What Is a Compounding Calculator?
A compounding calculator helps traders and investors estimate how their capital can grow over time when profits are continuously reinvested rather than withdrawn.
This tool is built specifically for forex traders, crypto traders, stock investors, and anyone running a compounding strategy who also wants to understand the risk behind the returns. If you also want to check individual trade sizing before running a full projection, try the Risk Reward Calculator.
Compounding for Forex Traders
Forex traders typically compound gains on a daily or weekly basis using a fixed percentage risk model. Because leverage is common in forex, even small daily edges can compound quickly — but the same leverage magnifies drawdowns, so pair this projection with the Ruin Probability figure below rather than looking at Final Capital alone.
Compounding for Crypto Traders
Crypto markets tend to have higher volatility than forex or equities, which usually means a wider spread between best-case and worst-case outcomes for the same win rate and reward-to-risk inputs. Traders often model crypto compounding with a lower reinvestment percentage to lock in partial profits along the way.
Compounding for Stock Investors
Stock investors usually compound on a monthly or quarterly basis rather than daily, reflecting realistic holding periods. Lower assumed returns per period (often under 2%) tend to produce more realistic long-horizon projections for equities.
How Compounding Works in Trading
Compounding means earning returns on both your original capital and your previous profits. As your balance grows, each future gain becomes larger in absolute terms, even if the percentage return per period stays the same.
Daily vs Weekly vs Monthly Compounding
The compounding frequency you choose changes how quickly small edges accumulate. Here's a quick comparison:
| Frequency | Typical Use Case | Return Assumption | Growth Sensitivity |
|---|---|---|---|
| Daily | Active forex/crypto day trading | 0.3% – 1.5% per day | Very high — small rate changes compound fast |
| Weekly | Swing trading, part-time trading | 1% – 5% per week | Moderate |
| Monthly | Long-term investing, portfolio management | 2% – 8% per month | Lower — smoother, more realistic long-term curve |
Features of This Compounding Calculator
- Calculate daily, weekly, or monthly compound growth
- Estimate long-term trading account growth
- Analyze win rate and risk management together
- Visualize growth on an interactive chart
- Measure drawdown and ruin probability
- Plan position sizing with Kelly criterion output
Realistic Trading Growth Scenarios
Example compounding outcomes based on different daily return assumptions, starting from $10,000 over 60 periods:
- Conservative: $10,000 → ~$13,489 (0.5% daily)
- Moderate: $10,000 → ~$18,166 (1% daily)
- Aggressive: $10,000 → ~$33,102 (2% daily)
How This Calculator Works
The growth projection uses a standard compound interest model to simulate capital growth over time using reinvested returns.
Formula: Capitalₙ = Capital₀ × (1 + r)ⁿ
Where r is the return per period and n is the number of periods.
Trading Risk Model
Alongside pure compounding, the calculator integrates trading metrics — win rate, reward-to-risk ratio, and risk per trade — to estimate expectancy, drawdown, and account growth variability. Use the Settings panel's Win Rate and Risk Per Trade sliders together with the Risk Reward Calculator to sanity-check your position sizing before applying it here.
- Win rate probability modeling
- Risk-to-reward expectancy calculations
- Drawdown estimation
- Ruin probability approximation
Assumptions & Disclaimer
This calculator uses simplified mathematical assumptions and does not account for real-world trading factors such as slippage, fees, liquidity constraints, or emotional decision-making. Ruin probability and Kelly criterion figures are simplified approximations for educational reference only, not trading recommendations.
Risk Warning
Trading forex, crypto, and stocks involves significant risk. You may lose some or all of your invested capital. This tool is for educational and simulation purposes only and is not financial advice.
Frequently Asked Questions
Is this compounding calculator free?
Yes, the calculator is completely free and works directly in your browser with no signup required.
Can I use this calculator for forex trading?
Yes, it works for forex, crypto, stocks, and other investment growth projections.
What is the Kelly Criterion shown in the results?
It estimates the theoretical position size that maximizes long-term account growth based on your win rate and reward-to-risk ratio. Treat it as a reference figure, not a trading instruction.
How is compounding different from simple interest in trading?
Simple interest is calculated only on the original capital, while compounding is calculated on the original capital plus all previously reinvested profits, so growth accelerates over time.
Is compounding realistic in forex or crypto trading?
Sustaining high daily returns consistently is very difficult in real markets due to slippage, fees, and variable win rates. Treat these projections as a theoretical ceiling, not a guarantee.
What is a safe daily or weekly return percentage to assume?
Many experienced traders model growth using modest returns of roughly 0.5% to 1% per period, since higher assumed returns usually carry disproportionately higher drawdown or ruin risk.
How does the Kelly Criterion affect drawdown risk?
Position sizes larger than the Kelly-suggested fraction can increase both potential growth and the depth of drawdowns, which is why many traders use a fraction of full Kelly to manage risk.