All-in-one Home Loan Calculator
Estimate loan amount, monthly payment, escrow, PMI and APR in one place.
Amount and percentage stay synced with the current home price.
Unit switching converts from a stored source value to avoid drift.
APR estimate uses discount points when entered.
PMI is estimated while starting LTV is above 80%.
Use this All-in-One Home Loan Calculator to estimate your mortgage loan amount, monthly principal and interest, property taxes, homeowners insurance, HOA dues, estimated PMI, loan-to-value ratio, total monthly housing payment, and lifetime interest.
Important: This calculator provides a planning estimate. Your lender’s official Loan Estimate and Closing Disclosure should be used for actual mortgage rates, APR, fees, escrow amounts, mortgage insurance, and closing costs.
Home Loan Calculation Method
First calculate the down payment and mortgage principal:
Down payment = home price × down payment percentage
Loan amount = home price − down payment
The starting loan-to-value ratio is:
LTV = loan amount ÷ home price × 100
Monthly Principal and Interest
For a standard fixed-rate, fully amortizing mortgage:
M = P × [r(1 + r)n] ÷ [(1 + r)n − 1]
Where:
- M = monthly principal-and-interest payment
- P = loan amount
- r = monthly interest rate
- n = total number of monthly payments
Monthly interest rate = annual interest rate ÷ 12 ÷ 100
Total lifetime interest = monthly P&I × number of payments − loan amount
Taxes, Insurance, HOA and PMI
The calculator adds estimated recurring housing costs to the mortgage payment:
Monthly property tax = home price × annual property tax rate ÷ 12
Monthly homeowners insurance = annual insurance ÷ 12
When the calculator applies PMI:
Estimated monthly PMI = loan amount × annual PMI rate ÷ 12
The fuller monthly housing estimate is:
Total monthly payment = P&I + property tax + insurance + HOA + estimated PMI
Worked Example
Suppose you are buying a $400,000 home with:
- 20% down payment
- 6.5% fixed interest rate
- 30-year term
- 1.20% annual property tax rate
- $1,800 annual homeowners insurance
- $75 monthly HOA dues
The down payment is:
$400,000 × 20% = $80,000
The mortgage amount is:
$400,000 − $80,000 = $320,000
Starting LTV:
$320,000 ÷ $400,000 × 100 = 80%
The estimated monthly principal-and-interest payment is:
≈ $2,022.62
Monthly property tax:
$400,000 × 1.20% ÷ 12 = $400
Monthly homeowners insurance:
$1,800 ÷ 12 = $150
Estimated total monthly payment:
$2,022.62 + $400 + $150 + $75 = $2,647.62
With an 80% starting LTV, this example does not add PMI under the calculator’s simplified PMI rule.
If the mortgage is held for all 360 scheduled payments:
Estimated lifetime interest ≈ $408,142
Interest Rate, Points and APR
The mortgage interest rate is used to calculate the scheduled principal-and-interest payment.
Discount points are upfront charges that may be paid in exchange for a lower interest rate. One point equals 1% of the loan amount.
The calculator provides only a rough APR estimate when points are entered. Official APR calculations can include additional finance charges, so use the APR shown on lender disclosures when comparing actual loan offers.
Important Notes
- The calculator is primarily designed for standard fixed-rate, fully amortizing mortgages.
- Property taxes and homeowners insurance can change over time even when principal and interest remain fixed.
- Actual PMI costs depend on the lender, insurer, loan program, credit profile, and other factors.
- The calculator uses starting LTV for its simplified PMI estimate and does not model exact future PMI cancellation timing.
- HOA dues can increase and may not include special assessments.
- Closing costs, prepaid interest, title charges, lender fees, escrow deposits, maintenance, repairs, utilities, and moving costs are not included.
- Discount points do not reduce every mortgage rate by a fixed amount; the rate reduction depends on the lender and market.
- The calculator does not determine mortgage eligibility, debt-to-income qualification, credit approval, or affordability.