For what it's worth, I caution against the use of the 'Precipitation rate calculator' above. It assumes an area of 1 sq.ft. for each drip emitter and I leads to under-watering your vegetation. I tried using that method and it was frustratingly wrong. It's actually the reason that I created the drip calculator I posted above.
No offense to anyone, but there have been a lot of people that have had a lot of issues with setting up drip due to the 1 sq.ft. assumption.