Interest-Only Mortgage Calculator

Estimate the initial interest-only bill and the later payment needed to repay the balance.

Your estimate

Interest-only monthly payment: $1,733.33
Monthly payment during repayment: $2,160.66
Balance after interest-only period: $320,000.00
Total interest: $432,198.87

Repayment period

Starting values are illustrative, not live quotes. Rate and balance are held constant during the interest-only period, followed by amortization over the remaining term. The chart starts at repayment. Actual adjustable-rate contracts can differ.

Payment schedule

Payment schedule
Month	Payment	Principal	Interest	Balance
1	$2,160.66	$427.33	$1,733.33	$319,572.67
2	$2,160.66	$429.64	$1,731.02	$319,143.03
3	$2,160.66	$431.97	$1,728.69	$318,711.05
4	$2,160.66	$434.31	$1,726.35	$318,276.74
5	$2,160.66	$436.66	$1,724.00	$317,840.08
6	$2,160.66	$439.03	$1,721.63	$317,401.05
7	$2,160.66	$441.41	$1,719.26	$316,959.64
8	$2,160.66	$443.80	$1,716.86	$316,515.84
9	$2,160.66	$446.20	$1,714.46	$316,069.64
10	$2,160.66	$448.62	$1,712.04	$315,621.02
11	$2,160.66	$451.05	$1,709.61	$315,169.97
12	$2,160.66	$453.49	$1,707.17	$314,716.48
13	$2,160.66	$455.95	$1,704.71	$314,260.53
14	$2,160.66	$458.42	$1,702.24	$313,802.12
15	$2,160.66	$460.90	$1,699.76	$313,341.21
16	$2,160.66	$463.40	$1,697.26	$312,877.82
17	$2,160.66	$465.91	$1,694.75	$312,411.91
18	$2,160.66	$468.43	$1,692.23	$311,943.48
19	$2,160.66	$470.97	$1,689.69	$311,472.51
20	$2,160.66	$473.52	$1,687.14	$310,998.99
21	$2,160.66	$476.09	$1,684.58	$310,522.90
22	$2,160.66	$478.66	$1,682.00	$310,044.24
23	$2,160.66	$481.26	$1,679.41	$309,562.98
24	$2,160.66	$483.86	$1,676.80	$309,079.12
25	$2,160.66	$486.48	$1,674.18	$308,592.63
26	$2,160.66	$489.12	$1,671.54	$308,103.51
27	$2,160.66	$491.77	$1,668.89	$307,611.75
28	$2,160.66	$494.43	$1,666.23	$307,117.31
29	$2,160.66	$497.11	$1,663.55	$306,620.20
30	$2,160.66	$499.80	$1,660.86	$306,120.40
31	$2,160.66	$502.51	$1,658.15	$305,617.89
32	$2,160.66	$505.23	$1,655.43	$305,112.65
33	$2,160.66	$507.97	$1,652.69	$304,604.69
34	$2,160.66	$510.72	$1,649.94	$304,093.96
35	$2,160.66	$513.49	$1,647.18	$303,580.48
36	$2,160.66	$516.27	$1,644.39	$303,064.21
37	$2,160.66	$519.07	$1,641.60	$302,545.14
38	$2,160.66	$521.88	$1,638.79	$302,023.27
39	$2,160.66	$524.70	$1,635.96	$301,498.56
40	$2,160.66	$527.55	$1,633.12	$300,971.02
41	$2,160.66	$530.40	$1,630.26	$300,440.61
42	$2,160.66	$533.28	$1,627.39	$299,907.34
43	$2,160.66	$536.16	$1,624.50	$299,371.17
44	$2,160.66	$539.07	$1,621.59	$298,832.10
45	$2,160.66	$541.99	$1,618.67	$298,290.12
46	$2,160.66	$544.92	$1,615.74	$297,745.19
47	$2,160.66	$547.88	$1,612.79	$297,197.31
48	$2,160.66	$550.84	$1,609.82	$296,646.47
49	$2,160.66	$553.83	$1,606.84	$296,092.64
50	$2,160.66	$556.83	$1,603.84	$295,535.81
51	$2,160.66	$559.84	$1,600.82	$294,975.97
52	$2,160.66	$562.88	$1,597.79	$294,413.09
53	$2,160.66	$565.93	$1,594.74	$293,847.17
54	$2,160.66	$568.99	$1,591.67	$293,278.18
55	$2,160.66	$572.07	$1,588.59	$292,706.10
56	$2,160.66	$575.17	$1,585.49	$292,130.93
