HELOC Calculator

Estimate interest-only HELOC payments followed by amortizing repayment of a fixed drawn balance.

Balance over the schedule

Each point corresponds to one row of the calculated schedule. Use the table for exact displayed values.

Inspect point: 1

Balance: $49,855.51

Principal and interest by payment

Principal reduces the balance; interest is the borrowing charge for that payment period.

Inspect point: 1

Principal: $144.49
Interest: $333.33

Amortization schedule

Values are rounded for this schedule; calculations retain full precision until display. Download the CSV to use the complete table.

Amortization schedule
Month	Payment	Interest	Principal	Balance
1	$477.83	$333.33	$144.49	$49,855.51
2	$477.83	$332.37	$145.46	$49,710.05
3	$477.83	$331.40	$146.43	$49,563.63
4	$477.83	$330.42	$147.40	$49,416.22
5	$477.83	$329.44	$148.38	$49,267.84
6	$477.83	$328.45	$149.37	$49,118.47
7	$477.83	$327.46	$150.37	$48,968.10
8	$477.83	$326.45	$151.37	$48,816.72
9	$477.83	$325.44	$152.38	$48,664.34
10	$477.83	$324.43	$153.40	$48,510.95
11	$477.83	$323.41	$154.42	$48,356.53
12	$477.83	$322.38	$155.45	$48,201.08
1	$477.83	$333.33	$144.49	$49,855.51
2	$477.83	$332.37	$145.46	$49,710.05
3	$477.83	$331.40	$146.43	$49,563.63
4	$477.83	$330.42	$147.40	$49,416.22
5	$477.83	$329.44	$148.38	$49,267.84
6	$477.83	$328.45	$149.37	$49,118.47
7	$477.83	$327.46	$150.37	$48,968.10
8	$477.83	$326.45	$151.37	$48,816.72
9	$477.83	$325.44	$152.38	$48,664.34
10	$477.83	$324.43	$153.40	$48,510.95
11	$477.83	$323.41	$154.42	$48,356.53
12	$477.83	$322.38	$155.45	$48,201.08
13	$477.83	$321.34	$156.49	$48,044.59
14	$477.83	$320.30	$157.53	$47,887.06
15	$477.83	$319.25	$158.58	$47,728.48
16	$477.83	$318.19	$159.64	$47,568.85
17	$477.83	$317.13	$160.70	$47,408.15
18	$477.83	$316.05	$161.77	$47,246.37
19	$477.83	$314.98	$162.85	$47,083.52
20	$477.83	$313.89	$163.94	$46,919.59
21	$477.83	$312.80	$165.03	$46,754.56
22	$477.83	$311.70	$166.13	$46,588.43
23	$477.83	$310.59	$167.24	$46,421.19
24	$477.83	$309.47	$168.35	$46,252.84
25	$477.83	$308.35	$169.47	$46,083.37
26	$477.83	$307.22	$170.60	$45,912.77
27	$477.83	$306.09	$171.74	$45,741.02
28	$477.83	$304.94	$172.89	$45,568.14
29	$477.83	$303.79	$174.04	$45,394.10
30	$477.83	$302.63	$175.20	$45,218.90
31	$477.83	$301.46	$176.37	$45,042.54
32	$477.83	$300.28	$177.54	$44,864.99
33	$477.83	$299.10	$178.73	$44,686.27
34	$477.83	$297.91	$179.92	$44,506.35
35	$477.83	$296.71	$181.12	$44,325.23
36	$477.83	$295.50	$182.32	$44,142.91
37	$477.83	$294.29	$183.54	$43,959.37
38	$477.83	$293.06	$184.76	$43,774.60
39	$477.83	$291.83	$186.00	$43,588.61
40	$477.83	$290.59	$187.24	$43,401.37
41	$477.83	$289.34	$188.48	$43,212.89
42	$477.83	$288.09	$189.74	$43,023.15
43	$477.83	$286.82	$191.01	$42,832.14
44	$477.83	$285.55	$192.28	$42,639.87
45	$477.83	$284.27	$193.56	$42,446.31
46	$477.83	$282.98	$194.85	$42,251.46
47	$477.83	$281.68	$196.15	$42,055.31
48	$477.83	$280.37	$197.46	$41,857.85
49	$477.83	$279.05	$198.77	$41,659.07
50	$477.83	$277.73	$200.10	$41,458.98
51	$477.83	$276.39	$201.43	$41,257.54
52	$477.83	$275.05	$202.78	$41,054.77
53	$477.83	$273.70	$204.13	$40,850.64
54	$477.83	$272.34	$205.49	$40,645.15
55	$477.83	$270.97	$206.86	$40,438.29
56	$477.83	$269.59	$208.24	$40,230.06
57	$477.83	$268.20	$209.63	$40,020.43
58	$477.83	$266.80	$211.02	$39,809.41
59	$477.83	$265.40	$212.43	$39,596.98
60	$477.83	$263.98	$213.85	$39,383.13
61	$477.83	$262.55	$215.27	$39,167.86
62	$477.83	$261.12	$216.71	$38,951.15
63	$477.83	$259.67	$218.15	$38,733.00
64	$477.83	$258.22	$219.61	$38,513.39
65	$477.83	$256.76	$221.07	$38,292.32
66	$477.83	$255.28	$222.54	$38,069.78
67	$477.83	$253.80	$224.03	$37,845.75
68	$477.83	$252.31	$225.52	$37,620.23
69	$477.83	$250.80	$227.02	$37,393.21
70	$477.83	$249.29	$228.54	$37,164.67
71	$477.83	$247.76	$230.06	$36,934.61
72	$477.83	$246.23	$231.60	$36,703.01
73	$477.83	$244.69	$233.14	$36,469.87
74	$477.83	$243.13	$234.69	$36,235.18
75	$477.83	$241.57	$236.26	$35,998.92
