Loan & Mortgage Calculator
Monthly payment, full amortization schedule and how extra payments shorten the loan
Examples
Typical mortgage
250,000 · 6.5% · 20 yearsPayment ≈ 1,865/mo · Total interest ≈ 197,600 · Payoff 240 monthsEarly payments are mostly interest — the schedule shows the split line by line.
Extra 200/month
Same loan + 200 extra≈ 2 years earlier · ≈ 23,000 interest savedExtras shorten the term instead of changing the payment — the tool quantifies both.
About this tool
The monthly payment comes from the standard annuity formula; everything after that is a month-by-month simulation of the amortization schedule — interest on the remaining balance, principal from what's left, extras going straight to principal.
Because the schedule is simulated, extra payments show their real effect: fewer months, less interest, with both figures reported explicitly and the balance curve overlaid against the no-extras baseline.
How to use
Enter loan terms
Amount, annual rate, term in years — and optionally an extra monthly amount toward principal.
Read the payment
Monthly payment, total interest, total paid and payoff length update instantly.
Test extra payments
Add 100–300 extra per month and watch interest saved and months cut appear.
Export
Download the amortization schedule as CSV or copy the summary for comparison shopping.
Use cases
Mortgage shopping
Compare rate/term combinations on total cost, not just the headline payment.
Prepayment planning
Decide whether an extra monthly amount fits the budget by seeing exactly what it saves.
Common mistakes
Mistake:Assuming extras reduce next month's required payment
Fix:On fixed annuities extras shorten the term; the payment stays constant until payoff.
Mistake:Ignoring total interest
Fix:A lower payment over a longer term often costs more — always compare total paid.
Frequently asked questions
Related guides
An Offline Currency Converter, On Purpose
Why a converter that calls no API is a feature: snapshot rates, USD-base cross rates, and manual override for exact accounting.
Compound Interest With Monthly Contributions: Why Simulation Beats the Formula
How contribution timing and compounding frequency change a 20-year projection, and why period-by-period simulation gives the honest number.
References & standards
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