Your Drawdown Warning Should Fire About 1 Time in 20. That Is the Point.
A drawdown warning that never fires is set too loose. One that fires every week is set too tight. If you size and limit an EA from the same number, you can say in advance how often it should fire.
The idea: anchor the warning to a percentile of the EA's own drawdown, and a warning becomes a measured event rather than a scare.
Step 1. Calibrate. Resample the EA's closed trades and take the 95th-percentile drawdown (p95): the drawdown that only 1 in 20 resampled histories exceeds. Say it comes out at $1,400.
Step 2. Size from it. Set operating capital so that p95 equals a 20% drawdown: $1,400 / 0.20 = $7,000.
Step 3. Put the bands on the same base:
| Band | % of $7,000 | Drawdown | What it means |
|---|---|---|---|
| Warn | 20% | $1,400 | at p95: about 1 resampled history in 20 gets here |
| Delete pendings | 26% | $1,820 | beyond anything in 95% of resamples |
| Close (if enabled) | 32% | $2,240 | well outside the EA's own history |
The non-obvious part: with this setup, a warning is the bad tail you planned for, not a malfunction. The real signal is frequency. If an EA hits its warning far more often than about 1 in 20 stretches of the same length, it is trading worse live than its history says. That tells you more than any single drawdown does.
The mistake we see: sizing from one number (a backtest max, a round $5,000) and setting limits from another. On $5,000 the same 20% warning sits at $1,000, below p95, so it fires more often than 1 in 20, by an amount nobody has measured.
VRD Monitor Account Drawdown and Risk Monitor puts both steps in one panel: Quant's per-EA calibration (2,000 bootstrap resamples, p95 drawdown, suggested capital) and Guardian's 20/26/32% bands on that same capital. It works per EA with no account-wide stop, and live drawdown can still exceed the estimate.
What to do today: for one EA, check whether its drawdown limit and its capital come from the same number. If they don't, the alert frequency is a guess.
Try it: Try the free demo of VRD Monitor in the Strategy Tester to see three made-up EAs on its sample desk, each with its own operating capital and bands. $149 to buy, or rent for $35 for 1 month.
https://www.mql5.com/en/market/product/204800
Virtual Risk Desk
Figures are illustrative. Resampled estimates describe the EA's past trades and can be exceeded live. Educational content, not trading advice.
