Casio's fx-300ES PLUS calculator is now free online — no hardware needed
Casio's fx-300ES PLUS — one of the most common scientific calculators in US classrooms — is now available for free in any browser. The emulator launched July 14, 2026 on ClassPad.net and requires no download or separate registration. For students who previously had to spend around $15 on the physical unit, that barrier is now gone.
The calculator, digitized
The online version is a full replica of the physical fx-300ES PLUS, not a stripped-down alternative. Every function of the hardware is present, and Casio added several features designed specifically for classroom use.
Natural Textbook Display renders fractions, square roots, and other expressions the way they appear in textbooks and on standardized tests — a key reason the fx-300ES line became a fixture in K-12 math and science. A new Key Log feature shows the sequence of keystrokes used to reach an answer, which helps students follow and review each step of a calculation. There's also a projection mode that scales the calculator interface up for display on a smartboard or projector, and a screenshot tool for saving or comparing work.
Logging in takes seconds: the emulator accepts existing Google, Google Classroom, Microsoft, or Clever accounts — the same sign-in options already used in most US schools. That Google Classroom and Clever integration in particular points squarely at K-12 adoption.
Free online, still $15 in stores
The physical fx-300ES PLUS remains on sale at roughly $15, and Casio hasn't signaled any plans to discontinue it. Schools that need physical units can still contact Casio about education pricing. But the free emulator changes the calculus for individual students and teachers who just need the functionality without the hardware.
The physical Casio fx-300ES PLUS retails for around $15 in the US.
The move mirrors what Desmos and GeoGebra have done with graphing and geometry tools — offer browser-first access to pull users into an ecosystem. Casio's differentiator is brand familiarity: the fx-300ES is already the calculator many students are required to own, so a free digital version of the exact same tool has an obvious path into classrooms. Whether that translates to meaningful adoption outside the US — where ClassPad.net's rollout timeline remains unconfirmed — is still an open question.
