How to use it
- Enter the home price in dollars
- Set your down‑payment percentage
- Input the annual PMI rate percentage
- Read the monthly PMI amount displayed
What it does – The calculator takes your home price, down‑payment percentage and annual PMI rate, calculates the loan amount, applies the PMI rate yearly and divides by 12 to give a monthly figure. Why it matters – PMI can add hundreds of dollars to your mortgage each month, affecting cash flow and total cost. Knowing the exact monthly amount helps you decide whether to increase your down payment, shop for a lower PMI rate, or refinance. How to read the result – The number shown is the amount you’ll pay every month for private mortgage insurance until you reach the required equity threshold. For a $300,000 home with a 10% down payment and a 0.5% annual PMI rate, the loan is $270,000, yearly PMI $1,350 and monthly PMI $112.50. Use it alongside your principal‑and‑interest payment to see the full monthly housing expense.
Pro tips
- Round the down‑payment percentage to whole numbers for quicker entry
- Use the exact annual PMI rate from your lender; small changes affect the monthly total
- If your down payment is 0%, the loan amount equals the full home price
- Double‑check that the PMI rate is expressed as a percent, not a decimal
Real-life examples
- First‑time buyer wants to know how much extra they’ll pay each month with 5% down
- Refinance candidate compares PMI costs before deciding to pull equity
- Real estate investor evaluates the impact of PMI on cash‑flow for a rental property
Case study
Maria was planning to buy a $250,000 house with a 8% down payment and a 0.6% PMI rate. Using the calculator she saw her monthly PMI would be $112, so she increased her down payment to 12%, cutting the PMI to $0 and saving $112 each month.