tool · Platforms & automation
Copy Lot Ratio Calculator for Matching Contracts
This calculator illustrates equity-proportional lot sizing when both accounts use matching exposure units. It applies a chosen multiplier and rounds down to the follower increment without connecting or configuring accounts.
Key points
- Both equity values must be on a common currency basis.
- Matching lot labels do not prove matching contract exposure.
- The educational result does not establish a copier’s actual rounding or sizing policy.
Equity-proportional copy lot calculator
The starting numbers are illustrative inputs. Replace them with a consistent scenario. Calculations run in your browser; no account connection or live market data is used.
Formula and boundaries
Raw follower lots = source lots × follower equity ÷ source equity × chosen multiplier. Round down to the entered follower increment.
- This example assumes matching instrument exposure, lot contract size and currency basis across both accounts.
- A same-size lot on different contracts or symbols may have a different monetary sensitivity; this ratio does not validate that mapping.
- The selected multiplier is a hypothetical input. This calculator does not connect accounts or reproduce every copier configuration.
Understand the conditional formula
The model starts with follower equity divided by source equity. It multiplies source lots by that ratio and by a separately chosen multiplier. The final amount is rounded down to the follower volume increment. Source equity and the increment must be positive; the remaining numerical inputs can be zero to describe a zero-size scenario.
This relationship assumes identical monetary sensitivity per lot after currency normalization. MetaQuotes exposes contract size, volume limits and volume step as separate properties. Those properties are why a ratio of account equity alone cannot validate a symbol mapping.
Work an example through rounding
Assume source equity of 12,000, follower equity of 4,500, source position size of 0.80 lots, a hypothetical multiplier of 0.75 and follower increment of 0.01. The equity ratio is 4,500 ÷ 12,000 = 0.375. Raw follower size is 0.80 × 0.375 × 0.75 = 0.225 lots.
Rounding down to the entered step gives 0.22 lots. Relative to the unrounded scenario, 0.005 lots are omitted. With a coarser 0.10 step, the same model would produce 0.20 lots. Neither example chooses an appropriate multiplier; it only shows how a supplied choice interacts with discretized volume.
Check what “same contract” means
Compare underlying instrument, units per lot, tick size, tick value, quote and settlement currencies, expiry where relevant, and price-conversion rules. A familiar symbol prefix does not settle these questions. A broker's smaller contract can have the same visible price but a different cash movement for one lot.
Also normalize account currencies before taking the equity ratio. Dividing 5,000 GBP by 10,000 USD without conversion does not produce a dimensionless measure of relative capital. Conversion timestamps can matter when exchange rates change. Use comparable equity measurements and document treatment of credit or pending costs rather than combining unlike balances.
Distinguish a worksheet from live copying behavior
A copier may use balance, equity, fixed volume, risk settings or another sizing policy. It may reject an order below the minimum, cap volume or round differently. This tool does not claim that every TradeCopier configuration implements this exact formula. Confirm the available setting and observe controlled account records before relying on a particular result.
The calculation also omits stop distance, aggregate open risk, margin, partial fills and a source trade's later modifications. Deposits or withdrawals can change the ratio between trades. If the rounded result is zero, the scenario cannot represent a positive order at the selected step; the interface does not round upward to manufacture one. Keep the raw and rounded quantities with the assumptions so discrepancies can be diagnosed rather than attributed automatically to latency.
Questions and answers
Will this configure my TradeCopier account?
No. It is an educational calculation performed in the browser. Review the actual product settings and broker requirements before configuring an account.
Can I compare a standard contract with a smaller contract directly?
Not using raw lot numbers alone. First establish equivalent monetary sensitivity, contract units and currency basis; otherwise the assumed matching-contract formula is invalid.
Sources and further checks
Use the current source for your exact instrument, account and platform. Referencing a general specification does not establish support for every TradeCopier workflow.
- MetaQuotes: instrument and volume properties · Checked September 19, 2026
- MetaQuotes: account properties · Checked September 19, 2026
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