Free tool
Lot Size & Risk Calculator
Find your lot size from account balance, risk and stop-loss — for forex, indices, metals or any CFD. Plus copy-sizing for traders running several accounts — most often prop-firm evaluation and funded accounts.
Size every trade to a fixed share of your account: enter your balance, the percentage you'll risk, and your stop-loss distance — the calculator returns the lot size and the dollar risk at the stop. Switch to Copy sizing to scale one trade across accounts of different sizes by equity-ratio or a fixed multiplier — the same arithmetic Trepeat's engine runs on every copy.
Position size
0.50lots
Target risk (requested)
$100.00
For information only — this is an arithmetic tool, not trading advice. The value per pip/point depends on the instrument + account currency; the default ($10/point per lot) is ≈ a USD-quoted FX major — set your own for JPY pairs, indices, metals or crypto.
Example
One source, scaled to every follower.
A single 1.00-lot trade on a $50,000 source account, sized to each follower by equity-ratio.
| Account | Equity | Lot |
|---|---|---|
| Source | $50,000 | 1.00 |
| Follower A | $100,000 | 2.00 |
| Follower B | $25,000 | 0.50 |
| Follower C | $10,000 | 0.20 |
With Equity ratio sizing, each follower scales by its equity — no per-account maths, no manual lot entry. Trepeat does it on every trade.
Lot size calculator — common questions
How do I calculate position size from risk?
Position size = (account balance × risk %) ÷ (stop-loss in pips/points × value per pip/point per lot). Example: risking 1% of a $10,000 account over a 20-point stop at $10/point → 0.50 lots. The 'Position size & risk' mode does this for you and shows the dollar risk. Works for forex, indices, metals or any CFD — just set your instrument's value per point.
What does risk % mean?
It's the share of your account you'd lose if the trade hits its stop-loss — 1% of a $10,000 account is $100. The calculator turns that into a lot size; it doesn't recommend a number, that's your decision.
How does equity-ratio sizing work?
The follower lot is the source lot multiplied by (follower equity ÷ source equity). A follower with twice the source's equity opens twice the size; one with half opens half. It's pure proportion — the calculator uses the same equity ratio as the live engine, which also adjusts for each broker's contract size and lot step.
What's the difference between equity-ratio and a fixed multiplier?
Equity-ratio auto-scales every follower to its own account size from one rule. A fixed multiplier applies the same multiple to every follower regardless of balance (e.g. 0.5× always halves the source lot). Pick equity-ratio when accounts differ in size, multiplier when you want a uniform scale.
How is the dollar risk calculated?
Risk is the follower lot × your stop-loss distance (pips/points) × the value per pip/point per lot. The default ($10/point per lot) is ≈ a USD-quoted FX major; it varies by instrument and account currency, so set your own for JPY pairs, indices, metals or crypto. It's arithmetic, not advice.
Does it account for the broker's minimum lot?
It assumes the standard 0.01-lot step: results are rounded to 0.01, and anything below that is flagged — the live engine skips a copy that small rather than placing an invalid order. If your broker or symbol has a higher minimum, check its contract specs.
Does Trepeat apply this automatically?
Yes — this is exactly what a repeater does. You set the sizing rule (equity-ratio or multiplier) and an optional max-volume cap once per repeater, and every follower is sized by that rule on each trade. The calculator just shows the arithmetic up front.
All questions — pricing, the trial, copying and safety — are in the Help Centre. Still stuck? Email support@trepeat.com.
Stop sizing copies by hand.
Set one sizing rule per repeater and every follower is scaled automatically on each trade.
Free trial on cTrader · 1 week · up to 3 accounts · no card
MT4 and MT5 connect as soon as you subscribe.