Forex Slippage Calculator
This Forex Slippage Calculator compares an entered expected price with an actual execution price. It applies the selected buy or sell direction, converts the signed difference into pips and account-currency impact, and keeps spread, commission, latency and broker-quality conclusions outside the result.
Enter one completed transaction
Use the side of the executed order itself. For a buy, a higher fill is adverse; for a sell, a lower fill is adverse.
Select the currency of the entered pip value.
Choose the transaction side, not a strategy label.
Use one recorded reference price for this fill.
Use the completed transaction’s actual fill price.
For many non-JPY FX pairs one pip is 0.0001; verify the symbol specification.
Enter the volume represented by this fill.
Enter the account-currency value of one pip for one lot at this fill context.
Observed fill difference
Entered Trade Diagnostics 1.0.0.
| Transaction | Expected price | Execution price | Signed price difference | Signed pips | Signed money |
|---|
How forex slippage is calculated
Sell adverse difference = Expected price − Execution price
Signed pips = Adverse difference ÷ Pip size
Signed money = Signed pips × Pip value per lot × Lots
The sign is direction-aware. Positive output is adverse to the entered transaction side, negative output is favourable price improvement, and zero means the two entered prices are equal. Text accompanies the sign so color is never the only explanation.
The calculation measures one fill only. It does not decide why the price changed or whether the broker met an execution obligation. MetaTrader execution mode, order type, market conditions, quote timing and partial fills can all affect the evidence required for a broader review.
Worked example from the audited fixture
The audited example is a 0.5-lot buy requested at 1.08500 and filled at 1.08520, using a 0.0001 pip size and USD 10 pip value per lot.
- Buy adverse price difference = 1.08520 − 1.08500 = 0.00020. Slippage = 0.00020 ÷ 0.0001 = +2 pips.
- Signed monetary impact = 2 pips × USD 10 × 0.5 lot = +USD 10 adverse to the entered buy transaction.
Reproduce it: select “Load audited example” above to use the immutable Batch 33 reference values.
How to interpret the result
- A positive number means the entered execution price was worse than the entered reference for that transaction side.
- A negative number means favourable price improvement; the arithmetic should still be checked against the original order and execution record.
- The amount is not total trading cost. Add spread, commission, financing and other charges separately where relevant.
Assumptions and limits
- The user supplies both the reference and execution prices.
- One pip size and one account-currency pip value per lot apply to the whole fill.
- Partial fills, volume-weighted fills, spread, commission, taxes, financing and latency are excluded.
- The page does not determine whether an order should have filled at another price.
- No broker comparison, execution-quality grade, future cost projection or trading recommendation is produced.
Effective leverage vs slippage vs MAE/MFE
These tools share a manual, privacy-safe diagnostic layout but answer different questions. Keep the account snapshot, execution record and observed trade path separate so one value is not silently used as evidence for another.
| Measure | Evidence unit | Calculation | Main boundary |
|---|---|---|---|
| Effective leverage | Account snapshot | Gross notional ÷ equity | Does not calculate broker margin. |
| Fill slippage | One completed transaction | Expected price vs execution price | Does not include total trading costs. |
| MAE/MFE | One observed trade range | Entry vs intratrade low and high | Does not reconstruct path order or recommend levels. |
Frequently asked questions
- This page uses slippage to mean the difference between the user-entered expected or requested price and the actual execution price.
- A higher buy fill or lower sell fill is positive adverse slippage; the opposite is negative favourable price improvement.
- The direction-aware signed price difference is divided by the entered instrument pip size.
- Signed slippage pips are multiplied by the entered account-currency pip value per lot and the executed volume in lots.
- A negative value means the actual fill improved on the entered reference price for that transaction side.
- No. Version 1.0.0 isolates the expected-versus-executed price difference and excludes spread, commission, financing, taxes and other costs.
- No. A broader execution review needs order type, quote timing, execution mode, partial fills, market conditions and the applicable broker or regulatory evidence.
- You may enter any documented reference, but chart, bid, ask, requested, stop and regulatory arrival prices can differ, so state and preserve the source you used.
Sources and methodology
- MetaTrader 5 Help — Executing Trades — Official explanation of specified price, execution price and permitted deviation.
- Investor.gov — Executing an Order — Official explanation that displayed or quoted prices may differ from the eventual execution price.
Complete the execution-cost review
Compare the account and execution records behind your inputs
Before interpreting entered exposure, fills or trade-path extremes, confirm that contract specifications, account currency, volume, price records and cost conventions match the broker statement or platform history you used.
Risk and affiliate disclosure: Leveraged forex and CFD trading can result in substantial losses. These are affiliate links, so ForexMT4Indicators.com may receive compensation if you register or trade through them, at no additional cost to you. Availability and terms vary by jurisdiction and broker entity.