Maximum Drawdown Calculator
Free maximum drawdown calculator computes drawdown percentage, dollar loss, recovery time, and Ulcer Index from portfolio values. Instant browser results, no signup needed.
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How It Works
The Maximum Drawdown Calculator analyzes a chronological series of portfolio balances to find the worst peak to trough decline and every intermediate drawdown episode. Paste monthly statements, quarterly reports, or daily closes as comma, space, or newline separated numbers. First value is earliest date, last value is most recent. Example: ten thousand, ninety five hundred, ninety two hundred, eighty eight hundred, ninety one hundred, ninety seven hundred, ten thousand two hundred shows a twelve percent max drawdown from ten thousand to eighty eight hundred before recovery. The tool tracks running peak, drawdown percentage at each step, dollar loss at trough, recovery time until balance exceeds prior peak, and Ulcer Index summarizing depth and duration of all underwater periods. Paste a benchmark index series alongside your portfolio to see whether active management reduced or amplified drawdowns relative to passive exposure. Financial advisors export client balance history from custodians to compare drawdown profiles before recommending glide path changes near retirement.
Beyond headline max drawdown, review Ulcer Index, drawdown timeline visualization, and recovery labels including not yet recovered when the series ends below prior peak. Ulcer Index square roots mean squared drawdowns from running peak, penalizing long slow declines more than brief sharp drops of identical max drawdown magnitude. Two funds with identical twelve percent max drawdown can differ sharply on Ulcer Index if one recovered in three months and the other stayed underwater eighteen months. Use results before retirement to stress test whether withdrawal plans survive two thousand eight or twenty twenty two style sequences. Crypto and leveraged ETFs produce extreme drawdowns where Ulcer Index often matters more than single max percentage. Include reinvested dividends in total return balance series for accurate drawdown on buy and hold accounts. New peak markers on the timeline show when the account fully healed before the next decline began, helping you count how many distinct stress episodes occurred inside your sample window.
Stress test withdrawal plans against two thousand eight or twenty twenty two style sequences. Crypto and leveraged ETFs produce extreme drawdowns where Ulcer Index often matters more than single max percentage. Include reinvested dividends in total return balance series for accurate drawdown on buy and hold accounts. New peak markers on the timeline show when the account fully healed before the next decline began, helping you count how many distinct stress episodes occurred inside your sample window.
Use Maximum Drawdown Calculator whenever inputs change: after market moves, new contributions, or revised personal assumptions. Bookmark the page for quick reruns without installing software.
Step by step
- Open Maximum Drawdown Calculator and enter your current inputs.
- Review calculated outputs and summary tables.
- Adjust assumptions and compare scenarios side by side.
Worked example
The Maximum Drawdown Calculator analyzes a chronological series of portfolio balances to find the worst peak to trough decline and every intermediate drawdown episode. Enter the sample inputs described in How it works to reproduce the scenario step by step.
Adjust one input at a time to see sensitivity. Maximum Drawdown Calculator updates instantly so you can stress test optimistic and conservative assumptions before acting.
When to use this calculator
Reach for Maximum Drawdown Calculator when compute max drawdown percentage, dollar loss, recovery time, and ulcer index from portfolio values.. It suits quick what if analysis before trades, allocation changes, or plan updates.
Pair with related tools when the decision spans taxes, liquidity, or multi year projections beyond what one formula captures.
Common mistakes
Copying outputs without checking input units or stale market prices is a frequent error with Maximum Drawdown Calculator. Confirm tickers, percentages, and dates before acting.
Running a single baseline scenario ignores tail risks. Stress test with conservative inputs and compare against related tools listed below when the decision is material.
The Formula
running_peak = first_value
for each value at index i:
if value > running_peak: running_peak = value
drawdown_pct = (running_peak − value) / running_peak
squared_drawdowns[i] = drawdown_pct²
max_drawdown = max(drawdown_pct)
dollar_loss = running_peak_at_start − trough_value
ulcer_index = √(Σ(squared_drawdowns) / n) × 100
Calculations run locally in browser. Use at least twelve periods for stable drawdown estimates. Short samples can understate tail risk. Dollar loss uses peak at start of max episode. Ulcer Index averages squared drawdowns from running peak across all periods including partial recoveries.
Limitations and assumptions
Calculations run locally in browser. Use at least twelve periods for stable drawdown estimates. Short samples can understate tail risk. Dollar loss uses peak at start of max episode. Ulcer Index averages squared drawdowns from running peak across all periods including partial recoveries. Maximum Drawdown Calculator does not replace personalized advice. Fees, slippage, account specific rules, and behavioral constraints may change real world outcomes.
