Lot multiplier copy trading: how to set the number
A lot multiplier repeats the master's lot at a fixed ratio on every follower. How it is worked out, where it drifts, and when to use proportional sizing instead.
Lot multiplier copy trading means every trade on the master account is repeated on a follower with its lot multiplied by one fixed number you choose: 0.5 halves the master's lot, 1 matches it and 2 doubles it. The multiplier never looks at either balance, which makes it the simplest way to size a follower and the one that drifts furthest when the accounts stop growing at the same pace.
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. The same product is an MT4 and MT5 trade copier that mirrors one of your connected accounts onto the others, and the lot multiplier is one of the four ways it sizes what lands on each follower.
What is a lot multiplier in a trade copier?
It is a number applied to the master's lot, set separately on each follower. The master opens 0.40 lots, a follower with a multiplier of 0.5 opens 0.20, a follower with 2 opens 0.80. If the master adds a second position of 0.10, the follower repeats it at 0.05 or 0.20. Nothing else enters the calculation.
The idea is not unique to us. The home page of Social Trader Tools shows example follower accounts labelled "Lot multiplier × 2.0", "Fixed lot size 2" and risk multipliers by balance and by equity, so the same family of choices exists there. MetaCopier describes a different route on its home page: its risk per trade feature "automatically adjusts the lot size based on your stop loss and tick value".
Where does the multiplier apply in CopySignals?
Only when the source is a connected trading account. A Telegram room's post gives an entry, a stop and targets, but no lot, so there is nothing to multiply. For rooms you use a fixed lot or a percent of the account measured against the signal's own stop, which our piece on risk percent lot size works through.
When the source is one of your own accounts, the four methods are these, each set per following account and each capped by that account's maximum lot:
| Method | What sets the lot | Works from a room |
|---|---|---|
| Fixed lot | The same lot on every trade, whatever the master did | Yes |
| Percent of the account | Balance and the distance to the stop | Yes |
| Lot multiplier | The master's lot times your number | No, needs a master account |
| Proportional to balance | The master's lot scaled by your balance against the master's, with a percentage on top | No, needs a master account |
When is a lot multiplier the right choice?
It fits two accounts you expect to stay a fixed ratio apart, or a follower where you want to say the ratio yourself instead of letting the balances decide. A trader who runs a personal account by hand and wants a second account at half the size, forever, has no reason to use anything more elaborate.
It also fits a follower whose purpose is a copy at a defined size, such as a demo account that shadows the master at the same lot, which is a multiplier of 1. The follower does what the master does, only the number differs.
Where it fits badly is a pair of accounts with different growth. Say the master holds 20,000 USD and the follower 4,000 USD, and you set 0.2 to match. Six months later the follower has been topped up to 8,000 USD while the master is unchanged. The multiplier is still 0.2, so the follower now carries a smaller share of its account than it did on day one, and nothing in the copier tells you. Proportional to balance exists for that case, because it moves with both balances.
How do you pick the number?
Start from the loss you accept on the follower, not from the master. Take the master's usual lot and the usual stop distance, work out what that trade loses on the follower at multiplier 1, and scale from there. Here is an invented example, to show the arithmetic and not a real trade. The master trades 1.00 lot on gold with a stop that costs 400 USD at that size. Your follower can accept losing about 80 USD on that trade, so the multiplier is 80 divided by 400, which is 0.2, and the follower opens 0.20 lots.
Check the result against the follower's own symbol specification. Two brokers can differ in contract size, and a lot of the same size is then not the same money. The lot ratio looks right while the risk ratio is off.
What does rounding do to a small multiplier?
Brokers accept lots only in steps, commonly 0.01, with a minimum below which an order is refused. Multiply a master lot of 0.03 by 0.2 and the exact answer is 0.006, which is under that step. Depending on how the broker treats it, you get either no trade or one rounded up to the minimum, which is five times what you intended. This catches people who copy a small master onto a smaller follower.
The maximum lot is the setting to fill in first, because it caps the other direction. A multiplier of 2 on a master who occasionally trades a large lot gives a very large lot, and the cap is what stops it reaching the account. The event log records each decision with its reason, so after a few days on a demo account you can compare each follower's lot with what you calculated by hand. See the event log guide for how to read it.
Can one master feed followers with different multipliers?
Yes. Size belongs to each following account, not to the copier, so one master can feed a follower at 0.5, another at 1 and a third at 2, across MT4, MT5 and eTrader and across brokers. Symbol renames, prefix and suffix are also per account. Our guide to copying trades between accounts you own covers the connection side, and copying one signal to several accounts shows the same idea from a Telegram room.
If one of the followers is a funded prop firm account, its multiplier is a risk decision against that firm's loss limits, and whether the copying is allowed at all depends on the firm's terms. Read them first. Trading carries risk, and a larger multiplier is a larger loss on the same bad trade.
What CopySignals does not do here
CopySignals connects MT4, MT5 and eTrader accounts only. If a follower sits on another platform, a copier that lists that platform on its own site is the place to look. The multiplier also cannot size a Telegram signal, for the reason above.
If your accounts stay a fixed ratio apart, set the multiplier, set the maximum lot, and test on demo. If they will not, use proportional to balance. Every plan includes all of these methods, and the pricing page shows how many accounts each covers.
Sources
- Social Trader Tools home page, Social Trader Tools, checked 5 October 2026
- MetaCopier home page, MetaCopier, checked 5 October 2026