Compound Interest Calculator
Visualize how compounding returns grow your trading account over weeks, months, and years.
Free — no signup, no ads, instant results
Inputs
Results
Final Balance
$1,795.86
Total Profit
$795.86
Growth Multiplier
1.80x
Month-by-Month Breakdown
| Month | Start | Added | Profit | End Balance |
|---|---|---|---|---|
| 1 | $1,000.00 | $0.00 | +$50.00 | $1,050.00 |
| 2 | $1,050.00 | $0.00 | +$52.50 | $1,102.50 |
| 3 | $1,102.50 | $0.00 | +$55.13 | $1,157.63 |
| 4 | $1,157.63 | $0.00 | +$57.88 | $1,215.51 |
| 5 | $1,215.51 | $0.00 | +$60.78 | $1,276.28 |
| 6 | $1,276.28 | $0.00 | +$63.81 | $1,340.10 |
| 7 | $1,340.10 | $0.00 | +$67.00 | $1,407.10 |
| 8 | $1,407.10 | $0.00 | +$70.36 | $1,477.46 |
| 9 | $1,477.46 | $0.00 | +$73.87 | $1,551.33 |
| 10 | $1,551.33 | $0.00 | +$77.57 | $1,628.89 |
| 11 | $1,628.89 | $0.00 | +$81.44 | $1,710.34 |
| 12 | $1,710.34 | $0.00 | +$85.52 | $1,795.86 |
Who Is This For?
Traders and investors who want to see how their capital grows over time with consistent returns and optional monthly contributions. Useful for setting realistic growth targets and understanding compounding.
The Power of Compounding in Trading
Compound interest is the most powerful force in growing a trading account. By reinvesting profits, each month's gains are calculated on a larger balance — creating exponential growth over time.
Even modest monthly returns of 3-5% compound dramatically. A $1,000 account growing at 5% monthly reaches over $1,795 in just 12 months — nearly doubling without any additional deposits.
The key to compounding is consistency. GrandAlgo indicators help you find high-probability setups to maintain steady returns month after month. Learn how to build a consistent trading system that enables compounding.
The Compound Growth Formula
The compound growth formula is: Future Value = Principal × (1 + Monthly Return)^Months
For example, $5,000 compounding at 5% monthly for 12 months: $5,000 × 1.05^12 = $8,979. That's a 79.6% annual return from "only" 5% per month.
The catch is consistency. A single -20% month wipes out roughly four +5% months due to the asymmetric nature of percentage losses. This is why protecting your capital during drawdowns is more important than chasing high monthly returns.
How to Use This Calculator
1. Enter starting balance
Input your current account balance or the amount you plan to start trading with.
2. Enter expected monthly return
Be realistic with this number. Consistently achieving 3-5% monthly is ambitious but achievable for disciplined traders with a proven strategy.
3. Enter time period in months
Set the number of months you want to project forward. Longer time horizons show the dramatic effect of compounding more clearly.
4. Read the projected balance and month-by-month breakdown
The calculator shows your projected final balance, total gain, and a detailed month-by-month table so you can track the compounding curve.
Worked Example
Step 1: Starting balance $5,000, monthly return 5%, monthly contribution $500.
Step 2: Time period 12 months. Total contributions = $11,000 ($5,000 + 12 × $500).
Step 3: Compounding at 5%/month on a growing balance with contributions.
Result: After 12 months: balance grows to approximately $18,275. Growth from compounding: $7,275.
Assumptions & Edge Cases
- Assumes a fixed monthly return — real returns vary.
- Does not account for drawdowns, losing months, or taxes.
- Monthly contributions are added at the start of each period.
- Compounding is monthly, not daily.
Frequently Asked Questions
Compound interest in trading means reinvesting your profits so that future returns are calculated on a growing balance rather than the original capital. If you make 5% on $10,000 in month one ($500 profit), month two’s 5% is calculated on $10,500 — earning $525. Over time, this snowball effect dramatically accelerates account growth.
Consistently achieving 3-5% monthly returns is considered very good among professional traders. Strategies claiming 10-20% monthly returns are either extremely high-risk, not accounting for drawdowns, or not sustainable long-term. Use this calculator with conservative estimates to set realistic expectations.
Drawdowns are devastating to compounding because losses require proportionally larger gains to recover. A 20% drawdown requires a 25% gain to break even. A 50% drawdown requires 100%. This asymmetry is why risk management and consistent position sizing matter more than maximizing monthly returns.