Distance Formula Calculator

Distance Formula Calculator finds the straight-line distance between two points, in two or three dimensions. The formula is Pythagoras applied to coordinates: square the change in each direction, add them, take the square root.

The working is printed step by step because the formula is one people are asked to reproduce rather than just use. Seeing the differences, then the squares, then the sum, then the root makes it clear why the order matters and why a sign error in the differences does not affect the answer -- the squaring removes it.

The midpoint and the slope come free from the same two points and are usually wanted alongside the distance, so they are shown rather than requiring a second tool. A vertical line is reported as vertical rather than as infinity, because that is what an undefined slope means.

The page shows its working, not just its answer. Where there is a formula it is printed with your own numbers substituted in, so you can check the result rather than take it on trust -- which is the difference between a calculator you can use for something that matters and one you cannot.

Everything runs inside your browser. What you type is never uploaded, never logged and never stored, and the calculator keeps working if your connection drops after the page has loaded.

• Shows distance, change in x, change in y, midpoint and slope together, so you are not running it twice
• Prints the formula with your own figures substituted in
• Updates as you type, with no button to press and no page reload
• Copy the result in one click
• Free, no sign-up, and it runs entirely in your browser

The distance formula calculator is used by writers, developers, students, marketers and anyone else who needs the job done once without installing software. Common cases include:

• Finding the distance between two coordinates
• Checking a distance formula answer in homework
• Measuring a diagonal from grid references
• Working in three dimensions for a CAD or physics problem