To measure your ring size at home:

METHOD 1. USE A STRING/FLOSS

To measure with a string, you will need the following:

String/Floss
Ruler
Pen/Marker

How to measure:

Cut a string that is about 6 inches long.
Fold the string around the base of the finger, just below the knuckle.
Mark where the string ends with the pen.
Place the measured string on the ruler with the area marked on your right.
The number closest to the pen mark is the circumference of the ring in millimeters.
Use the ring size chart to translate the measurements into a ring size.

METHOD 2. USE A STRIP OF PAPER

To measure the ring size using a strip of paper, you will need the following:

A strip of paper
Ruler
Pen/marker

How to measure:

Cut a thin strip of paper about 100 millimeters long.
Fold the thin strip of paper around the finger at the base and close enough to your knuckle.
Mark the area where the two ends of the paper strip meet.
Use the ruler to measure the length in millimeters to give you the circumference.
Convert the measurement to the appropriate ring size, using the ring size chart.

METHOD 3. USE A RING THAT FITS YOU

To measure the ring size using a ring that fits, you will need the following:

A ring at home that fits the finger that will wear the engagement ring
Ruler

How to measure:

Measure the internal diameter of the ring (that’s the hole inside the ring, excluding the metal).
Write down this measurement in millimeters, and use the conversion chart to find your ring size.