I searched: position sizing calculator
You need a tool that starts from account risk and stop distance, then solves for lot size.
Back to lot size
Trading tools / Risk calculator
Position sizing calculator
Calculate trade size from the only number that should boss the chart around: planned risk. Enter balance, stop pips, pip value, and the calculator turns the play call into lots.
Core formula
Risk / Stop
Risk amount divided by stop distance and pip value gives position size.
Risk first
1%-2%
Many traders use small fixed risk per trade so one loss does not run the whole offense.
Output
Lots
The calculator returns standard lots, units, pip value, and stop-loss risk.
Risk mapSize the trade after the stop and risk are known.
Output
Lots + units + risk
One result should explain position size, pip value, stop loss, and target math.
Risk first
The trade should fit the account, not the other way around.
Position sizing calculator
Calculate forex lot size from account risk, stop-loss distance, and pip value.
Risk mode
Quick pip value presets
Suggested size0.2 lots
Risk amount$100
Loss at stop$100
Units20,000
Pip value$2.00
Mini lots2
Micro lots20
Reward plan$200 target / 2R
Break-even win rate: 33.3%
Margin estimate$723
Estimated from units x entry price / leverage. Margin is not max loss.
Position size = risk amount / (stop pips x pip value per 1.00 lot)
Result assumes pip value is entered in your account currency. For cross pairs, metals, crypto, indices, or non-USD accounts, verify pip or tick value with your broker before trading.
Formula
Size comes after risk.
The calculator is only as good as the stop-loss distance and pip value you feed it.
The clean calculation
For forex, a practical formula is position size = risk amount / (stop pips x pip value per 1.00 lot). If you risk $100, use a 50-pip stop, and one standard lot is $10 per pip, the position is $100 / (50 x $10) = 0.20 lots.
This keeps the trade grounded. You do not pick the biggest lot size the platform allows and then hope the chart respects your courage. The chart does not care about courage. It barely replies to emails.
Measure stop pips
Your stop should come from the chart level that invalidates the setup.
Choose risk amount
Pick dollars or account percentage before touching lot size.
Size the trade
Let the formula convert risk and stop distance into lots.
Intent-based answers
What you really need when you search sizing.
I searched: how to calculate lot size
You need risk amount, stop pips, and pip value per standard lot.
I searched: how much should I risk?
You need a rule small enough that normal losses do not force bad decisions.
I searched: margin vs risk
You need both numbers. Margin opens the trade; stop-loss risk tells you what is on the line.
Examples
The same stop can carry different risk.
The account size, risk rule, stop pips, and pip value decide the lot size together.
Example position sizes
These examples use a $10 pip value per 1.00 lot, common for EUR/USD-style USD quote pairs.
| Account | Risk | Stop | Pip value | Lots | Loss at stop |
|---|---|---|---|---|---|
| $5,000 | 1% | 25 pips | $10 / lot | 0.20 | $50 |
| $10,000 | 1% | 50 pips | $10 / lot | 0.20 | $100 |
| $10,000 | 2% | 40 pips | $10 / lot | 0.50 | $200 |
| $2,500 | $25 fixed | 50 pips | $10 / lot | 0.05 | $25 |
If the stop gets wider, lot size should usually get smaller. If the stop gets tighter, size can increase, but only if the tighter stop still makes sense on the chart.
Risk guardrails
Margin is not the same as risk.
Position size
This is the actual trade quantity. Bigger size means every pip has more account impact.
Planned risk
This is what you expect to lose if your stop works as planned. It should be decided before entry.
Margin
This is collateral required by the broker. It is not a promise that your loss cannot exceed that number.
Market gaps
Stops can slip in fast markets. The calculator helps plan risk; it does not remove risk.
Related terms
Five numbers before the click.
Position sizing connects the chart to the account. These terms should be clear before a trade gets opened.
Risk amountThe maximum planned loss if the stop is hit, usually dollars or account percentage.
Stop pipsThe distance between entry and stop loss measured in pips.
Pip valueThe money gained or lost per pip at a given lot size.
Position sizeThe final trade quantity, often expressed in standard lots or units.
MarginThe collateral needed to open the leveraged position, separate from planned trade risk.
Common mistakes
The math is boring. That is the point.
01
Sizing from desired profit instead of acceptable loss. That is how trades start wearing fake mustaches.
02
Using margin requirement as if it were max risk. Margin is collateral, not a stop-loss plan.
03
Changing stop distance after calculating size. If the stop moves, the size must be recalculated.
04
Using a $10 pip shortcut on every instrument. Cross pairs, JPY pairs, metals, and crypto can differ.
05
Increasing size after a loss to get even. That is not risk management; that is revenge with a login.
FAQ
Fast answers for position sizing.
Direct answers for traders and search engines, with the risk assumptions stated clearly.
How do you calculate forex position size?
Divide your risk amount by your stop-loss distance in pips and the pip value per standard lot. The result is the position size in standard lots.
What inputs do I need for a position sizing calculator?
You need account balance, risk amount or risk percentage, stop-loss distance, and pip value. Entry price and leverage are useful for estimating notional value and margin.
What is the position size formula?
A common forex formula is position size in lots = risk amount / (stop pips x pip value per 1.00 lot).
Is margin the same as risk?
No. Margin is the amount set aside to hold a leveraged position open. Risk is the amount you plan to lose if your stop is hit, though losses can exceed the plan in fast or gapping markets.
Why does pip value matter?
Pip value converts chart distance into dollars. Without pip value, a 25-pip stop does not tell you how much money is at risk.
Can I use this calculator for stocks or crypto?
The displayed formula is built for forex pip-based sizing. For stocks, futures, crypto, or indices, use the instrument's share, contract, tick, or point value instead of forex pip value.
Build the framework
Put sizing next to the chart plan.
A calculator gives the number. The full process still needs watchlist, levels, stop logic, risk limits, and review.