Money

Amortization calculator

Create a monthly amortization schedule with interest, principal, balance, loan dates, and optional extra payments.

CALCULATOR

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Instant results

LOAN DETAILS

Loan amount

Loan term (years)

Additional months

Interest rate

Loan start date

Optional: make extra payments

Extra monthly pay

Extra yearly pay

Extra one-time pay

One-time payment month

MONTHLY PAYMENT$1,687.71Regular principal and interest payment

Total of 180 payments$303,788.46

Total interest$103,788.46

Extra paid$0.00

Payoff date07/2041

LOAN BALANCE

Payoff path

Balance

View amortization schedule ＋

Month	Date	Interest	Principal	Ending balance
1	08/2026	$1,000.00	$687.71	$199,312.29
2	09/2026	$996.56	$691.15	$198,621.13
3	10/2026	$993.11	$694.61	$197,926.53
4	11/2026	$989.63	$698.08	$197,228.45
5	12/2026	$986.14	$701.57	$196,526.87
6	01/2027	$982.63	$705.08	$195,821.79
7	02/2027	$979.11	$708.60	$195,113.19
8	03/2027	$975.57	$712.15	$194,401.04
9	04/2027	$972.01	$715.71	$193,685.33
10	05/2027	$968.43	$719.29	$192,966.05
11	06/2027	$964.83	$722.88	$192,243.16
12	07/2027	$961.22	$726.50	$191,516.67
13	08/2027	$957.58	$730.13	$190,786.53
14	09/2027	$953.93	$733.78	$190,052.75
15	10/2027	$950.26	$737.45	$189,315.30
16	11/2027	$946.58	$741.14	$188,574.17
17	12/2027	$942.87	$744.84	$187,829.32
18	01/2028	$939.15	$748.57	$187,080.76
19	02/2028	$935.40	$752.31	$186,328.45
20	03/2028	$931.64	$756.07	$185,572.38
21	04/2028	$927.86	$759.85	$184,812.52
22	05/2028	$924.06	$763.65	$184,048.87
23	06/2028	$920.24	$767.47	$183,281.40
24	07/2028	$916.41	$771.31	$182,510.10
25	08/2028	$912.55	$775.16	$181,734.93
26	09/2028	$908.67	$779.04	$180,955.89
27	10/2028	$904.78	$782.93	$180,172.96
28	11/2028	$900.86	$786.85	$179,386.11
29	12/2028	$896.93	$790.78	$178,595.33
30	01/2029	$892.98	$794.74	$177,800.59
31	02/2029	$889.00	$798.71	$177,001.88
32	03/2029	$885.01	$802.70	$176,199.18
33	04/2029	$881.00	$806.72	$175,392.46
34	05/2029	$876.96	$810.75	$174,581.71
35	06/2029	$872.91	$814.81	$173,766.90
36	07/2029	$868.83	$818.88	$172,948.02
37	08/2029	$864.74	$822.97	$172,125.05
38	09/2029	$860.63	$827.09	$171,297.96
39	10/2029	$856.49	$831.22	$170,466.74
40	11/2029	$852.33	$835.38	$169,631.36
41	12/2029	$848.16	$839.56	$168,791.80
42	01/2030	$843.96	$843.75	$167,948.05
43	02/2030	$839.74	$847.97	$167,100.07
44	03/2030	$835.50	$852.21	$166,247.86
45	04/2030	$831.24	$856.47	$165,391.39
46	05/2030	$826.96	$860.76	$164,530.63
47	06/2030	$822.65	$865.06	$163,665.57
48	07/2030	$818.33	$869.39	$162,796.18
49	08/2030	$813.98	$873.73	$161,922.45
50	09/2030	$809.61	$878.10	$161,044.35
51	10/2030	$805.22	$882.49	$160,161.86
52	11/2030	$800.81	$886.90	$159,274.95
53	12/2030	$796.37	$891.34	$158,383.61
54	01/2031	$791.92	$895.80	$157,487.82
55	02/2031	$787.44	$900.27	$156,587.54
56	03/2031	$782.94	$904.78	$155,682.77
57	04/2031	$778.41	$909.30	$154,773.47
58	05/2031	$773.87	$913.85	$153,859.62
59	06/2031	$769.30	$918.42	$152,941.20
60	07/2031	$764.71	$923.01	$152,018.20
61	08/2031	$760.09	$927.62	$151,090.57
62	09/2031	$755.45	$932.26	$150,158.31
63	10/2031	$750.79	$936.92	$149,221.39
64	11/2031	$746.11	$941.61	$148,279.78
65	12/2031	$741.40	$946.31	$147,333.47
66	01/2032	$736.67	$951.05	$146,382.42
67	02/2032	$731.91	$955.80	$145,426.62
68	03/2032	$727.13	$960.58	$144,466.04
69	04/2032	$722.33	$965.38	$143,500.66
70	05/2032	$717.50	$970.21	$142,530.45
71	06/2032	$712.65	$975.06	$141,555.39
72	07/2032	$707.78	$979.94	$140,575.45
73	08/2032	$702.88	$984.84	$139,590.61
74	09/2032	$697.95	$989.76	$138,600.85
75	10/2032	$693.00	$994.71	$137,606.14
76	11/2032	$688.03	$999.68	$136,606.46
77	12/2032	$683.03	$1,004.68	$135,601.78
78	01/2033	$678.01	$1,009.70	$134,592.07
79	02/2033	$672.96	$1,014.75	$133,577.32
80	03/2033	$667.89	$1,019.83	$132,557.49
81	04/2033	$662.79	$1,024.93	$131,532.57
82	05/2033	$657.66	$1,030.05	$130,502.52
83	06/2033	$652.51	$1,035.20	$129,467.32
