The Forex Calculator helps traders compute pip value, lot size, and margin for various currency pairs.
Three modes: calculate pip value to determine profit/loss per pip, calculate lot size based on risk management (% of balance), and calculate required margin based on leverage. Supports major and cross pairs.
Disclaimer: Forex trading carries high risk. This calculator is for education and planning, not a trading recommendation.
Calculator information
📋 How to use this calculator
- Pick the calculator mode: Pip Value, Lot Size (position sizing by risk), or Margin (required collateral).
- Choose a currency pair, for example EUR/USD, GBP/JPY, or XAU/USD for gold.
- For Pip Value: enter the position size in lots (1 standard lot = 100,000 units of base currency).
- For Lot Size: enter your account balance (USD), risk percentage (1-2% is the standard), and stop loss in pips.
- For Margin: enter the leverage (e.g., 1:50 - the maximum allowed for US retail majors) and position size.
- Click Calculate to see the result. Tip: never risk more than 2% of your balance per position, in line with Van Tharp's position-sizing principles.
🧮 Pip Value, Position Size, and Margin
Pip Value = (Pip Decimal / Exchange Rate) * Lot Size; Position Size = (Balance * Risk%) / (Stop Loss Pips * Pip Value); Margin = (Lot Size * Contract Size) / Leverage
- Pip Decimal = 0.0001 for 4-decimal pairs, 0.01 for JPY pairs
- Exchange Rate = current price of the pair
- Lot Size = 100,000 (standard), 10,000 (mini), 1,000 (micro) units
- Risk% = percentage of balance risked per trade (typically 1-2%)
- Leverage = ratio of borrowed to own capital (e.g., 1:50)
When USD is the quote currency, pip value equals pip decimal * lot size directly without further conversion.
💡 Worked example: EUR/USD trade with a $5,000 account, 1% risk, 30-pip stop loss
Given:- Balance = $5,000
- Risk = 1% = $50
- Stop Loss = 30 pips
- Pair = EUR/USD; pip value per standard lot = $10
Steps:- Maximum loss = $5,000 * 1% = $50
- Pip value per micro lot (0.01) = $0.10
- Loss per micro lot = $0.10 * 30 = $3
- Position size = $50 / $3 = 16.67 micro lots = 0.17 standard lots
Result: Open a position no larger than 0.17 lots so a stop-loss hit does not exceed 1% of the account ($50).
❓ Frequently asked questions
Is retail forex trading legal in the US?
Yes, but it is tightly regulated. Retail forex brokers must register with the CFTC (Commodity Futures Trading Commission) and be members of the NFA (National Futures Association). Only a handful of brokers (e.g., OANDA, FOREX.com, IG US) are authorized to serve US retail clients. Trading with unregistered offshore brokers is illegal and offers no US legal protection. Verify any broker via NFA BASIC (https://www.nfa.futures.org/basicnet/).
How is forex profit taxed in the US?
By default, forex spot trading falls under IRC Section 988 (ordinary income at marginal rates up to 37%). Traders can elect Section 1256 treatment for certain currency contracts (60% long-term / 40% short-term capital gains, max blended ~26.8%), but the election must be made before any trades and applies to qualifying contracts only. Consult a CPA familiar with trader tax status - the Section 988 vs 1256 choice materially affects your bill.
What is the difference between 1:50 and 1:500 leverage?
Leverage is the ratio of borrowed capital to your own. 1:50 means $100 of margin controls $5,000 of position; 1:500 means $100 controls $50,000. The CFTC caps US retail forex leverage at 1:50 for major pairs and 1:20 for minors and exotics (CFTC Reg 5.9). Offshore brokers offering higher leverage are not legal for US residents. Higher leverage magnifies both gains and losses proportionally.
Why are pips different on JPY pairs?
JPY pairs (USD/JPY, EUR/JPY, GBP/JPY) quote to only 2 decimal places because the yen has a low per-unit value. One pip = 0.01, not 0.0001 as for other pairs. For example, USD/JPY moving from 149.50 to 149.55 is a 5-pip move. Many brokers also show fractional pips (pipettes) at a 3rd decimal for more precise execution.
What are margin calls and stop outs?
A margin call is your broker's warning that account equity is approaching the minimum required margin level (typically 100%), prompting you to add funds or close positions. A stop out is the broker's forced liquidation of positions once margin level falls to a defined threshold (typically 50%) to prevent the account going negative. NFA-regulated US brokers are required to offer negative balance protection for retail forex accounts.
📚 Sources & references
Last updated: May 11, 2026