Finance

Home Loan Total Interest Calculator (20 Years)

Estimate total interest paid over a loan. This home version uses a 20-year planning term as its starting point.

Over 20 years, total interest is the extra amount paid to the lender on top of the borrowed amount, and total paid is the borrowed amount plus that interest, so together they show the full cost of the home loan rather than just the price of the home.

Formula

Total interest equals monthly EMI times number of payments minus the principal.

How it works

A longer term lowers the monthly payment but raises total interest.

Worked example

Loan amount $200,000, annual rate 6.5%, term 20 years. The monthly rate is 6.5% divided by 12, which is 0.0054167, and there are 240 monthly payments. Using the page formula, the EMI is $1,491.15 a month, so the total paid is $357,875.11. Total interest is the total paid minus the principal, which is $357,875.11 minus $200,000, equal to $157,875.11, or 78.9 of the amount borrowed.

From 15 to 20 years the EMI falls by only $251.06 a month, yet total interest rises by $44,276.46. For a home buyer that is the point where stretching the term starts to buy very little monthly relief for a large extra cost, so the extra five years should be chosen for a real cash-flow reason, not by default.

Who this term suits for a home buyer: a home buyer balancing a monthly payment with lifetime cost, for example a family that needs room for school costs, a car, and home repairs, but still wants the mortgage finished well before retirement.

FAQs

Why does a longer loan cost more interest?
More payments mean interest is charged for longer, so total interest rises even if each payment is smaller.

Is this home calculator exact?
No, it is an estimate for planning only, based on the numbers you enter.

Are these figures financial advice?
No, they are estimates for planning only, not financial advice. Check with a qualified adviser for decisions involving large sums.

Is 20 years too long for a home loan?
Not necessarily, but it is past the point where stretching buys much relief: the EMI is $1,491.15, only $251.06 below the 15-year figure, while interest rises to $157,875.11. A 20-year term needs a cash-flow reason, not just a lower monthly figure.

Why does the EMI fall by only $251.06 from 15 to 20 years?
Because most of the early payments on a longer loan go to interest, so adding five years spreads the principal only a little thinner each month. The saving looks small because the loan is still largely interest in its early years.

What happens if the borrower refinances at year 10 of a 20-year home loan?
The remaining balance is refinanced on the new rate and term, so total interest changes from the $157,875.11 shown here. Refinancing can help if rates have fallen, but fees and a new longer term can wipe out the saving.

Estimates only, not financial advice. Figures are approximate and do not include all fees, taxes, or changing rates unless stated.