection

    Fill in the project's data table as you go, with units in the column headings. Record surprises and mistakes — judges reward honesty about them.

  6. Step 6

    Results and analysis

    Average your trials, graph the trend, and say plainly what the numbers show and where the error came from before you write the conclusion.

Display board layout

Left panel

  • Question
  • Background research
  • Hypothesis
  • Variables

Center panel

  • Project title
  • Photo of your setup
  • Graph of results
  • Data table

Right panel

  • Results in words
  • Conclusion
  • What I'd improve
  • Sources

Report structure

  1. 1

    Title page

    Project title, your name, grade and teacher.

  2. 2

    Question

    One clear, testable question.

  3. 3

    Background

    What you learned before testing, in your own words.

  4. 4

    Hypothesis

    If… then… because… — written before you experiment.

  5. 5

    Materials & procedure

    Detailed enough for someone else to repeat exactly.

  6. 6

    Results

    Your data table plus a graph, with units labelled.

  7. 7

    Conclusion

    Was the hypothesis supported? What does the data actually show?

  8. 8

    Improvements

    Sources of error and what you'd change next time.

Every project workspace generates this report from your own writing and data, ready to print.

Scientist perk

Science fair export pack

A Scientist membership turns your workspace into a judges-ready document. The pack is built only from what you actually wrote and measured — nothing is invented.

Project report

A complete write-up with your question, hypothesis, procedure, results, conclusion and sources.

Materials checklist

Every supply and tool listed, with checkboxes so you can track what you have left to buy.

Display board layout

A printable guide showing where each section goes on a standard three-panel board.

PDF ready

Export as an HTML file, open in any browser, and print or save to PDF exactly as it appears.

Unlock with Scientist Start a free project

Questions judges ask

  • Why did you choose this question?
  • What was your independent variable and how did you control the others?
  • How many trials did you run, and why that many?
  • What does your graph show that a table wouldn't?
  • What surprised you about the results?
  • If you had another month, what would you test next?

Ready to build your project?

Answer a few questions and get a full plan, data table and report outline.

Find my experiment

Find project ideas by subject and level

Every collection lists materials, cost, time, safety notes and the variables to control — the things a judge asks about.