Andy's IBU Calculator
This IBU calculator is my first real php application. The site uses php for a number of simple things, but this is the first real use. Let me know if you find some inconsistencies.Inspiration comes from DJMeyer's java applet which I'm no longer content with (this is 90 IBU?).
I wanted to be more accurate with the calculations, so I picked Jakie Rager's IBU formula, which calculates Hop Utilization dependent upon specific gravity, boil time, and hop type. Its more appropriate for partial wort boils. If you're doing a full wort boil, try Glenn's below.
Jackie Rager's Equation
Glenn Tinseth's Equation
Here's a second function that calculates the IBU using Glenn Tinseth's equation, which is more useful for full wort boils. This formula and numbers are for whole cones which have a different utilization than do oils and pellets. But there are plenty of other factors that affect utilization as well, so this gives you a decent picture about what your IBUs will be.