// multi-utility computation suite · offline · instant · precise
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fin.mortgage-amortization-schedule Calculator
Generates the complete mortgage amortisation schedule from loan amount, rate, and term, showing interest/principal split per payment. The amortisation schedule reveals that a 30-year mortgage at 6% is approximately 80% interest in year 1 — the principal barely moves for the first decade.
Inputs
P Principal
The amount borrowed before any interest is added. Reducing this with a larger down payment cuts both monthly payments and total interest over the loan life.
R Annual Pct
Yearly rate charged on the outstanding balance. Enter as a percentage (e.g. 6.5 for 6.5%). Even 0.5% difference on a large loan adds up to tens of thousands over 30 years.
N Years
How many years to repay the loan. 15-year terms cost more monthly but far less in total interest. 30-year terms lower monthly payments but increase total cost significantly.
Month
Reference formula or conversion factor shown for context.
Results
monthly payment PMT ($)
Your fixed monthly payment, calculated using the PMT formula P·r(1+r)ⁿ / ((1+r)ⁿ−1). Covers principal and interest only — add property tax, insurance, and PMI for the true monthly housing cost.
balance at month
The value at the specified point or condition.
interest portion this month ($)
Sample size or count used in the calculation.
principal portion this month ($)
Sample size or count used in the calculation.
remaining balance after month
Outstanding principal still owed. Falls slowly early in the loan because most payments cover interest. The drop accelerates in later years.
total interest paid over life ($)
Total interest paid over the life of the loan — the real cost of borrowing. On a $400k 30-year loan at 7%, this often exceeds $550,000.