Tools / Position Size Calculator

Forex Position Size Calculator

Size every trade from the loss you are willing to take, not from the margin your account allows.

Free · no signup · works across every supported market
live rates
Instrument
Account currency
Account balance
Risk per trade
Stop loss (pips)
Take profit (pips) optional
Leverage optional, caps size + shows margin
0.50lots
5.0 mini50 micro50,000 units
Risk amount$100.00
Pip value at this size$5.00
Position value$58,092.00
Margin required$1,161.84

If your stop moves

10 pips1.00
15 pips0.66
20 pips0.50
30 pips0.33
40 pips0.25
risk stays $100.00 at every size

You sized this at 1.0% risk. Do you hold that line on every trade?

Connect your account and Helix AI flags every trade where you sized past your own rule - automatically, on your real fills.

Check my real risk discipline
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New to this? Read the position sizing explainer in plain English.

Risk comes before lot size

A position size is the bridge between your stop and your account. Choose the money or percentage you can lose, measure the distance to the stop, then let the instrument's pip, point, or tick value determine the size. The same setup can require a very different lot size when volatility changes.

The formula

Position size = risk amount / (stop distance × value per point at one unit). The calculator also converts cross-currency pairs and applies contract specifications for futures, metals, indices, oil, stocks, and crypto.

Leverage is a capacity limit, not a risk plan

Leverage decides how much margin a position requires. It does not decide how much you lose at the stop. Set risk from the stop first, then use leverage only to confirm that the position fits inside the account's available margin.

Frequently asked questions

What do I need to calculate position size?
Your account balance, the percentage or fixed amount you are willing to lose, and the distance from entry to stop. The tool uses the instrument's contract and conversion data to return the size.
How do I size a trade at 1% risk?
Multiply your balance by 1%, then divide that risk amount by the money value of the stop distance. On a $10,000 account, 1% is $100. A 25 pip stop worth $10 per pip per lot produces 0.40 lots.
Does it work beyond forex?
Yes. Futures use contracts and tick values, stocks use shares, and metals, indices, oil, and crypto use their own contract sizes. The risk formula stays the same.
Do I need a TradeDNA account?
No. The calculator is free and standalone. A TradeDNA account adds the next step: comparing the risk you planned with the size you actually traded.
Forex Position Size Calculator - Free Lot Size Tool | TradeDNA