Support free STEM tools
Keep STEM Calculators free for students and teachers
This project is built by a team of teachers as a free calculator and learning resource. A support package helps cover hosting, maintenance, testing, and new classroom-ready calculators.
Hosting
Fast access for students worldwide.
Accuracy
Formula review and calculator testing.
Growth
New topics, explanations, and examples.
Choose a support package
Each option is a one-time PayPal checkout package in USD.
Why this is a checkout package
PayPal Donate is not available for the Albanian business account used for this project, so these packages use PayPal Standard Checkout as a one-time support purchase.
Payment security: All transactions are processed by PayPal. STEM Calculators does not store card details, PayPal account details, or payment credentials. Checkout is managed by PayPal under PayPal terms.