57	$2,160.66	$578.29	$1,582.38	$291,552.65
58	$2,160.66	$581.42	$1,579.24	$290,971.23
59	$2,160.66	$584.57	$1,576.09	$290,386.66
60	$2,160.66	$587.74	$1,572.93	$289,798.92
61	$2,160.66	$590.92	$1,569.74	$289,208.00
62	$2,160.66	$594.12	$1,566.54	$288,613.88
63	$2,160.66	$597.34	$1,563.33	$288,016.55
64	$2,160.66	$600.57	$1,560.09	$287,415.97
65	$2,160.66	$603.83	$1,556.84	$286,812.15
66	$2,160.66	$607.10	$1,553.57	$286,205.05
67	$2,160.66	$610.39	$1,550.28	$285,594.66
68	$2,160.66	$613.69	$1,546.97	$284,980.97
69	$2,160.66	$617.02	$1,543.65	$284,363.96
70	$2,160.66	$620.36	$1,540.30	$283,743.60
71	$2,160.66	$623.72	$1,536.94	$283,119.88
72	$2,160.66	$627.10	$1,533.57	$282,492.78
73	$2,160.66	$630.49	$1,530.17	$281,862.29
74	$2,160.66	$633.91	$1,526.75	$281,228.38
75	$2,160.66	$637.34	$1,523.32	$280,591.04
76	$2,160.66	$640.79	$1,519.87	$279,950.24
77	$2,160.66	$644.27	$1,516.40	$279,305.98
78	$2,160.66	$647.76	$1,512.91	$278,658.22
79	$2,160.66	$651.26	$1,509.40	$278,006.96
80	$2,160.66	$654.79	$1,505.87	$277,352.17
81	$2,160.66	$658.34	$1,502.32	$276,693.83
82	$2,160.66	$661.90	$1,498.76	$276,031.92
83	$2,160.66	$665.49	$1,495.17	$275,366.43
84	$2,160.66	$669.09	$1,491.57	$274,697.34
85	$2,160.66	$672.72	$1,487.94	$274,024.62
86	$2,160.66	$676.36	$1,484.30	$273,348.26
87	$2,160.66	$680.03	$1,480.64	$272,668.23
88	$2,160.66	$683.71	$1,476.95	$271,984.52
89	$2,160.66	$687.41	$1,473.25	$271,297.11
90	$2,160.66	$691.14	$1,469.53	$270,605.97
91	$2,160.66	$694.88	$1,465.78	$269,911.09
92	$2,160.66	$698.64	$1,462.02	$269,212.44
93	$2,160.66	$702.43	$1,458.23	$268,510.02
94	$2,160.66	$706.23	$1,454.43	$267,803.78
95	$2,160.66	$710.06	$1,450.60	$267,093.72
96	$2,160.66	$713.91	$1,446.76	$266,379.82
97	$2,160.66	$717.77	$1,442.89	$265,662.04
98	$2,160.66	$721.66	$1,439.00	$264,940.38
99	$2,160.66	$725.57	$1,435.09	$264,214.82
100	$2,160.66	$729.50	$1,431.16	$263,485.32
101	$2,160.66	$733.45	$1,427.21	$262,751.87
102	$2,160.66	$737.42	$1,423.24	$262,014.44
103	$2,160.66	$741.42	$1,419.24	$261,273.02
104	$2,160.66	$745.43	$1,415.23	$260,527.59
105	$2,160.66	$749.47	$1,411.19	$259,778.12
106	$2,160.66	$753.53	$1,407.13	$259,024.59
107	$2,160.66	$757.61	$1,403.05	$258,266.97
108	$2,160.66	$761.72	$1,398.95	$257,505.26
109	$2,160.66	$765.84	$1,394.82	$256,739.41
110	$2,160.66	$769.99	$1,390.67	$255,969.42
111	$2,160.66	$774.16	$1,386.50	$255,195.26
112	$2,160.66	$778.36	$1,382.31	$254,416.91
113	$2,160.66	$782.57	$1,378.09	$253,634.33
114	$2,160.66	$786.81	$1,373.85	$252,847.52
115	$2,160.66	$791.07	$1,369.59	$252,056.45
116	$2,160.66	$795.36	$1,365.31	$251,261.09
117	$2,160.66	$799.67	$1,361.00	$250,461.43
118	$2,160.66	$804.00	$1,356.67	$249,657.43
119	$2,160.66	$808.35	$1,352.31	$248,849.08
120	$2,160.66	$812.73	$1,347.93	$248,036.35
121	$2,160.66	$817.13	$1,343.53	$247,219.22
122	$2,160.66	$821.56	$1,339.10	$246,397.66
123	$2,160.66	$826.01	$1,334.65	$245,571.65
124	$2,160.66	$830.48	$1,330.18	$244,741.17
125	$2,160.66	$834.98	$1,325.68	$243,906.19
