Interest Calculator

Compute interest on loans or savings accurately using our free online tool.

Interest Calculator

Starting Principal

Annual Addition

Monthly Addition

Contribute

Interest Rate

Investment length

years

Tax Rate

Inflation Rate

There was an error with your calculation.

Interest

End Balance: $135,479.01

After Inflation Adjustment: $100,809.11

Total Principal: $99,000.00

Total Interest: $39,224.74

Total Interest after Tax: $36,479.01

Initial investment

Interest after tax

Contributions

Tax

0 yr

5 yr

10 yr

#	DEPOSIT	INTEREST	ENDING BALANCE
1	$32,400.00	$1,486.44	$33,886.44
2	$7,400.00	$1,908.58	$43,195.01
3	$7,400.00	$2,350.77	$52,945.78
4	$7,400.00	$2,813.97	$63,159.75
5	$7,400.00	$3,299.17	$73,858.93
6	$7,400.00	$3,807.43	$85,066.35
7	$7,400.00	$4,339.82	$96,806.18
8	$7,400.00	$4,897.51	$109,103.69
9	$7,400.00	$5,481.69	$121,985.38
10	$7,400.00	$6,093.62	$135,479.01

#	DEPOSIT	INTEREST	ENDING BALANCE
1	$30,200.00	$117.03	$30,317.03
2	$200.00	$118.25	$30,635.28
3	$200.00	$119.49	$30,954.77
4	$200.00	$120.72	$31,275.49
5	$200.00	$121.97	$31,597.46
6	$200.00	$123.22	$31,920.67
7	$200.00	$124.47	$32,245.14
8	$200.00	$125.72	$32,570.87
9	$200.00	$126.99	$32,897.85
10	$200.00	$128.25	$33,226.11
11	$200.00	$129.53	$33,555.63
12	$200.00	$130.80	$33,886.44
Year 1 End
13	$5,200.00	$151.46	$39,237.90
14	$200.00	$152.82	$39,590.72
15	$200.00	$154.19	$39,944.91
16	$200.00	$155.56	$40,300.47
17	$200.00	$156.94	$40,657.41
18	$200.00	$158.32	$41,015.73
19	$200.00	$159.71	$41,375.44
20	$200.00	$161.10	$41,736.55
21	$200.00	$162.50	$42,099.05
22	$200.00	$163.91	$42,462.96
23	$200.00	$165.32	$42,828.28
24	$200.00	$166.73	$43,195.01
Year 2 End
25	$5,200.00	$187.53	$48,582.54
26	$200.00	$189.03	$48,971.57
27	$200.00	$190.54	$49,362.11
28	$200.00	$192.05	$49,754.17
29	$200.00	$193.57	$50,147.74
30	$200.00	$195.10	$50,542.84
31	$200.00	$196.63	$50,939.47
32	$200.00	$198.17	$51,337.63
33	$200.00	$199.71	$51,737.34
34	$200.00	$201.26	$52,138.60
35	$200.00	$202.81	$52,541.41
36	$200.00	$204.37	$52,945.78
Year 3 End
37	$5,200.00	$225.31	$58,371.10
38	$200.00	$226.96	$58,798.06
39	$200.00	$228.62	$59,226.68
40	$200.00	$230.28	$59,656.96
41	$200.00	$231.95	$60,088.90
42	$200.00	$233.62	$60,522.52
43	$200.00	$235.30	$60,957.82
44	$200.00	$236.99	$61,394.81
45	$200.00	$238.68	$61,833.49
46	$200.00	$240.38	$62,273.87
47	$200.00	$242.09	$62,715.95
48	$200.00	$243.80	$63,159.75
Year 4 End
49	$5,200.00	$264.89	$68,624.65
50	$200.00	$266.70	$69,091.34
51	$200.00	$268.50	$69,559.85
52	$200.00	$270.32	$70,030.17
53	$200.00	$272.14	$70,502.31
54	$200.00	$273.97	$70,976.28
55	$200.00	$275.81	$71,452.09
56	$200.00	$277.65	$71,929.74
57	$200.00	$279.50	$72,409.24
58	$200.00	$281.36	$72,890.60
59	$200.00	$283.23	$73,373.83
60	$200.00	$285.10	$73,858.93
Year 5 End
61	$5,200.00	$306.35	$79,365.28
62	$200.00	$308.32	$79,873.60
63	$200.00	$310.29	$80,383.88
64	$200.00	$312.26	$80,896.14
65	$200.00	$314.25	$81,410.39
66	$200.00	$316.24	$81,926.63
67	$200.00	$318.24	$82,444.87
68	$200.00	$320.25	$82,965.12
69	$200.00	$322.26	$83,487.39
70	$200.00	$324.29	$84,011.67
71	$200.00	$326.32	$84,537.99
72	$200.00	$328.36	$85,066.35
Year 6 End
73	$5,200.00	$349.78	$90,616.14
74	$200.00	$351.91	$91,168.05
75	$200.00	$354.05	$91,722.10
76	$200.00	$356.20	$92,278.30
77	$200.00	$358.35	$92,836.65
78	$200.00	$360.52	$93,397.17
79	$200.00	$362.69	$93,959.86
80	$200.00	$364.87	$94,524.73
81	$200.00	$367.06	$95,091.79
82	$200.00	$369.26	$95,661.04
83	$200.00	$371.46	$96,232.50
84	$200.00	$373.68	$96,806.18
Year 7 End
85	$5,200.00	$395.27	$102,401.45
86	$200.00	$397.58	$102,999.03
87	$200.00	$399.90	$103,598.93
88	$200.00	$402.22	$104,201.15
89	$200.00	$404.55	$104,805.71
90	$200.00	$406.90	$105,412.60
91	$200.00	$409.25	$106,021.85
92	$200.00	$411.61	$106,633.46
93	$200.00	$413.98	$107,247.44
94	$200.00	$416.36	$107,863.80
95	$200.00	$418.75	$108,482.55
96	$200.00	$421.14	$109,103.69
Year 8 End
97	$5,200.00	$442.93	$114,746.62
98	$200.00	$445.42	$115,392.04
99	$200.00	$447.92	$116,039.96
100	$200.00	$450.43	$116,690.39
101	$200.00	$452.95	$117,343.34
102	$200.00	$455.48	$117,998.82
103	$200.00	$458.02	$118,656.84
104	$200.00	$460.57	$119,317.41
105	$200.00	$463.13	$119,980.54
106	$200.00	$465.70	$120,646.24
107	$200.00	$468.28	$121,314.52
108	$200.00	$470.87	$121,985.38
Year 9 End
109	$5,200.00	$492.84	$127,678.23
110	$200.00	$495.53	$128,373.76
111	$200.00	$498.22	$129,071.98
112	$200.00	$500.93	$129,772.91
113	$200.00	$503.65	$130,476.55
114	$200.00	$506.37	$131,182.92
115	$200.00	$509.11	$131,892.03
116	$200.00	$511.86	$132,603.89
117	$200.00	$514.62	$133,318.50
118	$200.00	$517.38	$134,035.89
119	$200.00	$520.16	$134,756.05
120	$200.00	$522.95	$135,479.01
Year 10 End

