Fixed-size versus balance-proportional trade copying

Enabling trade copying does not establish the size at which each signal enters your account. Two configurations following the same provider can create different exposures. Before comparing profits and losses, identify whether order size comes from a fixed setting or a ratio involving capital and the source order.

What exactly is fixed?

One system may define fixed size in lots, while another uses order value or committed-capital limits. These units are not equivalent. Establish whether the setting applies per instruction, per instrument or across all positions. A short settings label is insufficient without a worked calculation and instrument specifications.

Proportional copying depends on the ratio definition

A model may multiply the source order by the follower-to-source balance ratio. Another may use equity, allocated capital or an independent multiplier. The update time matters too: deposits, withdrawals and open losses can change some of these bases. Do not infer every service’s behavior from one simple formula.

A hypothetical comparison

Suppose source capital is 10,000 and follower capital is 2,000. Under a simple capital-ratio model with a multiplier of one, a source order of 0.5 lots becomes 0.1 lots. If the next source order is 1 lot and the reference values remain unchanged, the calculated follower size becomes 0.2 lots. With a hypothetical fixed setting of 0.05 lots per instruction, both orders would instead use 0.05 lots.

These figures are not recommended settings. The example excludes costs, instrument restrictions, rounding and real execution differences. Neither model guarantees profits or a particular safety level merely because the resulting number is smaller or proportional.

Order size is not the same as potential loss

Instrument type, contract value, exit mechanics and distance, leverage and market movements affect the outcome. A fixed lot size across two instruments can produce different monetary sensitivities. Proportional copying can also accumulate more exposure than expected when multiple signals arrive together. Assess risk beyond a single instruction.

Check the smallest executable size

A calculated amount may fall below the minimum or fail to match a permitted size increment. The service may reject it or apply its own rounding rule. Establish that behavior and any upper limit: rounding upward can change the intended proportion. A missing trade should not automatically be treated as a signal-delivery failure.

What should be recorded before changing settings?

• The sizing unit, ratio basis and calculation time.
• Multipliers, minimum and maximum size, and simultaneous exposure limits.
• Behavior after deposits, withdrawals or changes in source capital.
• Treatment of existing positions when settings change.
• Proposed, accepted and executed quantities for each request.

In copy-trading account information, distinguish the sizing method from the service’s brand. Consult the platform guides for available processes. This article explains settings rather than recommending a multiplier or additional capital. Changing a configuration does not automatically repair earlier losses.