Forex Position-Size Calculator — How Much to Risk Per Trade (With Examples)

Last updated: April 2026

There are two numbers every forex trader should know before they click “buy” or “sell”:

1. How much am I risking in my account currency?
2. How many lots does that mean I trade?

Most beginner losses start because one of those numbers got guessed. This page gives you a calculator that gets both right, the formula behind it, and four worked examples from real beginner account sizes.

The calculator

Enter your account balance, choose a risk percentage, pick the pair you’re trading, and type in your stop-loss distance in pips. The tool returns your position size in standard, mini, and micro lots — plus a warning if the size would fall below your broker’s minimum.

Why position sizing matters more than direction

New traders tend to obsess over the wrong question: “Will EUR/USD go up or down?” That matters less than beginners think.

The question that matters: “If I’m wrong, how much will it cost me?”

A trader who’s right 40% of the time but sizes correctly will outlast a trader who’s right 60% of the time but sizes on feelings. The math of survival is position sizing, not prediction.

A one-sentence rule fixes most of the damage: never risk more than 1% of your account on a single trade. Everything on this page is a different angle on that rule.

The math, in plain English

Position size is whatever number of units makes this equation true:

risk in account currency = stop distance in pips × pip value per unit × position size in units

Rearranged for what you actually want to know:

position size = (account balance × risk %) ÷ (stop distance × pip value per unit)

The only tricky term is pip value per unit — how much money one pip is worth for one unit of the base currency. That depends on:

• The pair you’re trading.
• Your account’s denomination currency.
• The current exchange rate (for cross-pair calculations).

On pairs where the quote currency equals your account currency (EUR/USD for a USD account), pip value per unit = 0.0001. For JPY pairs, pip value per unit = 0.01 because JPY quotes use 2 decimals, not 4.

Four worked examples

Example 1 — $500 USD account, EUR/USD, 50-pip stop

• Balance: $500
• Risk: 1% = $5
• Pip value per unit (EUR/USD for USD account): $0.0001
• Stop distance: 50 pips

Position size = $5 ÷ (50 × $0.0001) = 1,000 units = 0.01 lots = 1 micro lot

Verdict: This is the minimum trade size at most brokers. If you can’t size a trade at 1% risk without going below 0.01 lots, either widen your stop, grow your balance, or (gently) lower your risk target to 0.5%.

Example 2 — $2,000 USD account, GBP/USD, 30-pip stop

• Balance: $2,000
• Risk: 1% = $20
• Pip value per unit: $0.0001
• Stop distance: 30 pips

Position size = $20 ÷ (30 × $0.0001) = ~6,667 units = 0.067 lots ≈ 6 micro lots

Verdict: Round down, not up. Trading 0.06 lots on GBP/USD risks about $18 — safely under the 1% target.

Example 3 — $1,000 EUR account, USD/JPY, 40-pip stop

• Balance: €1,000
• Risk: 1% = €10
• Pip value per unit (USD/JPY): $0.01 ÷ current USD/JPY rate. Assume current rate = 152.00. Pip value per unit in JPY = ¥0.01. Convert to EUR: €10 ÷ current EUR/JPY rate. Assume EUR/JPY = 164.00. Pip value per unit in EUR ≈ €0.0000610.
• Stop distance: 40 pips

Position size = €10 ÷ (40 × €0.0000610) ≈ 4,098 units ≈ 0.041 lots ≈ 4 micro lots

Verdict: Cross-currency calculations are where people slip up. Use the calculator — don’t do JPY math by hand during a trading session.

Example 4 — $10,000 USD account, XAU/USD (gold), 100-pip stop

• Balance: $10,000
• Risk: 1% = $100
• Pip value per ounce on XAU/USD: $0.01 (gold quotes to 2 decimals in most platforms, though some quote to 3 — check yours)
• Stop distance: 100 pips ($1.00)

Position size = $100 ÷ (100 × $0.01) = 100 units = 1.00 lot (on most broker contract specs — but gold contract sizes vary, always check)

Verdict: Gold is worth revisiting contract specs for, because different brokers size their gold contracts differently. Always confirm before sizing.

