Last updated: August 19, 2026
CalculatorsGuide is committed to being usable by everyone, including people who browse with a keyboard only, a screen reader, magnification, high-contrast settings, or reduced motion. This statement explains what we have done, what we have tested, what we know is imperfect, and how to tell us when something does not work for you.
Conformance target
We aim to meet WCAG 2.1 Level AA. Based on our own testing we believe the site substantially conforms, and we treat any gap we find or that is reported to us as a defect to be fixed. We have not commissioned an independent third-party audit, so we describe this as substantial conformance rather than certified conformance.
What we have built in
- Full keyboard operation. Every calculator, tab, menu, disclosure and link can be reached and operated with Tab, Shift+Tab, Enter, Space, arrow keys and Escape. Nothing requires a mouse or a pointer.
- Visible focus. A high-contrast focus ring marks the element you are on, and it is never removed.
- Skip link. A “Skip to main content” link is the first thing keyboard and screen-reader users reach, so navigation can be bypassed.
- Real labels. Every input has a visible, permanently associated label — we never rely on placeholder text as a label, because it disappears the moment you type.
- Results are announced. Result panels are live regions, so a screen reader reads the answer when a calculation completes rather than leaving the user to hunt for it.
- Errors are text, not colour. Invalid input produces a written explanation of the rule that was broken, announced as an alert — never a red border alone.
- Contrast. Text and interface colours meet or exceed WCAG AA contrast ratios in both the light and dark themes.
- Dark mode and system preference. The site follows your operating-system light/dark setting and offers a manual toggle that is remembered.
- Reduced motion. If your system requests reduced motion, animations and smooth scrolling are switched off.
- Zoom and reflow. Pages reflow without horizontal scrolling at 320 px width and remain usable at 200% zoom and above.
- Semantic structure. Landmarks, one H1 per page and a logical heading order make the page navigable by region and by heading.
- No time limits, no flashing. Nothing expires, auto-refreshes, auto-plays, or flashes.
- Meaningful non-text content. Decorative icons are hidden from assistive technology; anything that carries meaning is available as text.
- Text, not pictures of text. Formulas, worked steps and tables are real HTML text, so they can be magnified, restyled, copied and read aloud.
How we test
Every release runs an automated accessibility audit across the site, which currently reports a perfect score on the pages we sample, and our automated browser tests check keyboard operation, focus behaviour, error messaging and layout at mobile widths. Automated tools cannot catch everything, so we also review new calculators manually with keyboard-only navigation. All 33 calculators are covered by these checks.
Known limitations
We would rather name these than imply perfection:
- Wide reference tables scroll horizontally on very narrow screens. The data is still reachable, but it requires sideways scrolling.
- The matrix calculator presents a grid of many small inputs. Each cell is individually labelled by row and column, but working through a 5×5 grid with a screen reader is inherently laborious.
- Third-party advertising, once enabled, is delivered by an external provider whose markup we do not control and cannot guarantee for accessibility.
- Mathematical notation is written as plain text (for example
√48 = 4√3) rather than MathML. This reads reliably in most screen readers but is not semantically marked up as mathematics.
Tell us about a barrier
If any part of this site is difficult or impossible for you to use, please email contact@calculatorsguide.com and describe what you were trying to do, which page you were on, and the assistive technology, browser and operating system you were using. We treat accessibility reports as bugs: we investigate, fix what we can, and add a test so the problem cannot return. We aim to respond within five working days.
Alternative access
If a calculator is not usable for you, email us with the numbers you need calculated and we will reply with the result and the working. Nothing on this site is behind a sign-up, and every calculation runs in your own browser.