Custom Calculators
Need a calculator that does exactly what your unit covers? Tell us the inputs and outputs you need. We build calculators for educators at no cost, from simple graders to specialized chemistry, physics, and statistics tools.
Built for Classrooms, Free for Teachers
If you teach math, science, or anything quantitative, here is what we can do for you.
Why We Care About Educators
Teachers spend a lot of time hunting for resources and explaining concepts in different ways until something clicks. We built VastCalc to be one less thing on that pile: a free, accurate, always-available reference students can use during class, on homework, or when they are stuck at the kitchen table at 9pm.
Every calculator we publish is free, ad-light, and works without an account. We do not hide content behind paywalls, we do not sell data, and we do not collect anything we do not need. That is deliberate. We think education tools should remove barriers, not add them.
If you teach math, science, or anything quantitative, we want to hear from you. The best way to make VastCalc more useful for classrooms is to learn what classrooms actually need.
How We Can Help
Free for educators. If we can help, we will.
Embed Anywhere
Drop any of our calculators into your classroom website or other digital materials with a short code snippet. Our embeds are responsive, free, and continuously updated, so students can immediately use the same tool from wherever you post the link.
Curriculum Collections
Tell us what you teach and we'll put together a curated list of relevant calculators. Geometry, Algebra II, AP Physics, intro statistics. Whatever the unit, we'll match it to the right tools.
Fast Responses
Educators get priority. If you spot a bug, want a feature, or need help explaining how a calculator works in class, email us. We answer fast and are happy to help.
Get in Touch
Drop us a note about what you teach, what you need, or what would make VastCalc more useful in your classroom. We respond to every educator email.
Contact Us