Replicate a similar architecture on Google Cloud, conduct a scaled-down load test, and analyze the billing details to project expenses based on your system's typical workload.

Use the Google Cloud Pricing Calculator with the Cloud Operations template to detail your web application's specifics for a cost estimate.

Create a Google spreadsheet with various Google Cloud resource combinations, import current service prices, and use formulas for cost calculations.

Employ the Google Cloud Pricing Calculator to estimate costs for each Google Cloud resource planned for use, comparing on-premises machines to Cloud SQL for accurate estimation.