Use these design tools to assist you in sizing your network:
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IPC Tools
http://tools.cisco.com/partner/ipccal/index.htm
The IPC Tools, such as the IPC Resource Calculators, are intended to simplify and automate the process of sizing IP resources that are required for specific business operations. They are also useful for verifying and troubleshooting existing installations.
•Solution Expert Tool
Solution Expert is a web-based tool that assists in the design, configuration, quoting, and ordering of Unified Communications products. Solution Expert is available for Cisco sales and partner systems engineers who have Unified Communications specializations.
With the Solution Expert tool, users can generate a recommended solution based on their requirements. Users can modify the recommended configuration if desired. Solution Expert validates any changes when it presents the new solution. Solution Expert also generates a bill of materials with list pricing, a Visio diagram, and other design documentation. For an overview of how to use the tool, see the introductory PDF on the home page.
•SBCS Quick Pricing Tool
http://www.cisco.com/web/partners/downloads/partner/sell/technology/ipc/sbcs_quick_pricing_tool.xls 
This is SBCS partner offline pricing tool that provides quick price estimates. The price estimates includes key components of SBCS solution such as UC500, wireless, switching, etc. You can also enter the discount for partner and channel programs to arrive at the price estimates.
•Quote Builder Tool
http://www.cisco.com/web/partners/quotebuilder/index.html
The Quote Builder tool is a complete commercial solutions quoting application that enables specialized partners and Cisco employees to build a system quote for Security, Wireless and Unified Communications.
With Quote Builder, users can build a system quote with design documents to aid in the implementation of the solution. Quote Builder also validates designs for common deployments. Quote Builder generates a bill of materials, a network diagram, and design guides for deployment.
•Cisco Unified Communications Sizing Tool 
The Cisco Unified Communications Sizing Tool is a web-based tool that assists users with hardware sizing of large or complex Cisco Unified Communications solutions by calculating the call processing requirements for products that have a major impact on performance and scalability.
With the Cisco Unified Communications Sizing Tool, system engineers with Cisco Unified Communications solution experience or individuals with equivalent abilities can design and model solutions for existing and prospective customers. The tool requires various types of information to calculate the minimum size and type of devices required for a solution, such as the type and quantity of IP phones, gateways, and media resources. For most device types, the tool also requires the average number of call attempts per hour per device during the busy hour (known as busy hour call average or BHCA) and the average utilization time. The resulting calculations produced by the tool can be saved, copied, and sent to other users.
For additional information on design tools such as the Cisco Unified Communications Sizing Tool , as well as other system design topics, see the documentation wiki (DocWiki) at http://docwiki.cisco.com/wiki/Unified_Communications_System_Design .