📚 What's in This Guide
Most "mortgage calculators" only tell you half the story: the principal and interest payment. But that number is rarely what actually leaves your bank account every month. Property taxes, homeowners insurance, mortgage insurance, and HOA dues get added on top — and on many homes, that "on top" amount is hundreds of dollars a month that a bare-bones calculator never shows you.
This mortgage calculator covers Conventional, FHA, VA, and USDA loans, calculates your complete monthly payment, estimates when mortgage insurance is projected to end for each loan type, shows how much extra payments save you, and gives you a full monthly or annual amortization schedule — all without an account, a lead form, or a call from a loan officer.
1. How Your Mortgage Payment Is Actually Calculated
The core of every fixed-rate mortgage payment is the standard amortization formula:
Where M is your monthly principal & interest payment, P is the loan amount, r is your monthly interest rate (annual rate ÷ 12), and n is the total number of monthly payments (loan term in years × 12).
Example: Borrow $320,000 (a $400,000 home with 20% down) at 6.75% for 30 years. r = 0.0675 ÷ 12 = 0.005625, and n = 360. Plugging into the formula gives a principal & interest payment of roughly $2,076/month — before taxes, insurance, or anything else.
2. PITI: The Four Parts of a Real Payment
Lenders call your full monthly payment PITI:
- Principal — the portion that pays down what you borrowed.
- Interest — the lender's charge for the loan, calculated on your remaining balance.
- Taxes — your annual property tax bill, divided by 12 and usually collected into an escrow account.
- Insurance — homeowners insurance, also usually escrowed monthly.
On top of PITI, two more line items often apply: mortgage insurance (PMI, MIP, or a guarantee/funding fee, depending on loan type) and HOA dues (if the property has a homeowners association). This calculator includes all of these, because leaving any of them out gives you a payment number that simply won't match your real bill.
3. Mortgage Insurance: PMI, MIP, Funding Fees & Guarantee Fees
Conventional loans — PMI. Private Mortgage Insurance protects the lender, not you, if you default with less than 20% equity. Under the federal Homeowners Protection Act, a lender must automatically cancel PMI on a conventional loan once your balance falls to 78% of the home's original value, and you can request cancellation yourself at 80%. Full details are on the Consumer Financial Protection Bureau's PMI page. Note that the Homeowners Protection Act does not apply to FHA, VA, or USDA loans — each of those programs sets its own rules.
FHA loans — MIP. FHA charges an upfront Mortgage Insurance Premium (financed into the loan) plus an annual MIP paid monthly. Under current rules, if your down payment was 10% or more, annual MIP cancels automatically after 11 years; if your down payment was under 10%, MIP generally stays for the life of the loan. See HUD's MIP guidance for details.
VA loans — funding fee. VA loans don't charge monthly mortgage insurance at all. Instead, most borrowers pay a one-time funding fee (commonly financed into the loan) that varies by down payment and whether it's a first or subsequent use of the benefit; some veterans are exempt. See the VA's funding fee explainer.
USDA loans — guarantee fee. USDA guaranteed loans charge an upfront guarantee fee (financed into the loan) plus a smaller annual fee that continues for the life of the loan rather than dropping off at a set equity threshold. See USDA Rural Development's fee notice.
Select a loan type in the calculator above and the relevant fee fields, disclosures, and cancellation logic update automatically.
4. Conventional vs. FHA vs. VA vs. USDA
| Loan Type | Typical Down Payment | Mortgage Insurance |
|---|---|---|
| Conventional | As low as 3%, no PMI required at 20%+ | PMI, cancels at 78–80% loan-to-value |
| FHA | As low as 3.5% | Upfront + annual MIP; often lasts the life of the loan if down payment was under 10% |
| VA | Often 0% for eligible veterans/service members | No monthly premium; one-time funding fee instead (some exemptions apply) |
| USDA | Often 0% in eligible rural areas | Upfront + annual guarantee fee, continues for the life of the loan |
This is a general overview, not eligibility guidance — program rules, income and location limits, and rates change over time, so confirm current details with a lender or the official program pages linked above before making decisions.
