Sizing copies proportional to balance

Proportional to balance sizing scales a master account's lot by the ratio of your balance to the master's, so a 5,000 USD account and a 50,000 USD account copying the same trade end up with lots ten times apart, in that same proportion. It is one of the sizing modes behind proportional lot copy trading between your own accounts, and it only applies when the source of the trade is a connected master account, not a Telegram room, because a room's post carries no lot of its own to scale.

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 engine also mirrors a master trading account onto every other connected account, across brokers and platforms, and proportional to balance is one of the ways to size what lands on each one. This page works through the formula, a worked example, and where it fits against the other sizing modes.

What does proportional to balance mean?

It means the destination account's lot is not fixed and not a flat multiple of the master's. It moves with your own balance against the master's, so the relative size of the position stays similar even when the two accounts are far apart in size, and even as either one grows or draws down over time. CopySignals sizes this per account: the master's lot scaled by your balance against the master's, with a percentage you set on top of that ratio.

This sits alongside the other sizing modes: a fixed lot on every trade, a percent of the account measured against the signal's own stop loss, a multiple of the master's lot, or this balance-scaled option. The first two work from a Telegram room as well as from a master account. The lot multiplier and the balance-scaled mode both need a master account's lot to scale, which is why they belong to account to account copying rather than to a room. Our article on risk percent sizing goes through the percent-of-account method in the same detail this page gives balance scaling.

How is a proportional lot size worked out?

The lot on your account is the master's lot, multiplied by your balance divided by the master's balance, multiplied by the percentage you set. At 100%, your account takes the same relative position as the master. Above or below that, you run larger or smaller than a strict ratio would give.

Here is an invented example, to show the arithmetic and not a real trade. The master account holds 20,000 USD and opens 1.00 lot on a signal. Your account holds 4,000 USD, so the balance ratio is 4,000 divided by 20,000, which is 0.2. At 100%, your account takes 0.2 lots. If you set the percentage to 50%, meant to run the copy gentler than a strict ratio, your account takes 0.1 lots instead. Your broker then rounds to its own lot step, commonly 0.01, before the order is placed.

Two accounts at different brokers rarely share a contract specification, and the ratio only tracks the lot, not the money at risk. A lot of the same size can lose a different amount at two brokers if the contract size or the account currency differs, so the same relative lot is not always the same relative risk. Read the symbol specification on both accounts before you trust the ratio to mean what it looks like it means.

Proportional to balance vs a lot multiplier: what is the difference?

A lot multiplier fits two accounts you expect to stay a fixed ratio apart, or where you want to decide the ratio yourself rather than have it follow the numbers. Proportional to balance fits two accounts you expect to move independently, a personal account you add funds to, or a prop firm account that steps up in size on a scaling plan, where you want the relative size to track the current balance rather than the one you set the copier up with.

Where account to account copying uses this

Any connected trading account can be the master, and its positions mirror to every other connected account at its own size, across brokers and platforms. A common shape is a personal account you trade by hand as the master, mirrored to a funded account at a different size, or the other way round, a funded account's trades mirrored down to a smaller personal one. Our guide to copying several prop firm accounts you own covers sizing each destination against its own balance and loss limit when there is more than one funded account behind the same master, and copying trades between MT4 and MT5 covers the case where the master and the destination sit on different platforms.

Whether copying between your own accounts is allowed depends on the terms of whichever account is funded, not on the copier. Read the firm's rules before connecting anything, and set the sizing only once you know what is permitted.

What limits still apply

A maximum lot on the destination account holds regardless of what the ratio produces, and it is the setting to make first. A wide gap between two balances, or a master lot larger than usual, can otherwise scale into a lot you did not intend, and the cap is what stops it reaching the account. A cap on open positions matters the same way when the master opens several positions close together, since each one scales on its own and the total can stack faster than a single trade would suggest.

Symbol names are a separate problem from sizing. The master and the destination rarely quote the same instrument under an identical name, so the symbol rename and the prefix or suffix still need setting per account regardless of which sizing mode you choose. A correctly scaled lot sent to a symbol name the destination does not list is simply rejected, and the event log shows it as skipped rather than placed at the wrong size.

What to check on a demo account first

• Confirm both accounts' balances are what you expect them to be before you calculate the ratio by hand and compare it with what the copier places.
• Open the symbol specification on the destination account and check the contract size, since a matching lot is not a matching risk if the contract differs.
• Set the maximum lot on the destination before the first live trade, not after.
• Read the event log for a handful of master trades and check the lot the copier chose against the arithmetic above.

Run this for a few trades at a reduced percentage before you raise it to the ratio you actually want, since a mistake in a balance figure or a contract size shows up as a wrong lot rather than an error message.

Every CopySignals plan includes the whole product, account to account copying and all four sizing modes among them. Starter is $14 a month for one trading account, Basic $29 for three, and Pro $149 for thirty, with Business available by email for more accounts. There is a 30 day money back guarantee, and the details are on the pricing page. If your two accounts are meant to move together as one grows or shrinks, set proportional to balance and cap the lot on the smaller side. If you would rather choose the ratio yourself and keep it fixed, a lot multiplier does that instead. The MT4 MT5 trade copier page covers the account to account side of the product in full.