Calculate monthly payment, totals, and amortization schedule (annual/monthly). Optional extra payments supported.
| Total of 180 monthly payments | $303,788.46 |
| Total interest | $103,788.46 |
| Year | Interest | Principal | Ending Balance |
|---|---|---|---|
| 1 | $11,769.23 | $8,483.33 | $191,516.67 |
| 2 | $11,246.00 | $9,006.57 | $182,510.10 |
| 3 | $10,690.49 | $9,562.07 | $172,948.02 |
| 4 | $10,100.72 | $10,151.84 | $162,796.18 |
| 5 | $9,474.58 | $10,777.98 | $152,018.20 |
| 6 | $8,809.82 | $11,442.75 | $140,575.45 |
| 7 | $8,104.05 | $12,148.51 | $128,426.94 |
| 8 | $7,354.76 | $12,897.80 | $115,529.13 |
| 9 | $6,559.25 | $13,693.31 | $101,835.82 |
| 10 | $5,714.68 | $14,537.89 | $87,297.94 |
| 11 | $4,818.01 | $15,434.55 | $71,863.38 |
| 12 | $3,866.04 | $16,386.52 | $55,476.86 |
| 13 | $2,855.36 | $17,397.21 | $38,079.66 |
| 14 | $1,782.34 | $18,470.23 | $19,609.43 |
| 15 | $643.13 | $19,609.43 | $0.00 |
Extra payments reduce total interest and may shorten payoff time.
See exactly how your loan balance decreases over time with our free amortization calculator. Get a full period-by-period breakdown of principal and interest for any fixed-rate loan.
Each payment is split between interest (balance × periodic rate) and principal (payment − interest). As the balance shrinks, more of each payment goes toward principal, a process called amortization.
Since interest is calculated on the remaining balance, as the balance drops, the interest portion shrinks and the principal portion grows, even though the total payment stays the same.
This calculator shows the standard schedule; adding a lump-sum extra payment would shorten the remaining schedule since the balance drops faster.
A large lump-sum payment due at the end of some loan types; this calculator assumes a fully amortizing loan unless otherwise specified.
The core math is the same for any fixed-rate, fixed-term loan, though some loans may have additional fees or adjustable rates not reflected here.