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MT5 follower sizing

Lot multiplier vs fixed lot size.

TradeMirror supports two follower trade-size methods. This guide shows exactly how each method changes the volume sent with a copied open—and what the calculation does not account for.

Product scope reviewed
1 August 2026
Methods covered
Multiplier and fixed lot
Reading time
6 minutes

Lot multiplier

The multiplier method calculates follower volume from the source volume:

follower lot = source lot × multiplier

With a source trade of 0.20 lot and a multiplier of 0.50, TradeMirror calculates 0.10 lot for the follower. If the source volume changes, the calculated follower volume changes with it.

Fixed lot

The fixed-lot method ignores the source volume for the follower open and uses the configured value:

follower lot = configured fixed lot

With a fixed value of 0.10, the requested follower volume is 0.10 whether the source opens 0.10, 0.20, or 0.50 lot.

Worked comparison

Follower volume requested by two example sizing rules
Source lotMultiplierMultiplier resultFixed-lot result
0.10×0.500.050.10
0.20×0.500.100.10
0.50×0.500.250.10

In these examples the fixed value is 0.10 lot. They explain the calculation only; they do not recommend a position size.

How TradeMirror normalizes the calculated value

The current copy service rounds the calculated volume to two decimal places and applies a minimum of 0.01 before sending the instruction. A broker can still reject or adjust an order when its instrument, lot step, minimum, maximum, margin, or account rules do not accept the requested volume.

Check the follower account.

A mathematically valid value is not proof that a particular broker or instrument will execute it. Verify the actual follower result in MT5 during your test.

What these methods do not calculate

  • They do not size from follower equity or account balance.
  • They do not guarantee the same monetary risk across accounts.
  • They do not account for different contract sizes or symbol specifications.
  • They do not guarantee sufficient margin or successful execution.

TradeMirror's public setup supports multiplier and fixed lot only. It should not be described as percentage-of-equity sizing.

Pre-activation sizing checklist

  1. Confirm the source and every follower account.
  2. Confirm whether the strategy uses multiplier or fixed lot.
  3. Calculate at least one expected follower volume yourself.
  4. Check follower symbol, lot-step, minimum, maximum, and margin rules.
  5. Use the review screen to confirm the saved method and value.
  6. Test the route and verify the actual follower in MT5.

Return to the complete setup guide or review how the copy route works.