Forex Slippage Cost Calculator

What is Forex Slippage Cost?

Forex slippage is the difference between the price you expected when placing a currency order and the price at which it was actually filled. Slippage cost is that difference in money: (actual price − expected price) × contract size × lots. For a buy, positive cost means you paid more than expected; for a sell, you received less. Standard forex lots are typically 100,000 units of the base currency; mini and micro lots use 10,000 and 1,000 units respectively.

How to Use This Forex Slippage Cost Calculator

1. Select order side: Buy or Sell.
2. Enter expected price: The rate you had in mind when you sent the order (e.g. last quote or your limit).
3. Enter actual fill price: The rate at which the order was executed (from your broker).
4. Set contract size: Units per lot (e.g. 100,000 for standard, 10,000 for mini, 1,000 for micro).
5. Enter number of lots: Your position size in lots (e.g. 1, 0.5, 0.1).
6. Read the result: Total slippage cost, cost per unit, and slippage percentage. Positive = unfavorable; negative = favorable.

Why Forex Slippage Cost Matters

Slippage is a real execution cost in forex. It reduces profit on winning trades and increases loss on losing trades. Knowing your slippage cost helps you:

• Compare execution quality: Track slippage across brokers or ECNs to see who gives better fills on currency pairs.
• Size positions: In volatile or illiquid pairs, large lot sizes can cause large slippage; factor it into risk and position sizing.
• Set limits: Use limit orders or tiered entries to cap how much slippage you accept on each trade.

Frequently Asked Questions