What is an Online Interest Calculator?

An Online Interest Calculator is a tool that helps you calculate the interest earned or paid on a principal amount over a certain period, based on an interest rate. It can be used for various types of interest calculations, such as simple interest or compound interest, and is widely used by individuals, businesses, and investors. This tool provides an easy way to determine the amount of interest accrued on savings, loans, or investments.

How to Use an Online Interest Calculator?

Enter the Principal Amount:
- Input the amount of money you are investing or borrowing (the principal).
Choose the Interest Type:
- Select whether you want to calculate simple interest or compound interest. Simple interest is calculated only on the principal amount, while compound interest is calculated on the initial principal and the accumulated interest.
Enter the Interest Rate:
- Enter the interest rate, typically as an annual percentage rate (APR).
Set the Time Period:
- Input the duration for which the interest will be calculated (in years, months, or days, depending on the calculator).
Calculate the Interest:
- After entering all the information, click on the “Calculate” button to get the interest amount.
View the Results:
- The calculator will show the interest amount, and in the case of compound interest, it will also show the total amount after the interest is added.

Frequently Asked Questions-

What is the difference between simple interest and compound interest?
- Simple interest is calculated only on the initial principal, while compound interest is calculated on both the principal and any accumulated interest. Compound interest grows exponentially over time because it includes interest on the interest.
How is compound interest calculated?
- Compound interest is calculated using the formula:
  $A = P \left(1 + \frac{r}{n}\right)^{nt}$ $A = P (1 + \frac{r}{n})^{n t}$
  Where:
  - $A$ is the total amount (principal + interest)
  - $P$ is the principal
  - $r$ is the interest rate (decimal form)
  - $n$ is the number of times the interest is compounded per year
  - $t$ is the time the money is invested or borrowed for, in years
What does the interest rate represent in an Online Interest Calculator?
- The interest rate represents the percentage of the principal amount that will be charged as interest over a specific period, typically expressed as an annual percentage rate (APR). In compound interest calculations, this rate will apply to both the principal and any interest earned.
Can I use the Online Interest Calculator for different time periods?
- Yes, most interest calculators allow you to specify the duration in different units, such as years, months, or even days. The calculator adjusts the interest calculations based on the selected time frame.
How do I calculate interest if my investment or loan compounds more than once per year?
- If your investment or loan compounds more than once a year, you need to divide the annual interest rate by the number of compounding periods per year (e.g., monthly, quarterly). The Online Interest Calculator will usually handle this automatically when you enter the number of compounding periods (such as monthly, quarterly, etc.).