Forex Risk

Forex Max Lot Size Calculator

Trade right up to what's left of your risk budget without going over it. Enter the amount you have left before you hit your own daily or weekly loss limit and your stop, and get the largest lot size that keeps a single trade inside it.

Risk budget remaining $5,000

Cash left before you hit your daily, weekly, or per-account loss limit.

Risk fraction of budget 50%

How much of that remaining budget to risk on one trade.

Stop-loss (pips) 20 pips

Distance from entry to your stop, measured in pips.

Pip value / standard lot $10.00

Value of one pip per standard lot ($10 for most USD-quoted pairs).

Max Position Size 12.50 lots

Risking $2,500.00 on a 20-pip stop, the largest trade that stays inside your budget is 12.50 standard lots.

Risk used$2,500.00

Units1,250,000

Mini lots125.00

For educational purposes only. Read our risk warning before trading.

The Math

How the Max Lot Size Is Calculated

Start from the cash you can afford to lose: your remaining risk budget times the fraction of it you'll risk on this trade. Divide that by the cost of your stop — the stop distance in pips multiplied by the pip value of one standard lot — and you get the largest lot size that keeps the loss inside your budget.

Max Lots = (Budget × Fraction%) ÷ (Stop-Loss pips × Pip Value per Lot) Example: ($5,000 × 50%) ÷ (20 × $10) = $2,500 ÷ $200 = 12.50 lots (1,250,000 units)

Quick Reference

Sizing to Your Risk Budget

Concept	What it means
Size to your budget	Risk a fraction of what's left of your loss limit, not your full account balance — that remaining budget is what actually stops you out.
Wider stop	A wider stop costs more per lot, so the same budget buys you a smaller maximum lot size.
Keep a buffer	Never risk 100% of your budget on one trade — one stop-out at the limit ends the session with no margin for error.

Frequently Asked Questions

What counts as my risk budget?

Whatever loss limit you actually trade against — a personal daily or weekly stop, the cushion left on a prop firm's drawdown rule, or simply the amount you have decided you can afford to lose this session. The cash left before that limit is the real cap on how much a single trade can cost you, and this tool sizes your position so that even a full stop-out stays inside it.

Should I risk my whole budget on one trade?

No. Risking 100% of what's left on one trade means a single loss ends the session. Most traders risk a small fraction so a losing run still leaves room to recover. Keep the fraction conservative and treat the figure here as the absolute ceiling, not a target.

What is pip value per lot?

It is the cash a one-pip move is worth on a single standard lot. For most USD-quoted pairs like EUR/USD that's about $10. JPY and cross pairs differ, so check your broker's contract specs and enter that exact figure for an accurate lot size.

Does this work for any forex account?

Yes — it works for a personal account or a prop firm's funded account alike, because you enter your own remaining budget. If you trade under a firm's rules, find the smaller of the daily and overall drawdown cushions first and enter that as your budget; for a personal account, enter whatever loss limit you actually hold yourself to.

Remaining risk budget

Max Lot Size Calculator for What Is Left of Your Risk Budget

This max lot size calculator answers one question before you place the order: how big can this trade be without pushing you past your own loss limit? You enter the cash you have left before you hit a daily or weekly loss limit, the fraction of it you will risk, your stop in pips and the pip value per lot, and it returns the largest lot size that keeps a single stop-out inside that risk budget. The default starts from a $5,000 remaining budget. It is free, runs in your browser, and the figure it gives is a ceiling, not a target.

A 4h EUR/USD chart labeled Loss limit left opening into a 15m pane labeled This trade, illustrating a max lot size sized inside a remaining risk budget.

A EUR/USD 1h risk ladder showing entry, stop-loss and two take-profit rungs drawn to scale, with a note that stop cost is pips times pip value per lot.

The max lot formula

Budget, Fraction and Stop Cost Behind Your Max Lot Size

The math takes three steps you can check by hand. Multiply your remaining risk budget by the fraction you will risk on this trade to get the cash at stake. Work out the stop cost: the stop distance in pips times the pip value of one standard lot. Divide the first number by the second and the result is your max lot size, written as Max Lots = (Budget × Fraction%) ÷ (Stop-Loss pips × pip value per lot). On most USD-quoted pairs such as EUR/USD, one standard lot is worth about $10 a pip, while JPY and cross pairs differ, so enter your broker's exact figure.

What to enter

Risk Budget From a Daily Limit or Prop Firm Drawdown

Your risk budget is whatever loss limit you actually trade against, and you enter it yourself. On a personal account it is the cash left before your own daily or weekly stop. On a prop firm's funded account it is the cushion left on the drawdown rule: find the smaller of the daily and overall drawdown cushions first, and enter that. If you set no formal limit, use the amount you have decided you can afford to lose this session. Then add your stop in pips and the pip value per lot from your broker's contract specs, since JPY and cross pairs differ from the usual figure.

Three tiles naming the sources of a risk budget: a personal daily or weekly limit, a prop firm's smaller drawdown cushion, and an affordable session allowance.

A two-column comparison contrasting sizing from a remaining risk budget against sizing from the full account balance, across three rows.

Budget, not balance

Why Max Lot Uses Your Remaining Budget, Not Your Balance

Sizing from your full account balance ignores the number that actually stops you out. If you have $5,000 left before your daily limit, that remaining budget is the real ceiling, and every losing trade makes it smaller. This calculator sizes each trade from a fraction of what is left, so a stop-out lands inside the limit instead of past it. Most traders risk a small fraction so a losing run still leaves room to recover. Never risk 100% of the budget on one trade, because a single loss would end the session, and remember that trading always carries risk of loss.

Keep a buffer

Keep a Buffer Under Daily, Weekly and Overall Loss Limits

A max lot figure is a ceiling, not the size you have to take. Line up every limit you trade under, daily, weekly and overall, and size from whichever cushion is smallest right now, because that is the one a stop-out would breach first. Risk only a fraction of it, and keep that fraction conservative. Check the stop as well: a wider stop costs more per lot, so the same budget buys a smaller maximum lot size. The calculator works for a personal or a funded account alike, and once the number fits every limit, place the order in your platform knowing trading carries risk of loss.

Three stacked EUR/USD rungs, a daily limit on 1h, a weekly limit on 4h and overall drawdown on the daily chart, each with its remaining cushion.

Related Tools

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Risk of Ruin Estimate the odds of blowing your account from win rate, reward-to-risk ratio, and risk per trade. Open calculator Position Size Get the exact lot size that risks a fixed amount on any stop-loss distance. Open calculator Pip Value Calculate what one pip is worth for any lot size and currency pair. Open calculator Margin & Leverage Find the margin a position ties up at any leverage and lot size. Open calculator

Put These Numbers to Work

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