Quinte Fishing

Pi(spool diameter)(ratio)
As said, depends on the ratio and spool diameter as mathematically the line reeled in per one revolution of the handle changes with either. The line diameter will make the spool diameter change more apparent as line is added or subtracted from the spool and the amount of line per turn will vary accordingly.

But for an example:
Full Spool diameter=1.25"
ratio = 5:1

therfore
3.1416(1.25)(5)=19.635"
If you want the decimal portion of the inches in 1/16 of an inch multiply it by 16 and add the inches
19+0.635/16 =19 10/16" or better said 19 5/8"

If you want feet, divide the inch decimal from above by 12
19.635/12 = 1.63625'
If you want feet and inches, multiply the decimal portion by 12 and add to your feet
1' + 0.635625(12) = 1'-7.6275"
If you want the decimal portion of the inches in 1/16 of an inch multiply it by 16 and add to your feet and inches
1'-7"+0.6275(16) = 1'-7 10/16" or better said as 1'-7 5/8"

Of course we are a metric country after all:
For example:
Full Spool diameter=30mm
ratio = 5:1

therfore
3.1416(30)(5)=471.24mm

...or just do what hookingeyes said and measure it.

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HUNT, FISH and RIDE