84	07/2033	$647.34	$1,040.38	$128,426.94
85	08/2033	$642.13	$1,045.58	$127,381.36
86	09/2033	$636.91	$1,050.81	$126,330.55
87	10/2033	$631.65	$1,056.06	$125,274.49
88	11/2033	$626.37	$1,061.34	$124,213.15
89	12/2033	$621.07	$1,066.65	$123,146.50
90	01/2034	$615.73	$1,071.98	$122,074.52
91	02/2034	$610.37	$1,077.34	$120,997.18
92	03/2034	$604.99	$1,082.73	$119,914.45
93	04/2034	$599.57	$1,088.14	$118,826.31
94	05/2034	$594.13	$1,093.58	$117,732.73
95	06/2034	$588.66	$1,099.05	$116,633.68
96	07/2034	$583.17	$1,104.55	$115,529.13
97	08/2034	$577.65	$1,110.07	$114,419.07
98	09/2034	$572.10	$1,115.62	$113,303.45
99	10/2034	$566.52	$1,121.20	$112,182.25
100	11/2034	$560.91	$1,126.80	$111,055.45
101	12/2034	$555.28	$1,132.44	$109,923.01
102	01/2035	$549.62	$1,138.10	$108,784.91
103	02/2035	$543.92	$1,143.79	$107,641.13
104	03/2035	$538.21	$1,149.51	$106,491.62
105	04/2035	$532.46	$1,155.26	$105,336.36
106	05/2035	$526.68	$1,161.03	$104,175.33
107	06/2035	$520.88	$1,166.84	$103,008.49
108	07/2035	$515.04	$1,172.67	$101,835.82
109	08/2035	$509.18	$1,178.53	$100,657.29
110	09/2035	$503.29	$1,184.43	$99,472.86
111	10/2035	$497.36	$1,190.35	$98,282.51
112	11/2035	$491.41	$1,196.30	$97,086.21
113	12/2035	$485.43	$1,202.28	$95,883.93
114	01/2036	$479.42	$1,208.29	$94,675.63
115	02/2036	$473.38	$1,214.34	$93,461.30
116	03/2036	$467.31	$1,220.41	$92,240.89
117	04/2036	$461.20	$1,226.51	$91,014.38
118	05/2036	$455.07	$1,232.64	$89,781.74
119	06/2036	$448.91	$1,238.80	$88,542.93
120	07/2036	$442.71	$1,245.00	$87,297.94
121	08/2036	$436.49	$1,251.22	$86,046.71
122	09/2036	$430.23	$1,257.48	$84,789.23
123	10/2036	$423.95	$1,263.77	$83,525.46
124	11/2036	$417.63	$1,270.09	$82,255.38
125	12/2036	$411.28	$1,276.44	$80,978.94
126	01/2037	$404.89	$1,282.82	$79,696.12
127	02/2037	$398.48	$1,289.23	$78,406.89
128	03/2037	$392.03	$1,295.68	$77,111.21
129	04/2037	$385.56	$1,302.16	$75,809.05
130	05/2037	$379.05	$1,308.67	$74,500.38
131	06/2037	$372.50	$1,315.21	$73,185.17
132	07/2037	$365.93	$1,321.79	$71,863.38
133	08/2037	$359.32	$1,328.40	$70,534.99
134	09/2037	$352.67	$1,335.04	$69,199.95
135	10/2037	$346.00	$1,341.71	$67,858.23
136	11/2037	$339.29	$1,348.42	$66,509.81
137	12/2037	$332.55	$1,355.16	$65,154.65
138	01/2038	$325.77	$1,361.94	$63,792.71
139	02/2038	$318.96	$1,368.75	$62,423.96
140	03/2038	$312.12	$1,375.59	$61,048.36
141	04/2038	$305.24	$1,382.47	$59,665.89
142	05/2038	$298.33	$1,389.38	$58,276.51
143	06/2038	$291.38	$1,396.33	$56,880.18
144	07/2038	$284.40	$1,403.31	$55,476.86
145	08/2038	$277.38	$1,410.33	$54,066.53
146	09/2038	$270.33	$1,417.38	$52,649.15
147	10/2038	$263.25	$1,424.47	$51,224.68
148	11/2038	$256.12	$1,431.59	$49,793.09
149	12/2038	$248.97	$1,438.75	$48,354.35
150	01/2039	$241.77	$1,445.94	$46,908.40
151	02/2039	$234.54	$1,453.17	$45,455.23
152	03/2039	$227.28	$1,460.44	$43,994.80
153	04/2039	$219.97	$1,467.74	$42,527.06
154	05/2039	$212.64	$1,475.08	$41,051.98
155	06/2039	$205.26	$1,482.45	$39,569.52
156	07/2039	$197.85	$1,489.87	$38,079.66
157	08/2039	$190.40	$1,497.32	$36,582.34
158	09/2039	$182.91	$1,504.80	$35,077.54
159	10/2039	$175.39	$1,512.33	$33,565.21
160	11/2039	$167.83	$1,519.89	$32,045.33
161	12/2039	$160.23	$1,527.49	$30,517.84
162	01/2040	$152.59	$1,535.12	$28,982.72
163	02/2040	$144.91	$1,542.80	$27,439.92
164	03/2040	$137.20	$1,550.51	$25,889.40
165	04/2040	$129.45	$1,558.27	$24,331.13
166	05/2040	$121.66	$1,566.06	$22,765.08
167	06/2040	$113.83	$1,573.89	$21,191.19
168	07/2040	$105.96	$1,581.76	$19,609.43
169	08/2040	$98.05	$1,589.67	$18,019.76
170	09/2040	$90.10	$1,597.61	$16,422.15
171	10/2040	$82.11	$1,605.60	$14,816.55
172	11/2040	$74.08	$1,613.63	$13,202.92
173	12/2040	$66.01	$1,621.70	$11,581.22
174	01/2041	$57.91	$1,629.81	$9,951.41
175	02/2041	$49.76	$1,637.96	$8,313.45
176	03/2041	$41.57	$1,646.15	$6,667.31
177	04/2041	$33.34	$1,654.38	$5,012.93
178	05/2041	$25.06	$1,662.65	$3,350.28
179	06/2041	$16.75	$1,670.96	$1,679.32
180	07/2041	$8.40	$1,679.32	$0.00