Key terms
- What is maximum drawdown
- Maximum drawdown is the largest peak to trough decline in portfolio value over the observed period.
- What is the Ulcer Index
- Ulcer Index measures depth and duration of drawdowns.
- Model assumption
- Recovery time counts periods from trough until portfolio value returns to or exceeds previous peak.
Compare alternatives
Pair with Sharpe Sortino Ratio for risk adjusted returns, Sequence of Returns Calculator for withdrawal timing risk, Portfolio Temperature for concentration during crashes, and Lost Decade Backtester for long flat windows on portfolios. Use those calculators when maximum drawdown calculator alone does not capture the full decision.
Internal links on portfolios.tools help you chain calculators: run Maximum Drawdown Calculator first, then validate edge cases with a specialized tool from the related section below.
FAQ
What is maximum drawdown?
Maximum drawdown is the largest peak to trough decline in portfolio value over the observed period. It measures worst case loss buying at peak and selling at trough, expressed as peak minus trough divided by peak. Fund managers report max drawdown alongside CAGR to show return quality not just magnitude. Retail investors apply the same stat to personal brokerage exports comparing strategy changes year over year. Max drawdown alone ignores how long pain lasted: a quick V shaped recovery differs emotionally and financially from a multi year flat recovery even at identical max percentage. A twenty percent drawdown that recovers in four months may feel tolerable while the same twenty percent lasting three years drives capitulation sells at the trough.
What is the Ulcer Index?
Ulcer Index measures depth and duration of drawdowns. It equals square root of mean squared percentage drawdowns from running peak, scaled to percentage points. Higher Ulcer Index means deeper or longer underwater periods and more investor pain. Two funds with identical max drawdown can differ sharply on Ulcer Index when recovery speed differs. Income focused investors often prefer lower Ulcer Index even when max drawdown matches a growth peer because sustained underwater periods disrupt withdrawal plans and behavioral discipline. Ulcer Index below five suggests relatively smooth ride while values above ten indicate frequent or prolonged underwater stretches even when headline max drawdown looks moderate.
How is recovery time calculated?
Recovery time counts periods from trough until portfolio value returns to or exceeds previous peak. If series ends before recovery completes, label shows not yet recovered. Long recoveries test discipline and may force retirees to cut withdrawals. Multiple drawdown episodes in one series each contribute to Ulcer Index even after earlier recoveries. Count periods in the same frequency as input data: monthly statements yield months, daily closes yield days. Sequence of returns risk during recovery matters for retirees taking withdrawals: recovering balance on paper still drains principal when distributions continue through the trough.
How should I enter my portfolio values?
Enter portfolio values as numbers separated by commas, spaces, or newlines in chronological order. Each value represents balance at a point in time. Use consistent frequency throughout: mixing weekly and monthly points distorts drawdown timing. Dividends reinvested should be included in total return balance. Deposits and withdrawals distort drawdown unless you use time weighted or unit value series: this tool assumes pure balance series without external flows unless you pre adjust balances. Export from portfolio tracking software that already strips contributions when available rather than raw account balance that jumps on each deposit.
Should I use max drawdown or Ulcer Index?
Max drawdown is single worst case number useful for stress testing tail risk. Ulcer Index gives fuller picture over time: two strategies can share max drawdown but differ on sustained stress. Compare both when choosing between volatile growth and smoother balanced portfolios. Report both metrics when comparing roboadvisor glide paths or target date funds. Short samples under twelve periods may understate tail risk visible only across full market cycles. Extend history back through at least one complete bear market when possible so max drawdown reflects regime change rather than bull market calm only.
How do I use this maximum drawdown calculator on phone or tablet?
Maximum Drawdown Calculator runs entirely in your mobile browser with the same formulas as desktop. Optional localStorage may remember inputs on your device when enabled in browser settings.
Where is my data stored when I use Maximum Drawdown Calculator?
Nowhere on our servers. Calculations execute locally in your browser. Optional localStorage saves form fields on your device only and never transmits portfolio numbers over the network.
Should I rely on Maximum Drawdown Calculator for tax or legal decisions?
No. Maximum Drawdown Calculator provides educational math only. Tax law, account rules, and personal circumstances vary. Consult a qualified tax or legal professional before transactions with material consequences.
Related Tools
Pair with Sharpe Sortino Ratio for risk adjusted returns, Sequence of Returns Calculator for withdrawal timing risk, Portfolio Temperature for concentration during crashes, and Lost Decade Backtester for long flat windows on portfolios.tools. Re run after major portfolio allocation changes to compare drawdown profile before and after rebalancing.