Maximum lot size in a signal copier: how to set it
A maximum lot size is the ceiling on any one copied trade, whatever your sizing rule works out. Here is why a tight stop loss makes it necessary and how to pick the number.
A maximum lot size is a ceiling on the volume of any one copied trade: whatever your sizing rule works out, the copier never places more than the ceiling. It is the guard that stops a sizing mistake, a tiny stop loss or a room that suddenly posts a huge lot from turning into an order you did not intend. CopySignals is a cloud Telegram signal copier for MT4, MT5 and eTrader: it reads the rooms you already follow through your own Telegram account and places the trades on your own broker account, and every sizing mode in it is capped by a maximum lot. The Telegram to MT5 page shows where it sits in the setup.
What is a maximum lot size in a signal copier?
It is a hard limit on the volume of a single order. The sizing rule decides what a trade should be. The maximum lot decides what it is allowed to be. If the rule says 3.2 lots and the ceiling is 1.0, the order goes out at 1.0.
It does not change the stop loss or the targets, and it does not skip the signal. The trade is placed, just smaller than the rule wanted. What the event log shows for a trade that was held to the ceiling is something to read on your own demo account, because this article does not describe that wording.
Why do you need a ceiling if you already have a sizing rule?
Because every sizing rule has an input you do not control. There are four ways to size in CopySignals: a fixed lot, a percent of the account measured against the signal's own stop, a multiple of the master's lot, or the master's lot scaled by balance. Three of the four take something from outside your account.
- Percent of the account divides your risk by the distance to the stop. A room that posts a stop very close to the entry gives a very large lot, because a small stop means each lot risks little.
- A multiple of the master's lot repeats whatever the master did, times your number. If the master doubles up once, so do you.
- Balance scaling follows the master's lot too, so a master who changes size changes yours.
A fixed lot is the only mode where the volume is yours alone, and even there a typing slip, 1.0 for 0.1, is the kind of error a ceiling catches. We cover the choice between modes in fixed lot or risk percent, and the arithmetic of the percent mode in sizing by risk percent.
How does a tight stop loss produce a huge lot?
Percent sizing works backwards from the stop. You risk, say, one percent of the account. The copier takes the distance between entry and stop, converts it into money per lot, and divides. A stop 40 pips away gives a modest lot. A stop 4 pips away gives about ten times the lot for the same one percent.
That is correct arithmetic and still a risk. A 4 pip stop on a volatile pair can be hit by ordinary noise, or by a wide spread at the moment of entry, and the position you hold is the large one. The maximum lot is what you set so that no stop, however tight, can ask for more volume than you are willing to hold. Trading carries risk, and the ceiling reduces one kind of it, not all of it.
What happens when the room sends no stop or a wrong one?
A post that does not read as a trade is skipped, and the reason goes on the event log. That covers the clear cases. The harder ones are a stop that reads as valid but is a typo, one digit short of what the poster meant. Percent sizing will faithfully size that trade against the wrong stop. A ceiling is the second line behind the parser here, because it bounds the damage of a stop that parsed correctly and was still wrong. We go through the missing-stop case in what to do when a signal has no stop loss.
How do you choose the number?
Start from the biggest single trade you would be comfortable losing on its stop, then convert it to lots for the instruments you copy. Do it per instrument, because a lot is worth very different amounts on a forex pair, on gold and on an index.
- Write down the largest loss you accept on one trade, in your account currency.
- For each instrument you copy, find what one lot loses per pip or point on your broker's contract specification.
- Take the widest stop you expect from the room and divide your loss limit by loss per pip times that distance.
- Round down, and use the smallest result as the ceiling if one ceiling must cover several instruments.
If you copy one room for gold and another for forex pairs, one compromise number may be too tight for one and too loose for the other. Contract sizes differ between brokers too, so a ceiling that is sensible at one broker is not automatically sensible at another. Check it on the account it will run on.
Does a ceiling interact with the take profit split?
It does, and it is worth testing. CopySignals can split a trade across the targets with custom weights, closing part at each one. A ceiling is applied to the volume of the trade, and a small volume split into several parts can run into your broker's minimum lot step. A 0.03 lot position divided three ways is 0.01 each at best, and a position that small cannot be split into the weights you asked for. If you use weighted targets, make sure the ceiling leaves enough volume to divide. The split itself is explained in how to split take profits across targets.
Is a maximum lot the same as a cap on open positions?
No. The maximum lot limits the size of one trade. A cap on open positions limits how many you hold. A prudent account has both, because ten trades at the ceiling is a very different exposure from one. The count side is in capping open positions. On a funded account, where a daily loss limit counts everything open together, the two settings work as a pair, and our article on prop firm rules and trade copiers goes into the account side.
How to set and test a maximum lot on CopySignals
- Work out the ceiling from your single trade loss limit, as above.
- Connect a demo account at the same broker and account type as the live one.
- Set the ceiling deliberately low, lower than your sizing rule would normally produce.
- Let a few signals through, then open the event log and compare the volume of each order with what the rule asked for.
- Raise the ceiling to your real figure and repeat with one signal that has a tight stop.
- Go live at a small size with the same ceiling, and keep it on every account you add.
Testing first costs nothing, and we make the case in copy signals to a demo account first.
What we do not do
CopySignals supports MT4, MT5 and eTrader only. No other trading platform is supported. We are not a broker and give no advice on what size to trade, so the number is yours to choose. The copier places, modifies and closes orders on the accounts you connected, and nothing else.
What it costs
Starter is $14 a month, Basic is $29 and Pro is $149, with Business by email above that. Every plan is the whole product, so the maximum lot is on all of them. Plans differ only in how many trading accounts and Telegram accounts they cover. Billing is monthly by card or crypto, you can cancel any time, and there is a 30 day money back guarantee. See the pricing page.
Set the ceiling before you connect the first live account, not after the first surprise. Pick it from your own loss limit, and test it on demo with a tight stop.