THE NUMORIX GUIDE

How to use the Amortization calculator

Last reviewed September 14, 2026

What this calculator does

The engine computes a regular monthly payment from the loan amount, monthly rate, and total months.

Formula and method

The engine computes a regular monthly payment from the loan amount, monthly rate, and total months. For every row it charges interest on the opening balance, applies the regular principal, then adds extra monthly, yearly, and one-time amounts subject to the remaining balance. The start month is used to label each row as month/year.

Variables and inputs

Enter loan amount, years, additional months, annual interest rate, a loan start month, extra monthly pay, extra yearly pay, extra one-time pay, and the month for the one-time payment. Monetary inputs are dollars; years and months determine the term; rates are percentages.

Worked example

For a $10,000 loan at 12% for 2 years, the monthly rate is 0.12 / 12 = 0.01 and the regular payment is 10000 x 0.01 x 1.01^24 / (1.01^24 - 1) = about $470.73. In month 1, interest is $100.00 and base principal is about $370.73; adding $100 extra reduces the balance by about $470.73, leaving about $9,529.27.

How to interpret the result

The schedule shows how extra payments alter the payoff path and interest total. Extra money is applied to principal after the regular payment, so it can shorten the schedule. The payoff date is the last generated month, not a lender-confirmed maturity date.

Common mistakes to avoid

Enter additional months separately from years. Make the one-time payment month a month number in the schedule, not a calendar month. Do not assume an extra payment reduces the scheduled monthly payment; this engine keeps the regular payment and applies extra principal.

Assumptions and limitations

The model assumes a fixed rate, monthly payment cycle, and immediate principal application. It excludes escrow, fees, daily-interest conventions, rate changes, lender prepayment restrictions, and rounding at each contractual payment. The total includes extra principal as cash paid, so compare interest separately from total cash outflow.

Sources and references

COMMON QUESTIONS

Frequently asked questions

How does an extra payment change the schedule?

The regular payment is calculated first. Any entered extra monthly, yearly, or one-time amount is then applied to principal, reducing the balance on which later interest is calculated.

Why does the start date matter if interest is monthly?

It labels the generated rows and payoff date. The numeric payment model still uses a fixed number of monthly periods rather than day-count interest.

Why can total cash paid include extra principal?

Principal is still money paid even though it is not interest. The result reports the full amount returned to the lender, while the separate interest value shows the borrowing cost.

FROM THE NUMORIX GUIDES

Learn more before you decide

How to Read an Amortization Schedule