Forex Swap Calculator
The Forex Swap Calculator computes the daily and total swap (rollover) cost of holding a position overnight. It uses Daily Swap = Swap Points × Pip Size × Position Units, then sums across your holding period, tripling Wednesday's swap for T+2 weekend settlement. It also shows carry direction, annualized swap %, and swap-free account savings.
- Core formula: Daily Swap = Swap Points × Pip Size × Position Units, where Units = lots × contract size (100,000 units per standard lot; a mini lot is 0.1× and a micro lot is 0.01×, giving 10,000 and 1,000 units); the result is in the quote currency and converted to your account currency by dividing by the exchange rate when needed.
- Wednesday rollover (open-day cycle) is charged at 3× (triple swap) to cover Saturday and Sunday under T+2 settlement; the tool counts how many triple-swap days fall inside your 1–365 day hold.
- Positive swap points earn carry (you receive interest); negative points mean you pay. The tool labels the trade Positive Carry, Negative Carry, or Zero Swap and also shows what the opposite direction would cost or earn.
- Annualized swap % = Daily Swap × 365 ÷ position value × 100; the calculator flags a warning above 5% of position value and a stronger alert above 10% for negative carry.
- Enter your broker's exact Swap Long and Swap Short points from MT4/MT5 Symbol Specification, since brokers add a markup; the swap-free comparison shows the cost you would avoid (or positive carry you would forfeit).
Calculate daily and total swap (rollover) costs for any position. See triple swap Wednesday impact and carry trade direction.
How to Use the Swap Calculator
- Select your currency pair and position direction (Long or Short).
- Enter your position size in lots and select the lot type.
- Enter your broker's swap rates for both long and short positions. Find these in MT4/MT5 under Symbol Specification, or on your broker's website.
- Set the holding period and which day of the week you open the trade — this determines how many triple swap Wednesdays fall within your hold.
- Select your account currency and enter the exchange rate if needed.
- Click Calculate Swap to see daily costs, total swap, carry direction, and a full daily breakdown.
What Is Forex Swap (Rollover)?
When you hold a forex position overnight, your broker charges or credits you a small amount called swap (also known as rollover). This reflects the interest rate differential between the two currencies in the pair.
Every currency has an associated central bank interest rate. When you buy a pair, you are effectively borrowing the quote currency (paying its interest rate) to buy the base currency (earning its interest rate). The net difference determines whether you pay or receive swap.
For example, if AUD has a 4.35% rate and JPY has a 0.10% rate, buying AUD/JPY means you earn approximately 4.25% annually on the position (minus your broker's markup). Selling AUD/JPY means you pay that differential.
T+2 Settlement and Triple Swap Wednesday
Forex transactions settle on a T+2 basis — meaning the actual exchange of currencies happens two business days after the trade date. This settlement convention creates the famous "triple swap Wednesday."
Here's how it works:
- Monday night rollover: settles Wednesday → 1 day of swap
- Tuesday night rollover: settles Thursday → 1 day of swap
- Wednesday night rollover: settles Friday, but next settlement is Monday (skipping Sat + Sun) → 3 days of swap
- Thursday night rollover: settles Monday → 1 day of swap
- Friday night rollover: settles Tuesday → 1 day of swap
This means holding through Wednesday night costs (or earns) three times the normal daily swap. For traders with large positions or high swap rates, this can be significant.
Positive vs Negative Swap (Carry Trades)
Positive carry means you earn money for holding the position. This happens when you buy the higher-yielding currency against the lower-yielding one. Carry traders specifically seek these pairs for the steady income stream.
Negative carry means you pay for holding. Most retail trades on popular pairs like EUR/USD carry a small negative swap in both directions (because the broker keeps a spread on the interbank rate).
The carry trade strategy can be profitable in stable markets, but carries risk — if the high-yield currency depreciates more than the swap income, you lose money overall. The 2008 financial crisis saw many carry trades unwind violently as risk appetite collapsed.
How Brokers Calculate Swap Rates
Brokers derive swap rates from interbank overnight lending rates (like SOFR, EONIA, or TONA), then add their own markup. The calculation involves:
- Base interest rate differential — the gap between the two currencies' benchmark rates
- Broker markup — typically 0.5–2% added to the cost side
- Liquidity considerations — exotic pairs have wider swap spreads
- Market conditions — rates can shift significantly during central bank decision periods
This is why you'll often see both long and short swaps as negative on many pairs — the broker's markup exceeds the rate differential on at least one side.
Swap-Free (Islamic) Accounts Explained
Islamic finance principles (Sharia law) prohibit riba — the payment or receipt of interest. Since forex swap is fundamentally an interest charge, swap-free accounts were created to allow Muslim traders to participate in forex markets.
