Home & Money topic

Buying a Home calculators

From affordability to closing costs, work through the full home-buying decision with the tools that estimate each piece.

Reviewed by BoringToolsKit · August 24, 2026 · Planning information, not professional advice.

What this covers

Buying a Home: the big picture

Buying a home is the largest financial decision most people make, and it has more moving parts than the price tag suggests — down payment, monthly payment, taxes, insurance, and the total interest you pay over the life of the loan. Before you commit, model the number that actually matters: what you'll pay each month and how much interest the loan costs over time. BoringToolsKit's home-buying calculators estimate each piece so you can compare a purchase against your budget instead of against the asking price.

  • Down payment under 20% usually adds private mortgage insurance (PMI).
  • The monthly payment is principal + interest + taxes + insurance.
  • Total interest on a 30-year loan often exceeds the loan amount.
  1. Determine a comfortable monthly payment (including taxes and insurance).
  2. Estimate your down payment and whether PMI applies.
  3. Model the loan amount, rate, and term to see the monthly payment and total interest.
Worked example

Worked example: a $2,000-a-month home budget

  1. Step 1: Mortgage Affordability Calculator — Enter $4,800 gross monthly income and $350 in debts; keep the 28/36 guidance in view See: A comfortable housing payment lands near $1,950 a month
  2. Step 2: Down Payment Calculator — Try a $380,000 price with 20% down See: $76,000 down avoids private mortgage insurance
  3. Step 3: Mortgage Payment Calculator — Loan $304,000 at 6.5% for 30 years See: Principal and interest around $1,920 a month
  4. Step 4: Amortization Calculator — Use the same $304,000 / 6.5% / 30-year loan See: The first year is mostly interest — roughly $19,600 goes to interest

Numbers depend on the inputs you enter; the walkthrough shows one realistic scenario.

Tools for Buying a Home

Mortgage Affordability CalculatorFind an affordable home price from income, debts, down payment, rate, taxes, insurance, HOA, and your DTI cap.
Mortgage Payment CalculatorEstimate your monthly mortgage payment including principal, interest, taxes, and insurance. Enter loan amount, rate, and term for a full breakdown. Private.
Loan Comparison CalculatorCompare monthly payment, total interest, and total cost for two fixed-rate loans.
Amortization CalculatorCalculate your monthly loan payment and full amortization schedule, and see how extra monthly payments shorten the term and reduce total interest.
Mortgage Overpayment CalculatorSee how extra monthly payments or a one-time lump sum cut years off a mortgage and save interest. Enter loan, rate, term, and overpayments for a private estimate.
Mortgage Refinance Break-Even CalculatorCompare old and new mortgage payments and estimate refinance break-even time.
Down Payment CalculatorCalculate your down payment, loan amount, closing costs, and cash needed to close in percent or dollar-amount mode.
Rent Affordability CalculatorEstimate affordable rent using your income, chosen cap, debt, and savings. Your suggested maximum is the lower of the income cap or cash available.