Why do mis-taps happen?
In mobile UI, buttons that are too small or packed too closely together make it hard for a finger to hit exactly the one you meant to tap. As a general rule, a touch target of at least 44px with at least 8px of spacing keeps most users tapping reliably. The further your design drifts from that baseline, the higher the chance of accidentally tapping a neighboring button.
Enter your button's width, height, and gap, and this calculator estimates the mis-tap rate based on how far you are from the recommended standard, then rates it Safe, Caution, or Risky. It's a design-review reference rather than precise experimental data, so pair it with real usability testing before shipping.
Frequently Asked Questions
It's a reference estimate based on how far your button size and spacing fall short of the recommended 44px size and 8px gap — actual usability test results may differ.
More gap reduces mis-taps, but if the button itself is under 44px the underlying risk remains — you need to increase size too.