Risk percent lot size on a signal copier
The lot comes from your balance, the percentage you risk and the stop in the signal. Here is the arithmetic, when it beats a fixed lot and what to test first.
A risk percent lot size on a signal copier is worked out from three numbers: your account balance, the percentage you are willing to lose, and the distance between the entry and the stop loss in the signal. The lot is the amount at risk divided by what one lot loses over that distance, so a tight stop gets a bigger lot and a wide stop gets a smaller one.
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. Percent of the account is one of its four sizing methods, and this page shows the arithmetic behind it, when it beats a fixed lot and where it misleads you.
How is a risk percent lot size calculated?
Take the money you accept losing on the trade, and divide it by the loss one lot takes if price travels from the entry to the stop. The result is the lot, before your broker rounds it.
The formula in one line: lot = balance x risk% / (stop distance x value of that distance per lot). The value per lot depends on the instrument, the contract size your broker uses and the currency of your account. That last part is where people slip, so the two examples below state every assumption. Both are invented, to show the arithmetic. Neither is a real trade.
EURUSD first. The account holds 5,000 USD, you risk 1%, so 50 USD is at risk. The room posts a buy with a stop 30 pips away. Assume a 100,000 unit lot, which makes one pip worth 10 USD per lot on a USD account. One lot loses 300 USD over 30 pips. 50 divided by 300 is 0.1667 lots. Brokers accept lots in steps, commonly 0.01, so the lot becomes 0.16 and the real risk is 48 USD, slightly under the target because the rounding goes down.
Then XAUUSD. Same account and same 50 USD. The room posts a stop 5.00 USD of price away. Assume your broker's contract is 100 ounces, so one lot loses 500 USD over that move. 50 divided by 500 is 0.10 lots. Contract size for gold differs between brokers, so read it in the symbol specification on your own account before you trust any lot figure, ours included.
Why does a fixed lot risk a different amount on every signal?
A fixed lot risks whatever the stop happens to cost, and rooms rarely use the same stop twice. Fixed 0.50 lots on EURUSD is 5 USD a pip. A 15 pip stop puts 75 USD at risk, and a 60 pip stop on the next signal puts 300 USD at risk, four times as much, with no change to your settings.
A room posting scalps in the morning and swing setups in the afternoon makes the gap wider. The fixed lot that felt gentle on the scalps is the one that hurts on the swings. Percent risk removes that variance: the stop distance is in the formula, so the money at risk stays near the same figure and the lot moves instead.
The reverse also holds. Fixed lot is simple, and it is what you want when you would rather know your exposure in lots than in money, for example when your broker's margin is what limits you. Neither method is correct for everyone.
Which sizing methods does CopySignals offer, and when does each fit?
There are four, set per trading account, and each is capped by that account's maximum lot. The same signal can therefore go to a small account and a large one at different sizes without the room knowing.
| Method | What sets the lot | Fits when |
|---|---|---|
| Fixed lot | The same lot on every trade | You think in lots, and the room's stops are similar in size |
| Percent of the account | Account balance and the distance to the signal's own stop | Stops vary and you want the money at risk to stay steady |
| Lot multiplier | The master's lot times a number you choose, 0.5 halves it, 2 doubles it | You copy another account and want a fixed ratio to its size |
| Proportional to balance | The master's lot scaled by your balance against the master's, with a percentage on top | Your account is a different size from the master and you want the same relative risk |
Multiplier and proportional sizing follow a master account, which is the account to account side of the product. For a Telegram room there is no master lot to follow, so fixed lot and percent of the account are the two you will choose between. The Telegram trade copier setup guide covers where sizing sits among the other settings.
What does the risk percent method need from the signal?
It needs a stop loss. The lot is measured against the signal's own stop, so a post with an entry and targets but no stop gives the formula nothing to divide by. If a room often leaves the stop out, percent risk is the wrong method for it, and fixed lot with a low maximum lot is the honest alternative.
Wide stops shrink the lot. A room that posts a 200 pip stop next to a 30 pip first target gets a small lot under percent risk, so the copied trade earns a small fraction of what the room's screenshot shows when the target is hit. That is the method working as designed, and you should know it before you watch the first trade.
An entry zone adds a wrinkle. The distance from your fill to the stop is not the same at the top of the zone as at the bottom, so the risk you end up with can differ a little from the figure you set. Slippage and spread work the same way: they move your real entry, and the stop stays where it was. Treat the percentage as a target for the size, not a promise about the loss.
How do risk percent, several targets and break even fit together?
The percentage applies to the whole position, and the take profit weights then divide that position across the targets. Weights of 50, 30 and 20 on a 0.10 lot trade give 0.05, 0.03 and 0.02, so the risk figure you set is what you carry before any target is reached.
Once a target is hit and the stop moves to break even, the money at risk on what remains drops toward zero, and part of the size has already been closed. The percentage you chose describes the worst case at the start, and the trade rarely stays at it. We explain the mechanics in break even and partial close from signal updates.
One check before you go live: a small lot may not divide into the pieces your weights ask for. A 0.02 lot cannot be cut into three real closes if your broker's step is 0.01. A higher risk percent, or fewer targets, fixes it.
How do you pick the percentage on a prop firm account?
Start from the loss rule of the account, and work backwards. If a funded account has a daily loss limit, the risk per trade times the number of trades that can be open at once has to sit well inside it. Your firm sets the limit and defines how it is measured, so read its rules page and use the figure it gives.
A room that sends several signals in a row can put three or four trades on at once. At 1% each, four trades that all hit their stops cost 4% of the balance. Whether that fits your rules depends on the firm, and CopySignals has a cap on open positions and a maximum lot that let you hold the total down. The guide to copying several prop firm accounts you own goes through how sizing is set per account, so a funded account and a personal one can take the same signal at different risk.
Many traders keep the percentage below what the rules allow, on the reasoning that a slipped stop or a spread spike should not decide whether the account survives. That is a judgement about your own risk, and we do not tell you which percentage to use. Trading carries risk and the loss is yours.
What should you test on a demo account first?
Connect a demo account with the same balance as your live one, set the percentage, and let a handful of signals through. Then compare, for each trade, the lot the copier placed against the lot you get by hand from the formula above.
- Open the symbol specification for the instrument and confirm the contract size and the lot step.
- Check that the symbol on your broker carries the suffix or prefix you set in the symbol renames.
- Read the event log for trades that were skipped, and why.
- Check that the maximum lot stops an oversized trade when a room posts a very tight stop.
The last item deserves a second look. A tight stop makes the formula return a big lot, and the cap is what holds it back. Set it deliberately, per account, before a room posts a 5 pip stop on a Friday.
The plans are Starter, Basic and Pro, monthly, and every plan includes the whole product, sizing included. They differ only in how many trading accounts and Telegram accounts they cover. See the pricing page, and there is a 30 day money back guarantee. If your room posts a stop every time and you want the risk to stay level, choose percent of the account. If it does not, choose fixed lot and cap it.