126	$2,160.66	$839.50	$1,321.16	$243,066.68
127	$2,160.66	$844.05	$1,316.61	$242,222.63
128	$2,160.66	$848.62	$1,312.04	$241,374.01
129	$2,160.66	$853.22	$1,307.44	$240,520.78
130	$2,160.66	$857.84	$1,302.82	$239,662.94
131	$2,160.66	$862.49	$1,298.17	$238,800.45
132	$2,160.66	$867.16	$1,293.50	$237,933.29
133	$2,160.66	$871.86	$1,288.81	$237,061.44
134	$2,160.66	$876.58	$1,284.08	$236,184.86
135	$2,160.66	$881.33	$1,279.33	$235,303.53
136	$2,160.66	$886.10	$1,274.56	$234,417.43
137	$2,160.66	$890.90	$1,269.76	$233,526.52
138	$2,160.66	$895.73	$1,264.94	$232,630.80
139	$2,160.66	$900.58	$1,260.08	$231,730.22
140	$2,160.66	$905.46	$1,255.21	$230,824.76
141	$2,160.66	$910.36	$1,250.30	$229,914.40
142	$2,160.66	$915.29	$1,245.37	$228,999.10
143	$2,160.66	$920.25	$1,240.41	$228,078.85
144	$2,160.66	$925.24	$1,235.43	$227,153.62
145	$2,160.66	$930.25	$1,230.42	$226,223.37
146	$2,160.66	$935.29	$1,225.38	$225,288.08
147	$2,160.66	$940.35	$1,220.31	$224,347.73
148	$2,160.66	$945.45	$1,215.22	$223,402.28
149	$2,160.66	$950.57	$1,210.10	$222,451.72
150	$2,160.66	$955.72	$1,204.95	$221,496.00
151	$2,160.66	$960.89	$1,199.77	$220,535.11
152	$2,160.66	$966.10	$1,194.57	$219,569.01
153	$2,160.66	$971.33	$1,189.33	$218,597.68
154	$2,160.66	$976.59	$1,184.07	$217,621.09
155	$2,160.66	$981.88	$1,178.78	$216,639.21
156	$2,160.66	$987.20	$1,173.46	$215,652.01
157	$2,160.66	$992.55	$1,168.12	$214,659.46
158	$2,160.66	$997.92	$1,162.74	$213,661.53
159	$2,160.66	$1,003.33	$1,157.33	$212,658.20
160	$2,160.66	$1,008.76	$1,151.90	$211,649.44
161	$2,160.66	$1,014.23	$1,146.43	$210,635.21
162	$2,160.66	$1,019.72	$1,140.94	$209,615.49
163	$2,160.66	$1,025.25	$1,135.42	$208,590.24
164	$2,160.66	$1,030.80	$1,129.86	$207,559.44
165	$2,160.66	$1,036.38	$1,124.28	$206,523.06
166	$2,160.66	$1,042.00	$1,118.67	$205,481.06
167	$2,160.66	$1,047.64	$1,113.02	$204,433.42
168	$2,160.66	$1,053.32	$1,107.35	$203,380.11
169	$2,160.66	$1,059.02	$1,101.64	$202,321.09
170	$2,160.66	$1,064.76	$1,095.91	$201,256.33
171	$2,160.66	$1,070.52	$1,090.14	$200,185.81
172	$2,160.66	$1,076.32	$1,084.34	$199,109.48
173	$2,160.66	$1,082.15	$1,078.51	$198,027.33
174	$2,160.66	$1,088.01	$1,072.65	$196,939.32
175	$2,160.66	$1,093.91	$1,066.75	$195,845.41
176	$2,160.66	$1,099.83	$1,060.83	$194,745.57
177	$2,160.66	$1,105.79	$1,054.87	$193,639.78
178	$2,160.66	$1,111.78	$1,048.88	$192,528.00
179	$2,160.66	$1,117.80	$1,042.86	$191,410.20
180	$2,160.66	$1,123.86	$1,036.81	$190,286.34
181	$2,160.66	$1,129.95	$1,030.72	$189,156.40
182	$2,160.66	$1,136.07	$1,024.60	$188,020.33
183	$2,160.66	$1,142.22	$1,018.44	$186,878.11
184	$2,160.66	$1,148.41	$1,012.26	$185,729.70
185	$2,160.66	$1,154.63	$1,006.04	$184,575.08
186	$2,160.66	$1,160.88	$999.78	$183,414.20
187	$2,160.66	$1,167.17	$993.49	$182,247.03
188	$2,160.66	$1,173.49	$987.17	$181,073.54
189	$2,160.66	$1,179.85	$980.81	$179,893.69
190	$2,160.66	$1,186.24	$974.42	$178,707.45
191	$2,160.66	$1,192.66	$968.00	$177,514.78
192	$2,160.66	$1,199.12	$961.54	$176,315.66
193	$2,160.66	$1,205.62	$955.04	$175,110.04
