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Risk & position sizing

Lot Size Calculator

Convert a position size into standard, mini and micro lots for your broker.

Inputs it asks for
Account balance currency
Risk per trade %
Entry price price
Stop loss price
Formula shown · assumptions disclosed

What it computes

Convert a position size into standard, mini and micro lots for your broker. The page states the equation, the units it expects and the rounding it applies, so the result can be reproduced by hand.

Where it sits in the chain

A calculator gives you a number. This one feeds the next: account to risk, risk to position size, position size to the trade, and the trade to expectancy, drawdown and risk of ruin.

See the performance tools →
Inputs
Result
Risk amount $250
Lot size 0.50 lots
In units 50,000
Mini lots 5.0
Micro lots 50
Ignores spread and commission. The Position Size Calculator subtracts those from the risk budget first.
Save this result to your dashboard. Save

More in risk & position sizing

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Position Size Calculator

Turn an account balance, a risk percentage and a stop distance into a size in lots, shares or contracts.

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Risk Calculator

The maximum you should lose on one trade, before anything else about the trade is decided.

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Stop Loss Calculator

Work backwards from accepted risk and a fixed size to the stop distance that fits.

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Risk/Reward Calculator

Compare reward with risk, and read off the win rate that ratio needs to break even.

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Quantify the trade, then keep the record.