76	$477.83	$239.99	$237.83	$35,761.09
77	$477.83	$238.41	$239.42	$35,521.67
78	$477.83	$236.81	$241.01	$35,280.65
79	$477.83	$235.20	$242.62	$35,038.03
80	$477.83	$233.59	$244.24	$34,793.79
81	$477.83	$231.96	$245.87	$34,547.93
82	$477.83	$230.32	$247.51	$34,300.42
83	$477.83	$228.67	$249.16	$34,051.26
84	$477.83	$227.01	$250.82	$33,800.44
85	$477.83	$225.34	$252.49	$33,547.95
86	$477.83	$223.65	$254.17	$33,293.78
87	$477.83	$221.96	$255.87	$33,037.91
88	$477.83	$220.25	$257.57	$32,780.34
89	$477.83	$218.54	$259.29	$32,521.05
90	$477.83	$216.81	$261.02	$32,260.03
91	$477.83	$215.07	$262.76	$31,997.27
92	$477.83	$213.32	$264.51	$31,732.76
93	$477.83	$211.55	$266.27	$31,466.49
94	$477.83	$209.78	$268.05	$31,198.44
95	$477.83	$207.99	$269.84	$30,928.60
96	$477.83	$206.19	$271.64	$30,656.97
97	$477.83	$204.38	$273.45	$30,383.52
98	$477.83	$202.56	$275.27	$30,108.25
99	$477.83	$200.72	$277.10	$29,831.15
100	$477.83	$198.87	$278.95	$29,552.19
101	$477.83	$197.01	$280.81	$29,271.38
102	$477.83	$195.14	$282.68	$28,988.70
103	$477.83	$193.26	$284.57	$28,704.13
104	$477.83	$191.36	$286.47	$28,417.67
105	$477.83	$189.45	$288.37	$28,129.29
106	$477.83	$187.53	$290.30	$27,838.99
107	$477.83	$185.59	$292.23	$27,546.76
108	$477.83	$183.65	$294.18	$27,252.58
109	$477.83	$181.68	$296.14	$26,956.44
110	$477.83	$179.71	$298.12	$26,658.32
111	$477.83	$177.72	$300.10	$26,358.22
112	$477.83	$175.72	$302.10	$26,056.11
113	$477.83	$173.71	$304.12	$25,751.99
114	$477.83	$171.68	$306.15	$25,445.85
115	$477.83	$169.64	$308.19	$25,137.66
116	$477.83	$167.58	$310.24	$24,827.42
117	$477.83	$165.52	$312.31	$24,515.11
118	$477.83	$163.43	$314.39	$24,200.72
119	$477.83	$161.34	$316.49	$23,884.23
120	$477.83	$159.23	$318.60	$23,565.63
121	$477.83	$157.10	$320.72	$23,244.91
122	$477.83	$154.97	$322.86	$22,922.05
123	$477.83	$152.81	$325.01	$22,597.04
124	$477.83	$150.65	$327.18	$22,269.86
125	$477.83	$148.47	$329.36	$21,940.50
126	$477.83	$146.27	$331.56	$21,608.94
127	$477.83	$144.06	$333.77	$21,275.18
128	$477.83	$141.83	$335.99	$20,939.18
129	$477.83	$139.59	$338.23	$20,600.95
130	$477.83	$137.34	$340.49	$20,260.47
131	$477.83	$135.07	$342.76	$19,917.71
132	$477.83	$132.78	$345.04	$19,572.67
133	$477.83	$130.48	$347.34	$19,225.33
134	$477.83	$128.17	$349.66	$18,875.67
135	$477.83	$125.84	$351.99	$18,523.68
136	$477.83	$123.49	$354.33	$18,169.35
137	$477.83	$121.13	$356.70	$17,812.65
138	$477.83	$118.75	$359.08	$17,453.57
139	$477.83	$116.36	$361.47	$17,092.11
140	$477.83	$113.95	$363.88	$16,728.23
141	$477.83	$111.52	$366.30	$16,361.92
142	$477.83	$109.08	$368.75	$15,993.18
143	$477.83	$106.62	$371.20	$15,621.97
144	$477.83	$104.15	$373.68	$15,248.29
145	$477.83	$101.66	$376.17	$14,872.12
146	$477.83	$99.15	$378.68	$14,493.44
147	$477.83	$96.62	$381.20	$14,112.24
148	$477.83	$94.08	$383.74	$13,728.49
149	$477.83	$91.52	$386.30	$13,342.19
150	$477.83	$88.95	$388.88	$12,953.31
151	$477.83	$86.36	$391.47	$12,561.84
152	$477.83	$83.75	$394.08	$12,167.76
153	$477.83	$81.12	$396.71	$11,771.06
154	$477.83	$78.47	$399.35	$11,371.70
155	$477.83	$75.81	$402.01	$10,969.69
156	$477.83	$73.13	$404.69	$10,564.99
157	$477.83	$70.43	$407.39	$10,157.60
158	$477.83	$67.72	$410.11	$9,747.49
159	$477.83	$64.98	$412.84	$9,334.65
160	$477.83	$62.23	$415.60	$8,919.05
161	$477.83	$59.46	$418.37	$8,500.69
162	$477.83	$56.67	$421.15	$8,079.53
163	$477.83	$53.86	$423.96	$7,655.57
164	$477.83	$51.04	$426.79	$7,228.78
165	$477.83	$48.19	$429.63	$6,799.15
166	$477.83	$45.33	$432.50	$6,366.65
167	$477.83	$42.44	$435.38	$5,931.27
168	$477.83	$39.54	$438.28	$5,492.98
169	$477.83	$36.62	$441.21	$5,051.78
170	$477.83	$33.68	$444.15	$4,607.63
171	$477.83	$30.72	$447.11	$4,160.52
172	$477.83	$27.74	$450.09	$3,710.43
173	$477.83	$24.74	$453.09	$3,257.34
174	$477.83	$21.72	$456.11	$2,801.23
175	$477.83	$18.67	$459.15	$2,342.08
176	$477.83	$15.61	$462.21	$1,879.87
177	$477.83	$12.53	$465.29	$1,414.58
178	$477.83	$9.43	$468.40	$946.18
179	$477.83	$6.31	$471.52	$474.66
180	$477.83	$3.16	$474.66	$0.00

