Please use decimal equivalents of joint dimensions, the calculator will not accept fractions.

Decimal Conversion
1/8 = .125
3/16 = .1875
1/4 = .25
5/16 = .3125
3/8 = .375
1/2 = .5
5/8 = .625
3/4 = .75
7/8 = .875

For example, a 3/16″ x 1-3/4″ joint would be .1875″ x 1.75″