Place a real credit, debit, or ID card flat on the dotted strip below, then drag the right edge until the on-screen card matches your real card's width exactly.
KBT MeasureCARD 85.6 MMCalibration card54 mm
Width: 324 px= 85.6 mm= 3.785 px/mm= 96.2 DPI
Status: Using default 96 DPI (uncalibrated)
Tip: if the on-screen ruler doesn't match a real ruler, recalibrate with your card. Keep browser zoom at 100% or the scale will be off.
Ruler
Drag A / B
A
B
Measure an object
Rest a small object on the ruler above, then drag markers A and B to its two edges. Its real size shows below — ideal for a screw, SIM card, ring, bead, or photo when no physical ruler is handy.
Measured size50.0 mm5.00 cm1.97 in
Switch the ruler to Horizontal to use the measure markers.