Split reins are measured from bit-end to end, including popper if present. The length you need depends on the size of the horse, the length of the neck and personal preference.
Size
Measurement in meters
Measurement in inches
Recommended for:
W-XS
1,60m
5ft3"
small pony
W-S
1,80m
5ft10"
pony size
W-M
2m
6ft25"
small horse or cob
W-L
2,25m
7ft4"
full size
W-XL
2,5m
8ft2"
large horses,
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