Position Sizing: Turning a Risk Percentage into a Lot Size

Risk first, lot size second

Decide what you are willing to lose on the trade before you decide how big the trade is. That figure is your risk. Most traders express it as a percentage of the account, because a percentage survives a small account and a large one.

The calculator on this page takes that percentage, your account balance and the distance from your entry to your stop loss. It returns a lot size. A lot is the standard unit of trade size in forex, and the calculator converts your risk into the number of lots that fits it.

If you skip the stop loss, there is nothing to size against. The stop is the part of the plan that says the trade was wrong. Without it, position sizing is guesswork.

Why the stop distance changes everything

A wide stop means a smaller lot for the same risk. A tight stop means a larger lot. The money at risk stays the same; only the size changes. This is the part new traders find backwards, because a tight stop feels safer but allows a bigger position.

That is also why a pip value matters. A pip is a small standard move in a currency pair, and pip value is what one pip is worth in your account currency at your trade size. The calculator handles that conversion. You supply the stop distance in pips and the risk percentage.

Check the pip value your broker actually uses before you trust any output. It can differ by pair and by account type. The broker's contract specifications page is the place to confirm it.

What to check before you trust the number

Make sure the account balance you enter is the balance you can actually trade, not the number you hope to have next month. The calculator cannot see your open positions. If you already have risk on the book, add it to the figure yourself.

Confirm the lot size your broker allows. Some brokers set a minimum and a step size, so the exact number the calculator returns may not be orderable. Round down to the nearest allowed size rather than up, because rounding up increases your risk.

For Ugandan traders, funding usually moves through Mobile Money, with MTN MoMo and Airtel Money the common rails. Bank transfer and card are also used. Fees and limits sit with the provider, so check the Mobile Money app or the broker's funding page rather than assuming.

Regulation and timing in Uganda

The Capital Markets Authority of Uganda is the regulator to check. Its public list of licensed persons is at cmauganda.co.ug. Whether online forex dealing is covered by that licence needs confirmation on the register itself, so look up the specific firm before you fund anything.

Session timing affects how stops behave. In East Africa Time, Sydney runs 01:00 to 10:00, Tokyo 03:00 to 12:00, London 11:00 to 20:00 and New York 16:00 to 01:00. The London and New York overlap is 16:00 to 20:00 EAT, when moves are often fastest.

A stop placed for a quiet hour can be hit quickly in a busy one. Size for the session you are actually trading, not the calmest one you remember.