Windows Azure platform gives you the flexibility to pick services and offers based on your business needs. Now, to help you select the right Windows Azure platform offer and estimate your monthly costs, Microsoft just launched a new "pricing calculator."
"The pricing calculator lets you pick compute, database, storage, bandwidth, CDN and Service Bus capacity based on your needs. Along with predicting your expected monthly costs, the pricing calculator then recommends the most cost effective offer for you to purchase Windows Azure platform services."
You can access the pricing calculator here.
[Source: Windows Azure team blog]