# Compound Growth Calculator

URL: https://speedycalculator.com/calculators/finance/compound-growth/
Last updated: 2026-10-25

> The compound growth calculator projects how an initial amount and regular additions grow at a compound rate – with any compounding frequency, deposits at the start or end of each period, and additions that grow every year.

## Inputs

- Initial amount
- Annual growth rate (%)
- Term (years, months)
- Compounding frequency
- Additional deposit
- Deposit frequency
- Deposit timing
- Yearly increase of deposits (%)

## Results

- Final balance
- Total deposits
- Total compound growth
- Share of balance from growth

## Formula

```
FV = P × (1 + r ÷ m)^(m × t) + C × [(1 + i)^n − (1 + g)^n] ÷ (i − g) × (1 + i × timing)
i = rate per deposit period, n = number of deposits, g = growth of each deposit
```

## Explanation

Compound growth means each period's growth earns growth itself. Over long periods it dominates: $10,000 at 7% grows to almost $77,000 in 30 years without any additions. Raising contributions with your income each year speeds things up further.

### How to use the Compound Growth Calculator

- **Initial amount**
- **Annual growth rate**
- **Term**
- **Compounding frequency**
- **Additional deposit**
- **Deposit frequency**
- **Deposit timing**
- **Yearly increase of deposits**

Results update as you type, and every field accepts the units shown in its menu.

### How it works

Enter the initial amount, growth rate, term and compounding, then any regular additions with their frequency, timing and yearly increase.

### Tips

- Use the nominal annual rate and pick the compounding frequency your bank or broker states.
- Small differences in return or fees compound into large differences over decades.
- Run the calculation with a cautious, a central and an optimistic return to see the range of outcomes.
- Past returns do not guarantee future returns – nothing here is investment advice.

### Common mistakes to avoid

- Comparing an APR with an APY or effective rate.
- Ignoring inflation, taxes and fees when judging a real return.
- Entering a percentage as a decimal (5 instead of 0.05 is correct here).

### Inputs explained

FieldWhat to enterInitial amountAmount in your currencyAnnual growth rateIn %TermUnits: years, monthsCompounding frequencyChoose one: Yearly, Semi-annually, Quarterly, Monthly …Additional depositAmount in your currencyDeposit frequencyChoose one: Monthly, Bi-weekly, Weekly, Quarterly …Deposit timingChoose one: End of each period, Beginning of each periodYearly increase of depositsIn %

### What each result means

- **Total compound growth** = [Final balance] - [Initial amount] - [Total deposits]
- **Share of balance from growth** = [Total compound growth]÷[Final balance]×100

### Example values

How the main result changes when **Initial amount** changes and everything else stays at the example values above:

Initial amountFinal balance5,000124,379.037,500134,475.8710,000144,572.7212,500154,669.5715,000164,766.4120,000184,960.11

## Worked example

Inputs — Initial amount: $10,000; Annual growth rate: 7 %; Term: 20 years; Compounding frequency: Monthly; Additional deposit: $200; Deposit frequency: Monthly; Deposit timing: End of each period; Yearly increase of deposits: 0 %.

Results — **Final balance = $144,572.72**; Total deposits = $48,000.00; Total compound growth = $86,572.72; Share of balance from growth = 59.88 %.

## FAQ

**What is compound growth?**
Growth on both the original amount and the growth already earned.

**How long does it take to double money?**
About 72 ÷ rate years – roughly 10 years at 7%.

**Does deposit timing matter?**
Deposits at the start of each period earn one more period of growth.

**What formula does the Compound Growth Calculator use?**
FV = P × (1 + r ÷ m)^(m × t) + C × [(1 + i)^n − (1 + g)^n] ÷ (i − g) × (1 + i × timing).


## Sources

- [U.S. SEC – Investor.gov compound interest and investing basics](https://www.investor.gov/)