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The Lot Size Calculator

Dollar-risk-first sizing for forex, done for you. Set the risk you'll accept and the size of your stop, and it returns the position size in lots that makes that stop equal your risk — with the pip value converted into your account currency.

How to use it

Decide your risk first — a fixed % of the account (or a flat amount). Place the stop where the idea is invalid (the swept level plus a buffer), read its size in pips off your chart, and let the calculator set the lots. Never widen the stop to fit a size you want. If even one micro-lot risks more than your budget, tighten the stop or skip the trade.

Your inputs are saved on this device. Cross-currency conversion uses live ECB reference rates; if they can't load, the conversion rate becomes editable so the tool still works. The math: lots = risk ÷ (stop in pips × pip value per lot), pip value taken in your account currency and rounded down to 0.01 lots.

The order never changes
Risk → stop → size. Decide the risk, place the honest stop, let the calculator set the lots. Working backwards — picking a lot size and then squeezing the stop to fit — is how you get stopped out of winners. If you don't like the stop, don't take the trade.

How pip value works

A pip is the standard price increment: 0.0001 on most pairs, 0.01 on JPY pairs. On one standard lot (100,000 units), one pip is worth 10 units of the quote currency (1,000 on JPY pairs). If the quote currency isn't your account currency, that value is converted at the current exchange rate — which is why the account-currency selector matters.

LotUnitsPip value (non-JPY, quote ccy)
Standard100,00010 / pip
Mini10,0001 / pip
Micro1,0000.10 / pip

Sizing in 0.01-lot (micro) steps is what lets you risk a precise amount and scale out granularly — the same idea as trading micro futures.

A calculator, not a green light
The lot size is only valid after the trade has passed every gate — bias, order flow, target, a logical stop, and the grade. Sizing is the last step, never the reason to take a trade.
Gold & index CFDs
This tool is for currency pairs, where a pip is well defined. Gold (XAU) and index CFDs are sized on their $-per-point value instead — same dollar-risk-first order, different unit. See Markets & Mechanics.

Keep these to hand

The tools you run every session.

Run it live

The Pre-Trade Checklist

Every make-or-break gate, in order — sizing is the last line. Saved per device.

Primer

Markets & Mechanics

What you trade and how it's priced — pairs, pips, lots, leverage, spread — and where dollar-risk-first sizing comes from.