Rows 1–12 of 180

Worked example: HELOC Calculator

Interest-only draw. This fixed reference example shows one complete scenario; the interactive results above use your current inputs.

View the example inputs

Outstanding drawn balance: 12000 $
Assumed constant annual rate: 12 %
Interest-only draw period remaining: 2 years
Term: 1 years

Calculated results for the fixed example
Calculated quantity	Example result
Monthly interest-only draw payment	$120.00
Draw-period interest	$2,880.00
Scheduled monthly payment	$1,066.19
Payments until payoff	12 months
Total principal and interest	$12,794.23
Total interest	$794.23

Understanding payments, principal and borrowing cost

Compare the payment and the total cost

An installment payment depends on the amount borrowed, the periodic interest rate and the repayment term. A longer term can make each installment smaller while increasing the number of interest charges. Compare the total paid and the payoff horizon as well as the advertised monthly amount.

Keep the loan’s note interest rate separate from fees and APR unless the calculator specifically asks for APR. Financed fees increase the balance; upfront fees reduce cash received. A zero-interest loan still requires repayment of principal. Check whether the quoted rate is fixed and whether the repayment frequency matches the calculation.

Use a schedule to check what changes

A loan schedule allocates each payment between interest and principal, then reports the remaining balance. Extra principal can reduce later interest without reducing the scheduled installment. A new or recast loan can change the installment itself.

Schedules here retain calculation precision and round displayed cells. Their CSV exports let you inspect the full sequence. If a lender uses different posting dates, daily interest, fees or rounding, its statement can differ from this modeled schedule.

Formula and calculation method

Draw-period interest=balance×annual rate/12. Repayment uses the entered amortizing term.

Assumes no new draws or rate changes. A real HELOC typically has a variable rate and payments can change.

Reference Sources

CFPB: mortgage principal and interest

Frequently asked questions

How does this calculator work?

Draw-period interest=balance×annual rate/12. Repayment uses the entered amortizing term.

What assumptions should I check?

Assumes no new draws or rate changes. A real HELOC typically has a variable rate and payments can change.

Can I save or print this calculation?

Use Copy link with inputs to reproduce the scenario, Download results for a text record, or Print. Where a schedule is shown, its CSV download includes every row.