Make an oven
Build a solar oven from a pizza box, foil, and plastic wrap, then use sunlight to safely melt snacks and explore heat transfer.
Step-by-step guide to make a solar oven
6 EASY DINNER RECIPES FOR KIDS TO HELP YOU MAKE!
Step 1
Gather all the materials listed and set them on a clean table.
Step 2
Close the pizza box and draw a rectangle on the lid leaving a 1-inch border on three sides and keeping one side as a hinge.
Step 3
Cut along the three drawn sides with scissors to make a flap that opens but keeps the hinge side intact.
Step 4
Fold the cut flap upward along the hinge so it stands up like a little mirror.
Step 5
Cut a piece of aluminum foil to fit the underside of the flap.
Step 6
Press the foil shiny-side out onto the underside of the flap and tape the edges so the foil stays smooth and flat.
Step 7
Cut a piece of black construction paper to fit the bottom inside of the box.
Step 8
Tape the black paper flat to the bottom of the box so it covers the inside base.
Step 9
Stretch plastic wrap over the opening created by the flap and tape it all around to make a clear sealed window.
Step 10
Prop the foil flap with a stick or ruler so it reflects sunlight into the plastic-covered window.
Step 11
Place your snack on the small plate or piece of foil and set it on the black paper inside the box.
Step 12
Close the pizza box lid.
Step 13
Put the oven in direct sunlight and tilt the box and flap so the foil reflects the sun’s rays through the plastic window onto the snack.
Step 14
With adult help, open the oven after 20–60 minutes and use oven mitts to carefully remove the warm snack.
Step 15
Take a photo or note of what happened and share your finished solar oven and results on DIY.org.
Final steps
You're almost there! Complete all the steps, bring your creation to life, post it, and conquer the challenge!
Help!?
What can I use instead of a pizza box, aluminum foil, black construction paper, or plastic wrap if I can't find them?
If you don't have a pizza box use a similarly sized shoebox or cereal box and follow the same cutting/hinge steps, replace aluminum foil with a reflective emergency blanket or small mirror taped to the flap, use black cloth or painted cardboard for the bottom, and swap plastic wrap for a clear plastic folder or transparency sheet taped over the opening.
My oven isn't getting hot or the foil flap won't reflect sunlight properly—how can I fix it?
Check that the foil is taped smooth and shiny-side out on the flap (step 6), that the plastic window is sealed all around with tape (step 8), and re-angle the flap and box so the reflected sunlight hits the black paper inside (steps 11–12), adding a second plastic layer or smoothing wrinkles to reduce heat loss.
How can I adapt the activity for different age groups?
For young children have an adult do the cutting and prop the flap (steps 2–4 and 11) while kids tape foil and put snacks in, for elementary kids let them assemble and angle the oven themselves, and for older kids add a thermometer and timed experiments (steps 9–13) for more challenge.
How can we improve or personalize the solar oven after finishing the basic build?
To enhance performance and personalization add insulation like crumpled newspaper around the inside before taping the black paper (step 7), attach an adjustable brace or protractor to fine-tune the foil flap angle (step 11), decorate the outside, and test different snacks and times to document results (step 13).
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Facts about solar energy and heat transfer
☀️ Solar cookers can reach temperatures over 200°F (93°C) using only sunlight on a bright day.
🥪 A pizza-box solar oven can melt s'mores in about 10–30 minutes depending on how sunny it is.
🌡️ Most warming in a solar oven comes from infrared radiation — the same sunlight wavelengths we feel as heat.
🪞Shiny foil helps by reflecting more sunlight into the box, while black surfaces absorb that light and turn it into heat.
♻️ Turning a pizza box into an oven is a great upcycling trick—reusing materials saves waste and teaches engineering!