194	$2,160.66	$1,212.15	$948.51	$173,897.89
195	$2,160.66	$1,218.72	$941.95	$172,679.17
196	$2,160.66	$1,225.32	$935.35	$171,453.86
197	$2,160.66	$1,231.95	$928.71	$170,221.90
198	$2,160.66	$1,238.63	$922.04	$168,983.27
199	$2,160.66	$1,245.34	$915.33	$167,737.94
200	$2,160.66	$1,252.08	$908.58	$166,485.86
201	$2,160.66	$1,258.86	$901.80	$165,226.99
202	$2,160.66	$1,265.68	$894.98	$163,961.31
203	$2,160.66	$1,272.54	$888.12	$162,688.77
204	$2,160.66	$1,279.43	$881.23	$161,409.34
205	$2,160.66	$1,286.36	$874.30	$160,122.97
206	$2,160.66	$1,293.33	$867.33	$158,829.64
207	$2,160.66	$1,300.34	$860.33	$157,529.31
208	$2,160.66	$1,307.38	$853.28	$156,221.93
209	$2,160.66	$1,314.46	$846.20	$154,907.47
210	$2,160.66	$1,321.58	$839.08	$153,585.89
211	$2,160.66	$1,328.74	$831.92	$152,257.15
212	$2,160.66	$1,335.94	$824.73	$150,921.21
213	$2,160.66	$1,343.17	$817.49	$149,578.04
214	$2,160.66	$1,350.45	$810.21	$148,227.59
215	$2,160.66	$1,357.76	$802.90	$146,869.83
216	$2,160.66	$1,365.12	$795.54	$145,504.71
217	$2,160.66	$1,372.51	$788.15	$144,132.20
218	$2,160.66	$1,379.95	$780.72	$142,752.25
219	$2,160.66	$1,387.42	$773.24	$141,364.83
220	$2,160.66	$1,394.94	$765.73	$139,969.89
221	$2,160.66	$1,402.49	$758.17	$138,567.40
222	$2,160.66	$1,410.09	$750.57	$137,157.31
223	$2,160.66	$1,417.73	$742.94	$135,739.58
224	$2,160.66	$1,425.41	$735.26	$134,314.17
225	$2,160.66	$1,433.13	$727.54	$132,881.05
226	$2,160.66	$1,440.89	$719.77	$131,440.16
227	$2,160.66	$1,448.70	$711.97	$129,991.46
228	$2,160.66	$1,456.54	$704.12	$128,534.92
229	$2,160.66	$1,464.43	$696.23	$127,070.49
230	$2,160.66	$1,472.36	$688.30	$125,598.12
231	$2,160.66	$1,480.34	$680.32	$124,117.78
232	$2,160.66	$1,488.36	$672.30	$122,629.42
233	$2,160.66	$1,496.42	$664.24	$121,133.00
234	$2,160.66	$1,504.53	$656.14	$119,628.48
235	$2,160.66	$1,512.68	$647.99	$118,115.80
236	$2,160.66	$1,520.87	$639.79	$116,594.93
237	$2,160.66	$1,529.11	$631.56	$115,065.83
238	$2,160.66	$1,537.39	$623.27	$113,528.44
239	$2,160.66	$1,545.72	$614.95	$111,982.72
240	$2,160.66	$1,554.09	$606.57	$110,428.63
241	$2,160.66	$1,562.51	$598.16	$108,866.12
242	$2,160.66	$1,570.97	$589.69	$107,295.15
243	$2,160.66	$1,579.48	$581.18	$105,715.67
244	$2,160.66	$1,588.04	$572.63	$104,127.63
245	$2,160.66	$1,596.64	$564.02	$102,530.99
246	$2,160.66	$1,605.29	$555.38	$100,925.71
247	$2,160.66	$1,613.98	$546.68	$99,311.73
248	$2,160.66	$1,622.72	$537.94	$97,689.00
249	$2,160.66	$1,631.51	$529.15	$96,057.49
250	$2,160.66	$1,640.35	$520.31	$94,417.14
251	$2,160.66	$1,649.24	$511.43	$92,767.90
252	$2,160.66	$1,658.17	$502.49	$91,109.73
253	$2,160.66	$1,667.15	$493.51	$89,442.58
254	$2,160.66	$1,676.18	$484.48	$87,766.39
255	$2,160.66	$1,685.26	$475.40	$86,081.13
256	$2,160.66	$1,694.39	$466.27	$84,386.74
257	$2,160.66	$1,703.57	$457.09	$82,683.17
258	$2,160.66	$1,712.80	$447.87	$80,970.38
259	$2,160.66	$1,722.07	$438.59	$79,248.31
260	$2,160.66	$1,731.40	$429.26	$77,516.90
261	$2,160.66	$1,740.78	$419.88	$75,776.12
262	$2,160.66	$1,750.21	$410.45	$74,025.92
