To calculate the price of your job, take the cost of the type of Spray Foam you choose:
Open-cell Spray Foam cost is generally 0,35 to 0,55 cents per board foot
Closed-cell Spray Foam cost is generally $ 0.90 – $1.00 per board foot

For example,

2,500 sq ft, At 2″ thick of closed cell = $4,750. to $6,000
2,500 sq ft, At 4″ thick of open cell = $4,000. to $6,500

Minimum Service Charge Per Job is $2.100 To $2.500. Depending on Your Job and Situation.