Measure your finger using an everyday object.

What will you use?
Random Credit Card

Credit Card

53.98 x 85.60mm
Business Card

Business Card

55.00 x 85.00mm
Usb Type A

Usb Type A

12.00 x 12.00mm
Battery Type AAA

Battery AAA

10.50 x 44.5mm

Use the - and + button to fit your Credit Card in the box.

Credit Card Sample
Business Card Template
Usb Type A Template
Battery aaa Template

Drag the pulsing circle to fit your Finger in the caliper.

Your size is
14.00 mm
Apply size to TFOJ