Crunch My Mortgage

Mortgage calculators that show their work

Free, private tools for every mortgage question, from the monthly payment to a recast or a refinance. Results come from the numbers you type, never from market rates or local data, and the math is explained under every calculator.

Your inputs

Open this link to restore these inputs:

Estimate for education only. Not a loan offer, a rate quote or financial advice; actual terms come from a lender. crunchmymortgage.com

Starting values are placeholders, not market data. Replace them with your own numbers.

Home and loan

The annual rate on your quote, not the APR.

Monthly costs on top

Used only while the loan is over 80% of the price.

Results

Estimated monthly payment $2,858.38

Principal and interest $2,158.38 on a $360,000 loan

  • Principal & interest$2,158.38
  • Property tax$400.00
  • Homeowners insurance$150.00
  • PMI$150.00

PMI drops off after 8 years 7 months, when the scheduled balance reaches 78% of the price. The payment then falls to $2,708.38.

Total interest
$417,019
Paid off in
30 years
All principal and interest
$777,019
Loan-to-value
90%

See the amortization schedule

Every calculator

17 focused tools. Each one has its own page with the formula, a worked example and answers to common questions.

Start here

The numbers every buyer needs first.

Mortgage payment Full monthly payment with tax, insurance, PMI and HOA, plus the schedule. Home affordability The price your income and debts support, with your own DTI limits. Debt-to-income ratio Front-end and back-end DTI, and how much room is left. Loan A vs loan B Two offers side by side over the years you will actually keep the loan.

Specific situations

Focused answers for one decision at a time.

Mortgage recast Your new payment after a lump sum, and recast vs. simply prepaying. Points break-even How many months until discount points pay for themselves. Temporary buydown Year-by-year payments and the total cost of a 2-1 or 3-2-1 buydown. Extra payments How extra principal shortens the loan and the interest it saves. Biweekly payments Half a payment every two weeks versus monthly: time and interest saved. Interest-only and HELOC Interest-only or draw-period payments and the jump when repayment starts. Refinance break-even When a refinance pays for itself, counting costs and balance.

Planning ahead

Dates, scenarios and the cash you need on closing day.

PMI removal date When your balance reaches 80% and 78% of the original value. ARM payment change Your payment after the fixed period, with the caps you enter. Rent vs buy Net worth after renting or buying, over the years you plan to stay. Cash to close Down payment, fees, prepaids and escrow, minus credits.

Government-backed loans

Official fee tables, with the source shown on the page.

FHA mortgage insurance Upfront and annual MIP from HUD's published table. VA funding fee The fee for your loan type, use and down payment, from VA's table.

How this site works

Your numbers stay with you

Every calculation runs in your browser. Nothing you type is sent to us or stored. A link with your inputs is created only when you choose Copy link.

Nothing to go out of date

There are no market rates, no "today's rates" and no local data. The only reference tables are the official FHA and VA fee tables, each shown with its source and the date it was checked. Everything else comes from your own quote, bill or statement.

A calculator, not a sales pitch

Crunch My Mortgage is free. It does not take loan applications, quote rates, collect leads or sell visitor information, and no lender pays to be featured. Ads keep the lights on.

The five numbers behind every mortgage payment

Almost every mortgage question comes back to a handful of inputs. Knowing what each one does makes any quote easier to read.

1. The loan amount

The price minus your down payment. Interest is charged on this balance, so every dollar of down payment is a dollar that never collects interest. A smaller loan also changes whether private mortgage insurance applies: on most conventional loans it is charged when the loan is more than 80% of the home's value.

2. The interest rate

The note rate on your loan, divided by 12 to get the monthly rate. It is not the same as the APR, which folds certain fees into a single yearly figure for comparing offers. Your payment is always calculated from the note rate.

3. The term

The number of years, times 12, gives the number of payments. A shorter term raises the payment but cuts total interest sharply, because the balance falls faster. On a $300,000 loan at 6%, a 30-year term means $1,798.65 a month and $347,515 of interest; a 15-year term means $2,531.57 a month and $155,683 of interest. The loan comparison calculator lays two options side by side.

4. Escrow: tax and insurance

Most lenders collect property tax and homeowners insurance with each payment and pay the bills for you. These amounts are set by your tax bill and your policy, not by the loan, and they are recalculated every year. The mortgage payment calculator adds them to principal and interest so you see the full monthly cost.

5. Time

How long you keep the loan decides whether paying points, refinancing or recasting comes out ahead. Several calculators here ask how many years you expect to stay, then show the break-even point: the month an upfront cost has been earned back. See the points and refinance break-even calculators.

Every result on this site is an estimate for education. Your lender's Loan Estimate and Closing Disclosure are the documents that count; use these tools to understand them and to test what-if scenarios before you sign.