Quantities - guide for red grapes

Thought this might be handy to have as a post - excerpted from one of last week's emails:

• 50 lb grapes produces 5 gallons of crushed grapes requiring 6.5 gallons of primary fermenter volume and produces 3.5 to 4 gallons of finished wine (1.5 cases).
• 100 lb grapes produces 10 galons of crushed grapes requiring 20 gallons of primary fermenter volume and produces 7 to 8 galons of finished wine (3+ cases).
• 200 lb grapes produces 20 gallons of crushed grapes requiring 32 gallons of primary fermenter volume and produces 15 to 16 gallons of finished wine (6 to 7 cases).
• 400 lb grapes produces 40 gallons of crushed grapes requiring 55 gallons of primary fermenter volume and produces 30 to 32 gallons of finished wine (12 to 14 cases).

Source is Sheridan Warrick, The Way to Make Wine, pp. 16.