However, swap-free doesn't mean cost-free. Brokers compensate through:
- Administration fees — a flat daily charge per lot (often similar to the swap amount)
- Wider spreads — the cost is built into entry/exit prices
- Holding time limits — some brokers limit how long positions can be held
- Fewer available instruments — not all pairs may be offered swap-free
Some non-Muslim traders also use swap-free accounts to avoid negative carry on long-term positions. Check your broker's terms — some restrict swap-free accounts to qualifying clients only.
Best Pairs for Carry Trading
The best carry trade pairs have the widest interest rate differentials. Historically popular pairs include:
- AUD/JPY — Australian Dollar (higher rate) vs Japanese Yen (near-zero rate)
- NZD/JPY — New Zealand Dollar vs Japanese Yen
- USD/TRY — US Dollar vs Turkish Lira (very high Turkish rates, but extreme volatility risk)
- USD/MXN — US Dollar vs Mexican Peso
- EUR/TRY — Euro vs Turkish Lira
Important: high interest rate differentials often come with high volatility. Exotic pairs like USD/TRY can move 5–10% in a month, easily wiping out a year of carry income in a single move. Always size positions conservatively for carry trades.
Swap as a Hidden Cost in Long-Term Positions
Day traders rarely worry about swap since they close positions before rollover. But for swing traders and position traders, swap can silently erode profits:
- A typical negative swap on EUR/USD is -7 to -10 points per lot per day
- On a standard lot, that's roughly $7–$10 per day, or $2,500–$3,600 per year
- On a $100,000 position, that's a 2.5–3.6% annual drag on returns
- Triple swap Wednesdays add 2 extra days per week — 52 extra days per year
Always calculate total swap cost before entering long-term trades. A position that looks profitable on the chart may be unprofitable after swap costs are factored in.
Frequently Asked Questions
Forex swap is the interest difference between the two currencies in a pair, charged or credited when you hold a position overnight past the daily rollover time (typically 5 PM EST). If you buy a currency with a higher interest rate than the one you sell, you earn positive swap. If the bought currency has a lower rate, you pay negative swap.
Daily Swap = Swap Rate (in points) x Pip Value x Lot Size. The swap rate is set by your broker and typically quoted in points (equivalent to pips). Multiply by your position size to get the daily charge or credit in the quote currency, then convert to your account currency.
Forex trades settle T+2 (two business days after the trade date). A position held through Wednesday night settles on Friday, but the next settlement would be Monday (skipping Saturday and Sunday). So Wednesday's rollover covers 3 days of interest — Wednesday, Saturday, and Sunday — resulting in triple swap.
Rollover occurs at 5:00 PM Eastern Time (10:00 PM UTC) each trading day. This is the official end/start of the forex trading day. Positions open before and still held after this time will be charged or credited swap. The exact time may vary slightly by broker.
Yes. When you buy a currency with a higher interest rate than the one you sell, you earn positive swap. This is the basis of carry trading. For example, buying AUD/JPY historically earned positive swap because Australian interest rates were higher than Japanese rates.
A carry trade involves buying a high-interest-rate currency and selling a low-interest-rate currency to earn the interest rate differential (positive swap). Popular carry pairs historically include AUD/JPY, NZD/JPY, and USD/TRY. The strategy profits from both the swap income and potential price appreciation.
A swap-free or Islamic account does not charge or credit overnight swap, complying with Sharia law which prohibits earning or paying interest (riba). Instead, brokers may charge an administration fee or widen spreads. These accounts are available to traders of all backgrounds at most brokers.
In MT4/MT5: right-click a symbol in Market Watch → Specification → look for 'Swap Long' and 'Swap Short' values. These are typically in points (pips). You can also find them on your broker's website under contract specifications or instrument details.
Yes. Swap rates change frequently based on central bank interest rate decisions, interbank lending rates, and broker adjustments. Major changes occur after central bank meetings. Brokers typically update swap rates weekly, usually on Monday or Wednesday. Always check current rates before calculating.
The forex market is closed on weekends, but weekend swap is still charged — it is included in Wednesday's triple swap. So if you hold a position from Wednesday through Thursday, you pay 3 days of swap (for Wednesday, Saturday, and Sunday settlement).
For swing and position traders, swap can be a significant cost or income. Negative swap on popular pairs like EUR/USD can cost 3–8% annually on position value. Over weeks or months, this erodes profits substantially. Always factor swap into your trade plan for holds longer than a few days.
Swap points (or pips) is the fixed amount added/subtracted per lot per night — this is what brokers quote and what you enter in the calculator. Swap percentage expresses the annual cost/income relative to position value, making it easier to compare across pairs and position sizes.