Embed
a calculator
Prefer a physical calculator?
A few solid picks. As an Amazon Associate, Calculate.to earns from qualifying purchases, at no extra cost to you.
OSALO Desktop Calculator
Extra-large 12-digit LCD, giant buttons, solar + battery, the classic office desk workhorse.
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Helix Oxford Scientific
240-function scientific calculator for KS3–KS4 maths, with hard cover. Exam-friendly, plastic-free packaging.
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Casio fx-83GTCW+
The UK classroom-standard scientific calculator (also in pink), allowed in most UK exams.
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ROATEE Construction Calc
Feet-inch-fraction engineering calculator for carpenters, framers and contractors on site.
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Pick a calculator, copy one line
Choose any tool, set a size, and copy the snippet. It is a plain iframe: no script runs on your page, nothing is tracked, and the widget carries a small "Powered by calculate.to" link back to the full tool, that link is the whole price.
It carries state, too
Every calculator on the site keeps its inputs in the URL, and embeds inherit that. Add your own defaults to the src as query parameters alongside embed=1, for example a loan embed pre-filled with your article's numbers, and the widget opens already showing them. Readers who click through land on the full page with the same numbers loaded.
House rules
Free for any site, commercial or not. Keep the attribution link visible and unmodified, it is how the tools stay free, and please do not wrap the iframe in anything that intercepts its clicks. The widget never sets cookies, never phones home, and works offline once your reader's browser has it cached.