263	$2,160.66	$1,759.69	$400.97	$72,266.23
264	$2,160.66	$1,769.22	$391.44	$70,497.01
265	$2,160.66	$1,778.80	$381.86	$68,718.20
266	$2,160.66	$1,788.44	$372.22	$66,929.76
267	$2,160.66	$1,798.13	$362.54	$65,131.64
268	$2,160.66	$1,807.87	$352.80	$63,323.77
269	$2,160.66	$1,817.66	$343.00	$61,506.11
270	$2,160.66	$1,827.50	$333.16	$59,678.60
271	$2,160.66	$1,837.40	$323.26	$57,841.20
272	$2,160.66	$1,847.36	$313.31	$55,993.84
273	$2,160.66	$1,857.36	$303.30	$54,136.48
274	$2,160.66	$1,867.42	$293.24	$52,269.06
275	$2,160.66	$1,877.54	$283.12	$50,391.52
276	$2,160.66	$1,887.71	$272.95	$48,503.81
277	$2,160.66	$1,897.93	$262.73	$46,605.88
278	$2,160.66	$1,908.21	$252.45	$44,697.66
279	$2,160.66	$1,918.55	$242.11	$42,779.11
280	$2,160.66	$1,928.94	$231.72	$40,850.17
281	$2,160.66	$1,939.39	$221.27	$38,910.78
282	$2,160.66	$1,949.90	$210.77	$36,960.88
283	$2,160.66	$1,960.46	$200.20	$35,000.42
284	$2,160.66	$1,971.08	$189.59	$33,029.35
285	$2,160.66	$1,981.75	$178.91	$31,047.59
286	$2,160.66	$1,992.49	$168.17	$29,055.10
287	$2,160.66	$2,003.28	$157.38	$27,051.82
288	$2,160.66	$2,014.13	$146.53	$25,037.69
289	$2,160.66	$2,025.04	$135.62	$23,012.65
290	$2,160.66	$2,036.01	$124.65	$20,976.64
291	$2,160.66	$2,047.04	$113.62	$18,929.60
292	$2,160.66	$2,058.13	$102.54	$16,871.47
293	$2,160.66	$2,069.28	$91.39	$14,802.19
294	$2,160.66	$2,080.48	$80.18	$12,721.71
295	$2,160.66	$2,091.75	$68.91	$10,629.96
296	$2,160.66	$2,103.08	$57.58	$8,526.87
297	$2,160.66	$2,114.48	$46.19	$6,412.40
298	$2,160.66	$2,125.93	$34.73	$4,286.47
299	$2,160.66	$2,137.44	$23.22	$2,149.02
300	$2,160.66	$2,149.02	$11.64	$0.00

Updated September 9, 2026

How to use

Replace the example inputs with your loan and property figures.
Select Calculate to update the estimate and any schedule.
Change one assumption at a time, then compare the result with the earlier scenario.

How this calculation works

During the selected interest-only period, each payment covers monthly interest and leaves the principal unchanged. After that period, the entire balance is amortized over the remaining months at the entered rate.

Interest-only payment = principal × annual rate ÷ 12

Worked example

Illustrative inputs — not a quote or a local average.

Loan balance: $320,000.00
Interest rate: 6.5 %
Loan term: 30 years
Interest-only period: 5 years

Interest-only monthly payment: $1,733.33. Monthly payment during repayment: $2,160.66. Balance after interest-only period: $320,000.00.

Reading the result

The payment increase shows the effect of starting principal repayment with less time left. The balance after the interest-only period is deliberately unchanged. The chart begins at the repayment phase, so it should not be read as if principal was declining during the earlier phase.

Before acting on the estimate

This is a constant-rate illustration. An adjustable-rate loan can also change the interest rate at or before repayment, producing a different increase. Check the contract’s reset terms and whether the balance is amortized or due as a balloon.