Distance Measurement
Measure 2D straight-line distance between two draggable points on your screen.
Euclidean Distance Principles
Straight-line distance d is derived from the hypotenuse of the right triangle formed by horizontal ΔX and vertical ΔY.
When calibrated, screen distances convert directly to real-world millimeters or inches with 1:1 hardware accuracy.
Useful for web designers and engineers verifying layout padding, element margins, and pixel-perfect UI spacing.
Need to measure surface areas? Check our Area Measurement Tool, test vector angles with the 3-Point Angle Tool, or use the Online Ruler.
Frequently Asked Questions About Distance Measurement
Common questions regarding Euclidean math, screen pixels, and coordinate geometry.
How is 2D distance calculated?▼
2D distance uses the Euclidean distance theorem: d = √((x2 - x1)² + (y2 - y1)²). The tool calculates the direct straight-line distance between Point A and Point B along with horizontal (ΔX) and vertical (ΔY) vector components.
What is the difference between screen pixels and calibrated units?▼
Screen pixels measure the raw CSS pixel coordinate offset rendered by your browser. When you calibrate your screen using a standard credit card, ANRuler applies your display's real-world pixel density to convert pixel distances into physical millimeters, centimeters, or inches.
Can I use arrow keys to adjust point coordinates?▼
Yes. Focus the canvas and press the Arrow keys (Left, Right, Up, Down) to nudge the active measurement point pixel-by-pixel. Hold Shift with arrow keys for 10-pixel increments.