US Fixed Mortgage Calculator
30-year & 15-year fixed mortgage with property taxes, home insurance, and PMI breakdown.
For a $450,000 home with 20% down, your monthly payment is $2,842.
How to Use the US Fixed Mortgage Calculator (3-Step Guide)
Enter Purchase & Down Payment
Input your estimated home purchase price and cash down payment available.
Set Interest Rate & Term
Choose your expected mortgage rate and loan duration (typically 30 or 15 years).
Review Monthly & Total Costs
Instantly analyze your monthly P&I, escrow taxes, insurance, and full amortization schedule.
Monthly P&I = Principal × [r(1+r)^n] / [(1+r)^n - 1] + Monthly Taxes + Insurance + PMI
All algorithms are executed with 64-bit IEEE 754 floating-point mathematical precision directly in your browser. No financial data leaves your device.
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Frequently Asked Questions (FAQ)
How to Use the US Fixed Mortgage Calculator
Step-by-step instructions to calculate fixed mortgage metrics accurately
Enter Purchase & Down Payment
Input your estimated home purchase price and cash down payment available.
Set Interest Rate & Term
Choose your expected mortgage rate and loan duration (typically 30 or 15 years).
Review Monthly & Total Costs
Instantly analyze your monthly P&I, escrow taxes, insurance, and full amortization schedule.
Mathematical Methodology & Formula
Verified financial principles powering our client-side calculations
The US Fixed Mortgage Calculator implements financial computation models adhering to standard actuarial and algorithmic accounting principles. Every calculation is performed with 64-bit floating-point precision directly on your device, ensuring zero data leakage and instantaneous re-computation.
Frequently Asked Questions
Clear answers to common questions about fixed mortgage
How is a fixed-rate mortgage payment calculated?↓
Fixed monthly principal and interest payments use the standard annuity formula: M = P[r(1+r)^n]/[(1+r)^n - 1], where P is principal, r is the monthly interest rate, and n is total months.
When is PMI required on a mortgage?↓
Private Mortgage Insurance (PMI) is required by conventional lenders if your down payment is less than 20% (Loan-to-Value > 80%). It drops off once LTV reaches 78-80%.
Should I choose a 15-year or 30-year fixed loan?↓
A 15-year loan has higher monthly payments but significantly lower interest rates and saves tens of thousands in lifetime interest compared to a 30-year loan.
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