Noob needs help with calculating efficiency

[Rexorotten]

Brewed my first AG BIAB batch tonight. Biermuncher's cream of 3 crops

final volume: 5.5 gallons
6 lbs 2 row
2 lbs flaked corn
approx. 1 lb minute rice.

My kettle wasn't large enough to do no sparge so I dunk sparged in 2.5 gallons of water after mash. Original volume was 5.5 gallons + 2.5 gallons dunk sparge.

My gravity after mash was 1.042. Gravity after boil was 1.050. I've searched for an efficiency calculator but can't find one that works. Any help appreciated.

 

[Jsuds]

http://beercalculus.hopville.com/recipe

http://www.tastybrew.com/calculators/

 

[Rexorotten]

Thank you!

If I used the calculator correctly, I got around 80% efficiency. I'm not exactly sure how much rice I used. I bought a 1lb 12oz box, and tried to judge, but it was close to a pound erring on the side of caution. BIAB was really easy. Would have been a lot easier if I had a big enough pot to do a no sparge. The hardest part was getting the sparge water up to temp by the time the mash was done. Wort smelled great, and I can't wait to try it in a few weeks.