Live tool/tool/compound-interest-calculator

Compound Interest Calculator

Project how an investment grows with recurring monthly contributions. Compare how much of the final balance came from deposits versus compounding.

FinanceSavingsForecasting

Inputs

Initial investment

Monthly contribution

Annual return

Nominal annual rate before converting into a monthly equivalent.

Years invested

Compounds per year

Assumption

This model applies growth monthly and adds contributions at the end of each month. It is useful for planning, but it is still a simplified forecast rather than an investment guarantee.

Future value

$268,952

Estimated total balance at the end of the timeline.

Total invested

$111,000

Principal plus every monthly contribution.

Interest earned

$157,952

Growth created by compounding, not direct deposits.

Balance composition

Deposits vs. compounding

0.58% monthly equivalent

Contributions $111,000

Interest $157,952

Yearly breakdown

Watch the curve build.

20 yearly snapshots

Year 1

Balance$21,041.39

Deposits$19,800.00

Interest$1,241.39

Year 2

Balance$27,519.50

Deposits$24,600.00

Interest$2,919.50

Year 3

Balance$34,465.92

Deposits$29,400.00

Interest$5,065.92

Year 4

Balance$41,914.50

Deposits$34,200.00

Interest$7,714.50

Year 5

Balance$49,901.54

Deposits$39,000.00

Interest$10,901.54

Year 6

Balance$58,465.96

Deposits$43,800.00

Interest$14,665.96

Year 7

Balance$67,649.50

Deposits$48,600.00

Interest$19,049.50

Year 8

Balance$77,496.93

Deposits$53,400.00

Interest$24,096.93

Year 9

Balance$88,056.22

Deposits$58,200.00

Interest$29,856.22

Year 10

Balance$99,378.84

Deposits$63,000.00

Interest$36,378.84

Year 11

Balance$111,519.98

Deposits$67,800.00

Interest$43,719.98

Year 12

Balance$124,538.81

Deposits$72,600.00

Interest$51,938.81

Year 13

Balance$138,498.76

Deposits$77,400.00

Interest$61,098.76

Year 14

Balance$153,467.88

Deposits$82,200.00

Interest$71,267.88

Year 15

Balance$169,519.12

Deposits$87,000.00

Interest$82,519.12

Year 16

Balance$186,730.70

Deposits$91,800.00

Interest$94,930.70

Year 17

Balance$205,186.52

Deposits$96,600.00

Interest$108,586.52

Year 18

Balance$224,976.50

Deposits$101,400.00

Interest$123,576.50

Year 19

Balance$246,197.10

Deposits$106,200.00

Interest$139,997.10

Year 20

Balance$268,951.75

Deposits$111,000.00

Interest$157,951.75

Year	Balance	Deposits	Interest
Year 1	$21,041.39	$19,800.00	$1,241.39
Year 2	$27,519.50	$24,600.00	$2,919.50
Year 3	$34,465.92	$29,400.00	$5,065.92
Year 4	$41,914.50	$34,200.00	$7,714.50
Year 5	$49,901.54	$39,000.00	$10,901.54
Year 6	$58,465.96	$43,800.00	$14,665.96
Year 7	$67,649.50	$48,600.00	$19,049.50
Year 8	$77,496.93	$53,400.00	$24,096.93
Year 9	$88,056.22	$58,200.00	$29,856.22
Year 10	$99,378.84	$63,000.00	$36,378.84
Year 11	$111,519.98	$67,800.00	$43,719.98
Year 12	$124,538.81	$72,600.00	$51,938.81
Year 13	$138,498.76	$77,400.00	$61,098.76
Year 14	$153,467.88	$82,200.00	$71,267.88
Year 15	$169,519.12	$87,000.00	$82,519.12
Year 16	$186,730.70	$91,800.00	$94,930.70
Year 17	$205,186.52	$96,600.00	$108,586.52
Year 18	$224,976.50	$101,400.00	$123,576.50
Year 19	$246,197.10	$106,200.00	$139,997.10
Year 20	$268,951.75	$111,000.00	$157,951.75