TRADING
Swap Calculator — Forex Overnight Costs
By Worldtickers ·
Use our free swap calculator to compute overnight swap and rollover costs for holding forex and CFD positions. Enter your currency pair, position size, and swap rate to see the daily and total financing cost.
This swap calculator — forex overnight costs tool focuses on use our free swap calculator to compute overnight swap and rollover costs for holding forex and CFD positions. Enter your currency pair, position size, and swap rate to see the daily and total financing cost. Use it to size trades, compare risk levels, estimate market exposure, and review entries, exits, volatility, leverage, and stop levels before committing capital.
Swap Calculator
Swap Calculator
Calculate overnight swap/rollover costs for leveraged positions.
What Is a Swap?
In forex trading, a swap — also known as rollover or overnight financing — is the interest adjustment applied to your account when you hold a position past the daily market close. Unlike stocks, where settlement typically occurs on a T+1 basis, forex trades settle on T+2 (two business days). When you hold a position overnight, the original settlement date passes, and the position must be "rolled" to a new settlement date. This rollover involves closing and reopening the position at the current forward rate, which incorporates the interest rate differential between the two currencies. The net interest earned or paid is the swap.
The swap mechanism is how carry trades generate income. When you are long a high-interest currency and short a low-interest currency, the swap credit you receive each night represents the interest rate differential between the two currencies. Conversely, when you are in the opposite position — long the low-interest currency and short the high-interest one — you pay the differential as a swap debit. The swap rate is not fixed; it fluctuates daily based on interbank lending rates, which are themselves derived from central bank policy rates. A rate hike by the Reserve Bank of Australia, for example, would immediately increase the swap credit for AUD/JPY long positions.
Understanding swaps is essential for any trader who holds positions overnight. A seemingly profitable trade can become unprofitable if the cumulative swap costs exceed the capital gain. Conversely, a position that moves against you slightly can still be profitable if the swap income is large enough to offset the loss. Swaps are particularly important for swing traders and position traders who hold trades for days, weeks, or months — over these timeframes, swap costs can represent a significant portion of the total trade P&L. The calculator above helps you quantify these overnight financing costs before you commit to a position.
How to Use This Calculator
This swap calculator computes the daily and cumulative overnight financing cost for a forex or CFD position based on the swap rate, position size, and holding period.
Swap Rate
Enter the swap rate for your position, which you can find in your broker's contract specifications. The swap rate is typically expressed in points per standard lot per day. It can be positive (you earn) or negative (you pay). Check both the long swap and short swap rates, as they differ for each direction of the trade.
Position Size
Enter the number of standard lots you are holding. One standard lot in forex is 100,000 units of the base currency. The calculator multiplies the per-lot swap rate by your position size to show the total daily swap cost or income.
Holding Period
Enter the number of nights you expect to hold the position. The calculator multiplies the daily swap by the number of nights to show the total swap cost. Note that triple swap Wednesday adds an extra two days of swap if your holding period crosses a Wednesday night.
Reading the Output
The calculator shows the daily swap cost or income, the total swap for your holding period, and the annualized swap return as a percentage of the position value. Use the annualized figure to compare the swap income across different pairs and to assess whether the swap income adequately compensates for the exchange rate risk you are taking.
The Formula Explained
The daily swap formula is: Daily Swap = Swap Rate × Position Size (lots) × Point Value.
For a standard lot of EUR/USD with a point value of $10 and a swap long rate of -0.5 points, the daily swap is: -0.5 × 1 × $10 = -$5.00. This means you pay $5.00 per night for holding a 1-lot long EUR/USD position. For a positive swap, the calculation is identical but yields a credit to your account.
The total swap for a holding period is: Total Swap = Daily Swap × Nights Held + Extra Wednesday Charges. If your holding period includes a Wednesday night, add two extra days of swap (triple swap). For example, holding a position for 5 nights that includes one Wednesday night means 5 + 2 = 7 days of swap are applied. The annualized swap return is: Annualized Swap % = (Total Swap / Position Value) × (365 / Nights Held).
Real-World Examples
Example 1: Earning Positive Swap on AUD/JPY
You buy 1 standard lot of AUD/JPY with a swap long rate of +15 points per day. The point value for JPY pairs is approximately $0.67 per point per standard lot. Daily swap income: 15 × 1 × $0.67 = $10.05. Holding for 20 nights, the total swap income is $201. If AUD/JPY rises 2% over the period, your total return includes both the capital gain and the $201 swap income — a meaningful addition to the trade P&L.
Example 2: Paying Negative Swap on USD/JPY Long
You buy 2 standard lots of USD/JPY with a swap short rate of -4.5 points per day. The daily swap cost is: -4.5 × 2 × $0.67 = -$6.03 per night. Holding for 10 nights costs $60.30 in swap charges. If the trade profits $80 on the exchange rate move, your net profit after swap costs is only $19.70 — the swap ate up more than 75% of the gross profit. This illustrates why swap costs must be factored into trade planning for positions held overnight.
Example 3: Triple Swap Impact
You hold a 3-lot position with a daily swap of -$8 per lot through Wednesday night. Without triple swap, the 5-night cost would be: 3 × $8 × 5 = $120. With triple swap on Wednesday, the effective nights charged are 7: 3 × $8 × 7 = $168. The extra $48 represents the weekend financing cost. For traders holding large positions through the week, the triple swap on Wednesday is a material cost that should be planned for.
