Check my parallax calculation

[Silvercreek Farmer]

For a 4x28 scope, parallax free at 60 yards, I get a maximum parallax error of 9.8mm at 200 yards. Does this sound right?

[Silvercreek Farmer]

Hmmm, found this calculator that shows 32.7mm, quite a difference from my calculation...

https://www.lelandwest.com/parallax-error-calculator.cfm?Action=1&CFID=1861083&CFTOKEN=aaae8b223fe0ebe0-3F2C6299-FA05-8874-750CF4BED5178387&jsessionid=C408CB80DB5498487707D0E7FD8D8784.cfusio n

[Hogtamer]

silvercreek, I was assured there would be no math on this site!