Temelios

Amortization Calculator

See how each payment splits between principal and interest.

Produces a full amortization summary (monthly payment, total interest paid) and shows how the loan balance decreases over time.

Understanding amortization reveals how much equity you're building with each payment and helps you decide when a refinance makes sense.

1
Enter loan principal: The amount you're borrowing.
2
Enter annual interest rate: As a percentage.
3
Enter loan term in years: Typically 15 or 30 years for investment properties.
4
Review the summary: See monthly payment, total paid, and total interest cost over the full term.

Loan Principal ($)

Annual Interest Rate (%)

Term (years)

Monthly Payment$1,398

Total of All Payments$503,434

Total Interest Paid$303,434

•On a 30-year loan, you pay more interest in year 1 than principal — equity buildup accelerates dramatically in later years.
•Extra principal payments early in the loan have the largest impact; even one extra payment per year can cut years off the term.
•When refinancing, your amortization clock resets. Calculate total interest paid across both loans, not just the new monthly payment.
•Interest-only periods (common on bridge and construction loans) defer equity buildup — budget for the payment jump when they convert to amortizing.
•Compare total cost of a 15-year vs. 30-year loan: the 30-year is more expensive in total interest paid, often by 50–80% of the original loan amount.

Want the full picture?

These calculators use your assumptions. Temelios pulls real comps and census data so your vacancy, rent, and expense inputs are grounded in reality.