Compound Interest Calculator

Free compound interest calculator with contributions and interactive chart. Calculate your investment growth and future value instantly.

Advanced Compound Interest Calculator

Calculator

Currency Current Savings Amount Number of Years Annual Interest Rate (%) Interest Compounding Additional Contribution Contribution Frequency

Results

Total Contributions: 0

Total Interest: 0

Detailed Breakdown

Period	Balance Before Growth	Contribution This Period	Balance After Contribution	Profit This Period	Balance After Growth	Total Profit	Total Return %

Compound Interest Calculator?

What is a Compound Interest Calculator?

A Compound Interest Calculator is a powerful financial tool that helps you estimate the growth of your investments over time. It allows you to input your initial savings, interest rate, contribution amounts, and compounding frequency to calculate your future wealth.

How Does the Compound Interest Calculator Work?

The calculator takes your input data and simulates how your money grows with compounding. It calculates interest not only on your initial investment but also on accumulated interest from previous periods.

Key Features:

Interactive growth chart
Supports daily, weekly, monthly, quarterly, and yearly contributions
Calculates total contributions, total interest earned, and overall ROI

What is the Compound Interest Formula? Calculation with Example

The compound interest formula is:

Where:

A = Future value of investment
P = Principal / Initial investment
r = Annual interest rate (decimal)
n = Compounding periods per year
t = Time (years)
C = Contribution per period

Example:
If you invest $10,000 at 5% annual interest, compounded monthly, with $200 monthly contributions, after 10 years, the calculator shows your total balance, interest earned, and ROI.

What will $10,000 be worth in 20 years?

Using our calculator, you can see how $10,000 grows over 20 years depending on:

Interest rate
Compounding frequency
Additional contributions

Scenario Example:

Initial investment: $10,000
Annual interest rate: 5%
Monthly contributions: $200
Compounded monthly

Result: Your investment can more than double, showing the power of compounding.

Year	Balance Before Interest	Contribution This Year	Balance After Contribution	Interest This Year	Balance After Interest	Total Profit
1	10,000	2,400	12,400	620	13,020	3,020
2	13,020	2,400	15,420	771	16,191	6,191
3	16,191	2,400	18,591	930	19,521	9,521
4	19,521	2,400	21,921	1,096	23,017	13,017
5	23,017	2,400	25,417	1,271	26,688	16,688
6	26,688	2,400	29,088	1,454	30,542	20,542
7	30,542	2,400	32,942	1,647	34,589	24,589
8	34,589	2,400	36,989	1,849	38,838	28,838
9	38,838	2,400	41,238	2,062	43,300	33,300
10	43,300	2,400	45,700	2,285	47,985	37,985
11	47,985	2,400	50,385	2,519	52,904	42,904
12	52,904	2,400	55,304	2,765	58,069	48,069
13	58,069	2,400	60,469	3,023	63,492	53,492
14	63,492	2,400	65,892	3,292	69,184	59,184
15	69,184	2,400	71,584	3,574	75,158	65,158
16	75,158	2,400	77,558	3,878	81,436	71,436
17	81,436	2,400	83,836	4,192	88,028	78,028
18	88,028	2,400	90,428	4,522	94,950	84,950
19	94,950	2,400	97,350	4,868	102,218	92,218
20	102,218	2,400	104,618	5,231	109,849	99,849

Compounding with Additional Deposits

Adding regular contributions significantly boosts your returns. Even small contributions monthly or yearly can dramatically increase your total wealth over time.

How to Use Weekalla Compound Interest Calculator?

Enter your initial savings amount.
Set the annual interest rate (%).
Choose compounding frequency: yearly, monthly, weekly, or daily.
Optionally, add additional contributions and select their frequency.
Click Calculate to view future value, total contributions, total interest, and ROI.
Analyze the interactive chart and detailed table for insight.