The compounding returns calculator projects how your average monthly trading return grows an account over time using the formula A = P × (1 + r)^n. What surprises most traders is the non-linearity: a 2% average monthly gain compounds to 26.8% annually, while 3% monthly reaches 42.6% annually — not a 50% increase in outcome, but a 59% increase. The calculator above delivers instant 1-, 3-, and 5-year projections from your actual journal data.
How to Use
| Input | What to Enter | Example |
|---|---|---|
| Starting Account Size | Your current account balance | $25,000 |
| Average Monthly Return | Your mean monthly R% from your journal | 1.6% |
| Time Period (Months) | Projection horizon (12, 36, or 60 recommended) | 36 |
| Expected Max Drawdown | Historical peak-to-trough loss (optional) | 12% |
Enter your average monthly return from at least 3–6 months of tracked data. The output shows projected account value and total return percentage. The drawdown input, when provided, models how a single significant losing period compresses the projection.
Formula Explained
A = P × (1 + r)^n
A = Final account value
P = Starting account balance (principal)
r = Average monthly return rate (as decimal: 2% = 0.02)
n = Number of months
The exponent is where compounding creates its leverage. At r = 0.02, each month you earn 2% on a base that already includes all prior months’ gains. After 12 months, (1.02)^12 = 1.2682, meaning a 26.82% annual return from 2% monthly — significantly more than 12 × 2% = 24% simple interest.
The relationship between r and final outcome is exponential, not linear. Moving from 2% to 3% monthly — a single percentage point — increases the 3-year multiplier from 2.04× to 2.90×. That extra point of monthly edge is worth building an entire journaling and review practice around.
Drawdown interrupts this process in two ways. First, the base P shrinks, so subsequent months compound a smaller number. Second, a 20% drawdown requires a 25% recovery just to reach the prior high — the drawdown recovery calculator quantifies exactly how many months of gains a single losing streak costs.
Example Calculations
Scenario 1: Developing Trader Using Journal Data
A trader tracks six months in their journal: Jan +3.1%, Feb +1.8%, Mar -1.2%, Apr +2.4%, May +2.9%, Jun +0.6% — averaging 1.6% monthly.
- Account: $25,000
- Monthly return: 1.6%
- 12 months: $25,000 × (1.016)^12 = $30,250
- 36 months: $25,000 × (1.016)^36 = $44,300 (77% total return)
- 60 months: $25,000 × (1.016)^60 = $64,800 (159% total return)
This projection gives the trader a concrete target: if they can improve their edge from 1.6% to 2.8% monthly through disciplined journaling, the 5-year outcome becomes $131,000 — a $66,200 difference from 1.2 extra percentage points of monthly edge.
Scenario 2: Consistent Performer at 3% Monthly
- Account: $25,000
- Monthly return: 3% (42.6% annualized)
- 12 months: $25,000 × (1.03)^12 = $35,644
- 36 months: $25,000 × (1.03)^36 = $72,457 (190% total return)
At this return level, the account nearly triples in three years. Prop firm industry standards — typically requiring under 5% daily drawdown and under 10% maximum drawdown — are designed specifically to protect this kind of compounding trajectory. A single 15% drawdown at month 6 extends the 36-month timeline by roughly 4–5 months of recapture before compounding resumes at full speed.
When to Use This Calculator
- Setting realistic annual targets: Convert your historical average monthly return to an annual expectation before setting P&L goals for the year
- Evaluating strategy improvements: Quantify the long-term dollar value of improving your monthly win rate or average R-multiple by even 0.5%
- Assessing drawdown cost: Enter your max drawdown to see how much compounding runway a losing streak eliminates, not just the nominal dollar loss
- Comparing account growth paths: Run two scenarios — your current edge vs. your best-3-month edge — to make the improvement target tangible
- Position sizing review: Traders who risk a fixed percentage of equity (rather than a fixed dollar amount) are mechanically implementing compounding — this calculator shows why that distinction matters over years
Related Tools
- Drawdown Recovery Calculator — Calculates exactly how many months of gains a drawdown consumes, and the recovery percentage required to return to the prior equity high
- Risk of Ruin Calculator — Models the probability that a sequence of losses wipes out a defined percentage of the account before compounding can recover it
- Sharpe Ratio Calculator — Measures return per unit of risk, the complementary metric to raw compounding growth for evaluating whether a monthly return is sustainable
Frequently Asked Questions
How do you calculate compounding returns for a trading account?
Use A = P × (1 + r)^n, where P is your starting account balance, r is your average monthly return expressed as a decimal, and n is the number of months in the projection. A $25,000 account earning 2% monthly for 12 months compounds to $25,000 × (1.02)^12 = $31,706 — not $30,000 as simple interest would suggest.
What is a realistic monthly return for a retail trader?
A consistent 1.5%–3% monthly return is considered strong for retail traders, equivalent to 19.6%–42.6% annually. Barber and Odean’s research found the average retail trader underperforms by 3.7% annually — which, compounded over 10 years, represents the majority of potential account growth. Tracking monthly returns in a trading return calculator and journal is the baseline for improving this figure.
How does a drawdown affect compound growth?
A 20% drawdown requires exactly 25% recovery just to reach the prior equity high. During the recovery period, compounding is working against the account rather than for it: the base is smaller, so each profitable month adds less in absolute terms than it would have at the prior high. Sequence of returns risk amplifies this — a major drawdown in the first year of an account is more damaging than the same drawdown in year four, because it eliminates the most compounding runway.
Why does monthly consistency matter more than occasional large gains?
Compounding rewards a growing base every period. A trader who earns 2% consistently each month compounds 36 times over three years, ending at 2.04× their starting capital. A trader who earns large gains in some months and sits flat in others misses compounding in the flat months — the growing base from prior wins earns nothing. Over multi-year periods, regularity of positive returns is more valuable than the magnitude of peak months.
What is sequence of returns risk for traders?
Sequence of returns risk describes the mathematical fact that the timing of losses relative to the start of an account matters enormously. A 25% drawdown in month 3 of a $25,000 account leaves $18,750 as the new compounding base for the remaining years. The same drawdown in month 30, when the account has grown to $50,000, still costs $12,500 in nominal terms — but the account has had 27 additional months of compounding that can absorb the hit. Early drawdowns steal compounding runway that is mathematically unrecoverable.
