Advanced Cloud Cost Calculator

This model calculates a fixed hourly price for resources based on a forecasted **Target Utilization Rate**. It's ideal for creating a predictable price list for customers (IaaS/SaaS) but carries the risk of financial loss if actual usage is lower than the target.

Formulas & Logic:

1. Calculate Total Annual Cost (C_annual): The yearly operational costs are added to the amortized capital costs.

2. Determine Break-Even Rate (R_unit): The total hourly cost is allocated to each resource type (CPU, RAM) based on its weight, then divided by the *usable* capacity (total capacity adjusted for target utilization).

3. Calculate Final Price (P_unit): A profit margin is added to the break-even rate.

Legend:

• C_CapEx: Total Capital Expenditures
• A_y: Amortization Period (Years)
• C_OpEx: Total Annual Operational Expenditures
• C_hourly: Total Hourly Cost of Infrastructure
• W_unit: Cost Allocation Weight for the resource
• N_unit: Total number of units for the resource (e.g., total vCPUs)
• U_target: Target Utilization Rate
• M: Profit Margin

This model is used for internal cost allocation (chargeback) rather than public pricing. It ignores individual resource consumption and divides the total annual cost of the infrastructure (plus a margin) equally among a known number of projects or tenants. This ensures full cost recovery and provides simple, predictable budgeting for each tenant. The cost is revised as new tenants join.

Formula & Logic:

1. Calculate Annual Cost per Project (C_project): The total annual cost (with profit margin) is simply divided by the number of projects.

Legend:

• C_annual: Total Annual Cost of Infrastructure
• M: Profit Margin
• N_projects: Number of Projects / Tenants

This advanced model blends predictability and fairness. Each tenant pays a fixed **Base Cost** which covers a resource **Allowance**. Usage beyond this allowance is billed at a higher **Overage Rate**. This guarantees revenue to cover fixed costs while charging heavy users appropriately.

Formulas & Logic:

1. Calculate Base Cost per Tenant (C_base): A portion of the total annual cost is designated as the base and divided among tenants.

2. Calculate Overage Rate (P_overage): The remaining annual cost is recovered through overage, priced at a premium (lower effective utilization).

Legend:

• C_annual: Total Annual Cost of Infrastructure
• B_split: Base Cost Split (e.g., 80%)
• N_projects: Number of Projects / Tenants
• U_overage: Effective Utilization for Overage Pricing
• * Other symbols are the same as the Standard Model.