Online Rectangle Measurement: Length & Width
Match the adjustable rectangle to a rectangular object or on-screen area and read its horizontal and vertical dimensions.
Quick Usage
Position the rectangle
Move the rectangle so its starting corner lines up with the corner of the object or area you want to measure.
Adjust each dimension
Change the horizontal and vertical dimensions independently until the rectangle matches the object or area.
Read the result
The tool shows the two measured dimensions in cm, mm, inches, or pixels and updates them as you adjust the shape.
Length and Width
The rectangle tool measures two perpendicular sides independently. Use it when you need the dimensions of a card, box, photo, sheet, screen region, or another rectangular shape.
Measuring a Physical Rectangle
Calibrate the display before using cm, mm, or inches as physical dimensions. Then align the rectangle's corner and two sides with the physical object as closely as practical.
Keep the Rectangle Aligned
The measurement box follows the screen's horizontal and vertical directions. If the physical rectangle is rotated, measure an individual edge with the Line tool or reposition the object before using the rectangle tool.
What Can Affect the Reading
Physical results can be affected by calibration, browser zoom, display scaling, viewing angle, and small alignment errors. Use the rectangle tool for practical checks and verify important dimensions with a suitable physical measuring instrument.
Frequently Asked Questions
長さ、幅、実物の四角形、2D寸法測定に関するよくある質問。