Trader Toolkit · Calculator

Position Size

From the risk you accept to the size you trade.

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From the stop and from the stake,comes the size that you should take.

Your figures

Result

Account balance

Account currency

Risk on this trade

Share of the balance lost if the stop is reached.

Stop distance (pips)

From entry to stop loss.

Instrument

1 standard lot = 100,000 EUR

Back to inputs

Position size

0.40lots

40,000 units of EUR/USD

Amount at risk

100.00 USD

1% of the balance

The dark segment is the part of the balance lost if the stop is reached: 100.00 USD of 10,000.00 USD. 9,900.00 USD would remain.

Value of one pip at this size: 4.00 USD
Rounded down to 0.01-lot steps: 0.40 lots
Amount at risk at the rounded size: 100.00 USD

Include trading costs

Optional. Type the figures from your own account’s conditions: nothing here is prefilled, nothing is taken from GIO4X’s conditions and nothing is stored. A field left blank counts as zero.

Your costs

Spread (pips)

From your own account’s conditions.

Commission per lot

From your own account’s conditions. In USD.

Commission charged

Nights held

Your own plan for the trade. Zero if it closes the same day.

Swap per lot, per night

From your own account’s conditions. Negative = a credit.

Cost of the trade at 0.40 lots: –
Cost as a share of the amount at risk: –
Loss if the stop is reached, costs included: –
Size that keeps loss and costs together at 1%: –
That size, rounded down to 0.01-lot steps: –

Enter at least one cost above. The figures then appear here.

The working, with your costs

The working appears here once the tool has a result and at least one cost is entered.

Open these figures in the Cost Lab

The position size, the instrument and the account currency carry over. The spread, commission, nights and swap are not shared between tools, so they are typed again there; the Cost Lab takes commission in US dollars.

SimulationA calculation on the figures you entered. It does not say what size to trade. Educational information, not investment advice or a recommendation to trade.

How it works

Formula

lots = (balance × risk %) ÷ (stop in pips × pip value per lot)

With your numbers

1Amount at risk10,000.00 × 1% = 100.00 USD
2Value of one pip on one lot0.0001 × 100,000 = 10.00 USD
3Loss on one lot if the stop is reached25 pips × 10.00 = 250.00 USD
4Position size100.00 ÷ 250.00 = 0.40 lots
5In units of the underlying0.40 × 100,000 = 40,000

Assumptions

The stop is filled exactly at its level. In a fast or gapping market a stop can be filled beyond it, and the loss is then larger than the amount shown.
Spread, commission and overnight financing are left out. The Cost Lab adds them up.
“Include trading costs”, beneath the result, adds your own figures for them to this trade. It treats the stop distance as measured before the spread; if you measured it from the price you would actually be filled at, the spread is already inside the distance and belongs at zero there.
Position sizes are shown exactly and rounded down to 0.01 lots, the smallest published trade size.
The starting figures are placeholders that make the arithmetic visible, not suggested values.

Terms used

In plain language

Size follows from risk, not the other way round.

Most sizing mistakes come from choosing a number of lots first and discovering the risk afterwards. This calculator runs in the opposite direction. You state how much of the balance you are prepared to lose on one trade and how far away the stop is; the size is whatever makes those two statements true together.

A wider stop does not mean more risk if the size shrinks to match, and a tight stop does not mean less if the size grows. The amount at risk is the one figure that stays fixed, which is why it is drawn as a share of the balance.

The result assumes the stop is filled at its level. In a gap it may not be, so the amount shown is the planned loss rather than the largest possible one.

Continue

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How it works

Formula

lots = (balance × risk %) ÷ (stop in pips × pip value per lot)

With your numbers

1Amount at risk10,000.00 × 1% = 100.00 USD

2Value of one pip on one lot0.0001 × 100,000 = 10.00 USD

3Loss on one lot if the stop is reached25 pips × 10.00 = 250.00 USD

4Position size100.00 ÷ 250.00 = 0.40 lots

5In units of the underlying0.40 × 100,000 = 40,000

Assumptions

The stop is filled exactly at its level. In a fast or gapping market a stop can be filled beyond it, and the loss is then larger than the amount shown.

Spread, commission and overnight financing are left out. The Cost Lab adds them up.

“Include trading costs”, beneath the result, adds your own figures for them to this trade. It treats the stop distance as measured before the spread; if you measured it from the price you would actually be filled at, the spread is already inside the distance and belongs at zero there.

Position sizes are shown exactly and rounded down to 0.01 lots, the smallest published trade size.

The starting figures are placeholders that make the arithmetic visible, not suggested values.

Terms used