5. What to Look for in a Mortgage Calculator
The core amortization math is identical across every calculator, since it's a fixed, well-known formula — what differs between tools is completeness and how the site is built. Here's what a genuinely useful mortgage calculator should offer:
| Feature | Why it matters | This calculator |
|---|---|---|
| Full PITI + mortgage insurance | A payment estimate without taxes, insurance, and PMI/MIP won't match your real bill | Included |
| Support for FHA/VA/USDA, not just conventional | Government-backed loans use different mortgage-insurance rules | Included |
| Automatic mortgage-insurance drop-off tracking | Tells you when your payment is projected to drop, not just what it starts at | Included |
| Extra-payment savings simulator | Shows the real payoff-time and interest impact of paying more than the minimum | Included |
| Monthly (not just annual) amortization detail | Lets you see exactly what a specific month's payment looks like | Included |
| Runs entirely in your browser, no lead-gen forms | Your numbers stay private and you aren't funneled toward lender ads | Included |
6. How Extra Payments Save You Years and Thousands
Because interest is charged on your remaining balance, any extra amount you pay toward principal reduces the interest charged on every single payment that follows — not just that one month. That compounding effect is why relatively small extra payments produce outsized savings.
Use the Extra Payments tab above to test your own numbers — you can add a recurring monthly amount, a one-time lump sum (like a bonus or tax refund), or both, and see the exact new payoff date and total interest saved.
7. Reading an Amortization Schedule
An amortization schedule breaks every payment into how much went to interest versus principal. Early in the loan, most of each payment is interest, because the balance is still high. As the balance shrinks, more of each payment shifts toward principal — which is exactly why extra payments made early in a loan save far more than the same extra payment made later.
The Amortization Schedule tab shows this month by month or year by year — use the view toggle to switch — including any extra payments you've entered, and highlights the period your mortgage insurance is projected to drop off.
8. How Much Mortgage Can You Actually Afford?
Beyond what a lender will approve you for, a useful sanity check is the 28/36 rule:
- 28% front-end ratio: your total housing payment (PITI + HOA) should generally stay under 28% of your gross monthly income.
- 36% back-end ratio: all of your debt payments combined (mortgage, car loans, credit cards, student loans) should stay under 36% of gross monthly income.
Lenders sometimes approve higher ratios depending on credit score and loan program, but staying near 28/36 leaves more breathing room in your monthly budget.
9. Methodology & Limitations
This calculator uses the standard fixed-rate amortization formula shown in Section 1 to compute principal and interest, then adds property tax, homeowners insurance, HOA dues, and a mortgage-insurance estimate on top. A few simplifications are worth knowing about:
- Mortgage insurance is modeled as a constant monthly amount based on your original loan amount and the rate you enter, until the estimated drop-off point. Some lenders and programs recalculate premiums against the declining balance instead — actual bills can differ slightly from this estimate.
- FHA/VA/USDA fee defaults are general-case figures (e.g., FHA's 0.55% annual MIP, VA's 2.15% first-time funding fee, USDA's 1%/0.35% guarantee fee) as published by HUD, the VA, and USDA at the time of writing. Your actual rate can vary by loan amount, term, LTV, credit profile, service history, or program updates — all fee fields are editable so you can enter your own quoted numbers.
- Property tax, insurance, and HOA fees are assumed flat for the life of the loan. In reality these typically rise over time.
- This tool assumes a fixed interest rate for the full term. It does not model adjustable-rate mortgages (ARMs), rate buydowns, or refinancing.
- PMI/MIP cancellation dates are projections based on your entered numbers, not a guarantee — actual servicer timelines depend on your specific loan documents, payment history, and any required appraisal.
- This tool is for estimation and educational purposes only and is not financial, tax, or lending advice. For a binding number, get a Loan Estimate from a licensed lender.
10. Frequently Asked Questions
Monthly principal and interest is calculated with the amortization formula M = P[r(1+r)ⁿ] / [(1+r)ⁿ−1], where P is the loan amount, r is the monthly interest rate, and n is the total number of payments. Property tax, insurance, mortgage insurance, and HOA are then added on top for your total monthly payment.
Under the federal Homeowners Protection Act, lenders must automatically cancel PMI on a conventional loan once your loan balance drops to 78% of the original home value, as long as payments are current. You can also request cancellation earlier once you reach 80% loan-to-value. FHA, VA, and USDA loans are not covered by this law and follow their own mortgage-insurance rules — see Section 3 above.
It depends on your balance, rate, and how early you start, but because extra payments skip interest entirely and reduce principal directly, even a modest recurring extra payment can cut years off a 30-year loan and save a significant amount in interest. Use the Extra Payments tab above with your own numbers for an exact estimate.
A common guideline is the 28/36 rule: your total housing payment should stay under 28% of gross monthly income, and total debt payments under 36%. Lenders may allow higher ratios depending on credit and loan program.
No. Every calculation runs locally in your browser. Nothing you type is sent to a server, there is no account, and there are no lender ads or lead-generation forms.
Rates and fee figures cited above reflect national program averages as of early August 2026 and change over time — always use your own quoted rate and confirm current fee schedules with your lender or the official program pages linked in Section 3. This calculator is for estimation only and is not financial or lending advice.