Position Size, Pip Value and Margin Calculators
Three calculations that decide whether an account survives its losing streak. Every formula is printed next to the fields, every number comes from you, and none of them forecasts anything.
The order matters. Work out the pip value first. Feed it into the position size. Then check what margin the broker locks.
Position size calculator
Answers one question. How large can this trade be, so that hitting the stop costs exactly what you decided to risk? Work it out before the entry, never after.
Position size (lots) = (Account balance × Risk %) ÷ (Stop loss in pips × Pip value per lot)
The balance you actually trade, not the deposit you plan to make.
The share of the balance you accept losing if the stop is hit.
Distance from entry to stop, measured on the chart.
Take it from the calculator below. It is $10 for most pairs quoted in USD on a USD account.
Position size
0.33 lots
Risking $100.00 (1% of $10,000.00). A 30 pip stop at $10.00 per pip per lot puts the whole risk on 0.33 lots.
Pip value calculator
Converts one pip of price movement into money on your account. The calculator above needs this number. It also shifts when your account currency differs from the quote currency.
Pip value = Pip size × Contract size × Lots × (Quote currency → Account currency rate)
0.0001 for most pairs. 0.01 for pairs quoted in JPY.
100000 for a standard forex lot. Check the contract specification for metals and indices.
The volume you intend to open.
Use 1 when the pair is quoted in your account currency. For USD/JPY on a USD account, use 1 ÷ the USD/JPY price.
Value of one pip
$10.00
One pip moves 10 units of the quote currency on 1 lots. At a conversion rate of 1 that is $10.00 per pip.
Required margin calculator
Shows how much of your balance the broker locks while a position is open. What is left absorbs drawdown before a margin call. That makes this number more useful than leverage marketing.
Required margin = (Contract size × Lots × Price) ÷ Leverage
100000 for a standard forex lot.
The volume you intend to open.
For EUR/USD on a USD account this is the EUR/USD price itself.
Enter 30 for 1:30, 500 for 1:500. Use the limit that actually applies to your account, not the headline figure.
Margin locked
$3,600.00
The position controls $108,000.00 of currency. At 1:30 leverage the broker locks $3,600.00 of your balance while it stays open.
Why position size beats entry timing
A trader who risks 1% per trade survives ten losses in a row with roughly 90% of the account intact. At 10% per trade the same ten losses leave about 35%. Neither figure depends on the pair traded or on how good the entry looked. The difference is the size of the position — the one variable fully under your control before the trade opens.
This is why our Expert Advisor reviews weigh maximum drawdown above total return. A robot that sizes positions by martingale is marked high risk whatever its published equity curve shows. The full weighting is on the methodology page.
Unfamiliar terms? The forex glossary defines pips, lots, margin and stop-out. And anatomy of an order shows what happens once the order reaches the broker.
What these calculators do not account for
- Slippage. The stop is a request, not a guarantee. In fast markets it fills worse than the level you set, so the real loss exceeds the calculated risk.
- Spread and commission. Both are paid on top of the calculated risk. On a 10 pip stop a 2 pip spread is a fifth of the trade before it starts.
- Swap. Held overnight, a position accrues financing that has nothing to do with price direction.
- Correlated positions. Three trades sized at 1% each on EUR/USD, GBP/USD and AUD/USD are not three separate 1% risks. They are closer to one 3% bet on the dollar.
Calculator questions
Do these calculators predict profit?
No. They contain no return assumptions of any kind. Each one applies a fixed formula to the numbers you type. The formula sits next to the fields, so you can check the arithmetic yourself.
What risk per trade should I enter?
That is your decision, not ours. The calculator shows the consequence. At 1% of a $10,000 account, a 30 pip stop allows 0.33 lots. At 5% it allows 1.67 lots on the same stop. The larger figure is not a better trade, it is a faster account.
Why does pip value need a conversion rate?
A pip is paid in the currency the pair is quoted in. On a USD account trading EUR/USD the quote currency is already USD, so the rate is 1. Trading USD/JPY, the pip arrives in yen and has to be converted. That is why the same 1 lot position is worth a different amount per pip.
Is required margin the same as the money I can lose?
No. Margin is the part of the balance the broker locks while the position is open. Losses are not limited to it. The position keeps moving against you until it closes or the account hits a stop-out.
The broker advertises 1:500. Should I enter 500?
Only if 1:500 applies to your account, your instrument and your position size. Leverage caps differ by regulator, by instrument and often by volume tier. The headline number is the maximum available to somebody, rarely to everybody.