What to do when the calculator says your trade is too small

If the calculator returns a size below your broker’s minimum (usually 0.01 lots), you have four honest responses:

1. Widen your stop — only if the wider stop reflects a better technical level, not just a need to fit a bigger position.
2. Reduce your risk target — 0.5% is a reasonable floor for a learning account.
3. Add to your balance — only if you’ve already mentally written off the additional funds.
4. Skip the trade — there’s no obligation to trade every setup. Sometimes “too small” is the market telling you the setup’s not right for your account yet.

Do not respond by ignoring the calculator and sizing up to “make it feel worth it”. That’s the path every blown account took.

What to do when the calculator says your trade is big

If the calculator returns a size that feels large (e.g. 5+ mini lots on a $5,000 account), pause and check:

• Is your stop too tight? A short stop forces position size up to hit the same risk amount.
• Did you enter the right stop distance? It’s easy to type pips when you meant points.
• Is your broker’s minimum spread narrow enough that a tight stop is realistic, or will you be stopped out by normal spread widening?

The calculator is honest. But it only knows what you tell it. Double-check your inputs on any trade where the recommended size surprises you.

How much should you risk per trade? Not 2%. Probably not even 1%.

The conventional advice is 1–2% risk per trade. In practice, for a new trader:

• Demo phase: Risk 1% to simulate real sizing.
• First 30 days live: 0.5%. You’re learning how live execution feels — not trying to make the journal profitable.
• Days 30–90 live: 1% once rule-violation count trends down.
• Post-90 days: 1% remains a sensible ceiling for your first year. Moving to 2% should be earned, not elected.

Risk scaling is the reverse of what most beginners assume. The answer to “how do I make more” is not “risk more per trade”. It’s “trade more often, better setups, same 1%”.

Position sizing and correlation

One subtle trap: two positions can look independent and actually be the same trade.

If you’re long EUR/USD and long GBP/USD at the same time, you’re effectively double-long the dollar’s weakness. Both positions will move together on a USD-wide event (e.g. FOMC). If you’ve sized each at 1% risk, your combined risk is closer to ~1.7% (correlation-adjusted), not 2%.

For a beginner, the fix is simple: one open position at a time, at least for the first 90 days. When you do start running multiple positions, keep correlated pairs on the same side of your book as a single position for sizing purposes.

FAQ

Do I need a position-size calculator if I’m only trading small? Yes. Small accounts are the accounts most likely to be ruined by one over-sized trade. Use the calculator every time.

What’s the difference between pip value and tick value? On most forex pairs they’re identical (one tick = one pip). On some instruments (indices, commodities), they differ. Check the contract spec for the instrument in your platform.

How do I factor in commission? For a rough estimate, add the round-trip commission to your stop distance calculation. If you’re trading EUR/USD with a 30-pip stop and $7 round-trip commission per standard lot, treat the effective stop as slightly wider. For most retail-spread accounts, commission is already inside the spread — no adjustment needed.

Does the calculator work for indices, commodities, and crypto CFDs? The math is the same; pip/point value differs. Use the contract-spec-aware mode in the calculator (or use a dedicated instrument calculator) for anything that isn’t a standard forex pair.

Should I use fixed-risk or fixed-fractional sizing? Fixed-fractional (1% of current balance) is standard for retail. It scales you down after losses — exactly when you need to slow down — and scales you up after wins.

What if my broker’s minimum lot is 0.01 but I want to trade less? Some brokers offer “cent accounts” or “nano lots” (0.001). Most don’t. If the math says your trade is smaller than your broker allows, that’s your broker telling you your account isn’t right-sized for the trade. Widen the stop, lower the risk, or skip.

Related reading

• The Complete Beginner’s Guide to Forex Trading in 2026 — everything the calculator assumes you already know.
• OrderGlo account types and minimums — see which tier supports micro-lot trading.

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Trading forex and CFDs is risky and not suitable for everyone. Between 70% and 80% of retail investor accounts lose money when trading these instruments. Please consider the risks carefully before trading.