Tips and Limitations
Close Before Wednesday Cutoff If Possible
Triple swap Wednesday is the single most avoidable swap cost. If your strategy does not require holding through the weekend, closing positions before the Wednesday 5 PM ET cutoff and reopening on Thursday saves two days of swap. For positions with small capital gains, the triple swap can be the difference between a profitable and unprofitable trade. Check your broker's exact cutoff time, as some brokers adjust the rollover window.
Compare Swap Rates Across Brokers
Brokers apply different markups to the interbank swap rates, so the same position can have different swap costs at different brokers. For carry traders holding positions for weeks or months, a 1–2 point difference in the swap rate can translate to hundreds or thousands of dollars annually. Before committing to a carry strategy, compare the actual swap rates offered by several brokers for the specific pairs you trade.
Factor Swings into Trade Planning
Before entering any overnight position, calculate the swap cost and include it in your trade plan. A trade targeting $200 in profit with a $50 swap cost has an effective profit target of $150 after financing. If the swap is negative and the trade moves against you, the swap adds to the loss. Always compute the break-even exchange rate movement including the swap cost — this gives you a more realistic picture of the trade's risk-reward profile.
Watch for Rate Changes
Swap rates change whenever central banks adjust policy rates. A position with a small negative swap can become a large negative swap if the central bank of the currency you are long raises rates. Conversely, a rate cut can turn a negative swap positive. Monitor central bank calendars and be prepared to adjust positions when major rate decisions are announced.
Frequently Asked Questions
What is a swap in forex trading?
A swap (also called rollover or overnight financing) is the interest earned or paid when you hold a forex position overnight. When you hold a position past the broker's cutoff time (typically 5 PM ET), the position is rolled to the next settlement date, and an interest adjustment is applied to your account. If you are long a high-interest currency and short a low-interest currency, you earn the interest differential (positive swap). If you are in the opposite position, you pay the differential (negative swap). The swap rate is determined by the interbank interest rates for each currency, plus or minus the broker's markup.
What is triple swap Wednesday?
Triple swap Wednesday refers to the fact that positions held open on Wednesday night are charged or credited three days of swap instead of one. This is because the standard settlement cycle for forex trades is T+2 (two business days). A position opened on Wednesday and held past the cutoff settles on Friday, but the settlement date is pushed to Monday due to the weekend. To account for the Saturday and Sunday holding costs (even though the market is closed), brokers apply three days of swap on Wednesday night. This makes Wednesday the most expensive night to hold a position open, and many short-term traders close positions before the Wednesday cutoff.
How do brokers calculate swap rates?
Brokers base swap rates on the interbank lending rates for each currency in the pair, which are derived from the overnight index swap (OIS) rates or the central bank policy rates. The swap for a long position in EUR/USD is based on the EUR overnight rate minus the USD overnight rate, adjusted for the broker's credit spread and profit margin. Brokers typically add a markup of 1–3 basis points to the interbank rate, so the retail swap rate is slightly less favorable than the institutional rate. Swap rates change whenever central banks adjust their policy rates, so they are not fixed — they can vary from day to day.
Does every currency pair have a swap cost?
No — some pairs have zero or near-zero swap costs when the interest rates of the two currencies are very close. For example, EUR/USD and USD/JPY often have small swap rates because the rate differentials are modest. Pairs with large rate differentials — like AUD/JPY, NZD/JPY, or emerging market crosses — have significant positive or negative swaps. Some brokers offer Islamic (swap-free) accounts that eliminate swap charges entirely, though these accounts may have other fee structures to compensate.
How does the swap affect long-term vs short-term traders?
For short-term traders (day traders and scalpers who close positions before the daily cutoff), swaps are irrelevant because no positions are held overnight. For swing traders who hold positions for several days to weeks, swaps become a meaningful factor — positive swaps add to profits and negative swaps erode them. For long-term position traders and carry traders, swaps are a primary component of the total return. A swing trader holding a positive-swap position for 10 days earns 10 days of carry; a trader holding a negative-swap position for the same period pays 10 days of financing.
Can swap rates change while I have an open position?
Yes. Swap rates are recalculated daily based on current interbank rates, so the swap you earn or pay on Monday may be different from the swap on Tuesday. Central bank rate changes cause immediate shifts in swap rates — if the Federal Reserve raises rates, all USD-denominated swap rates increase the same day. Your open position is charged or credited at whatever the current swap rate is each night, not at the rate that existed when you opened the position. This means a position with a small positive swap could become negative if the interest rate differential narrows.
How do I find the swap rate for a specific pair?
Your broker's trading platform displays the swap long and swap short rates for every instrument — usually in the contract specifications or symbol information panel. The rate is typically expressed in points per lot per day. To convert to a dollar amount: Swap Cost = Swap Points × Point Value × Number of Lots. For example, if the swap long for EUR/USD is -0.5 points and the point value for a standard lot is $10, the daily swap cost for a 1-lot long position is -$5.00. The swap calculator above automates this calculation for you.
What is the relationship between swaps and interest rate parity?
Interest rate parity (IRP) theory states that the forward exchange rate between two currencies should reflect the interest rate differential. In a perfect IRP world, the swap rate would exactly offset the interest differential, making carry trades risk-free and zero-profit. In practice, IRP does not hold perfectly due to capital controls, supply-demand imbalances, risk premiums, and market segmentation. The deviation from IRP is what creates the carry trade opportunity and why swap rates, while closely related to interest differentials, are not a perfect offset.