By Team Edtoolkits · Calculators
A true-size on-screen ruler in centimetres and inches, calibrated by matching a bank card or coin, with a measuring marker and a protractor for angles.
Use the guide alongside the working tool.
Open Online Ruler →Pick the exam and document
Place a bank card (or a coin) on the screen and drag the slider until the dashed outline matches it exactly. Or enter your screen size in inches.
Frame and clean up
Choose centimetres or inches and lay your object along the ruler; tap or drag on it to place a marker and read the length.
Create and check
Switch to the protractor, put the centre dot on the corner, line up the base and drag the red arm to read the angle.
Privacy and limits
Screens do not tell websites their real size, so calibrate once per device and keep the page zoom at 100%. Accuracy depends on how carefully you match the card; for anything critical, use a physical ruler.
Ready to apply this workflow?
Try Online Ruler →Explore a related workflow
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Keep your original files and review the result. Found unclear instructions? Contact Team Edtoolkits.