Forex Trading Tools

Forex Swap Calculator – Understand Rollover Credits and Debits

Forex Swap Calculator

Forex trading involves buying and selling currencies, and most trades are not settled immediately. Instead, trades are rolled over each day, resulting in credits or debits from swaps. A forex swap calculator can help traders understand and estimate these swap fees and properly account for them. This comprehensive guide will explain what forex swaps are, how they work, and how to use a swap calculator for trading.

What is a Forex Swap?

A forex swap, also known as a rollover, refers to the interest fees charged or earned for holding a position overnight. Since forex trades are not settled immediately, they are essentially short-term loans that incur interest.

When trading currencies with different interest rates, the trade will result in a credit or debit applied to the account each night. These swap points can have a significant cumulative impact on trading profits.

How Do Forex Swaps Work?

Forex swaps exist because of the difference in interest rates between the currencies being traded. For example:

The opposite is true for short EUR/USD positions – traders will be credited interest each day for holding the position.

The actual swap rates are based on the overnight interest rates set by central banks. The calculation gets more complex for currency pairs without USD, but it still involves comparing the two interest rates.

Key Points on Forex Swaps:

  • Swaps are credited/debited each night a position is held.
  • They are based on the interest rate differential between the traded currencies.
  • Swaps will be positive or negative depending on the trade direction.
  • High-yielding currencies like AUD and NZD tend to have positive swaps.
  • Low-yielding currencies like EUR and JPY tend to have negative swaps.
  • Swap rates change regularly based on central bank rate decisions.

Why Do Swap Rates Matter for Traders?

While individual swap fees are generally small, they can add up over time for larger position sizes. For short-term traders, swaps rarely make a significant difference in profits.

However, swaps become very relevant for longer-term trades held for weeks or months. The cumulative credits and debits affect overall profitability.

Traders need to be aware of swap rates and account for them in planning trades and setting profit targets. Failing to estimate swap fees means profits and loss calculations will be incorrect.

Understanding swaps allows traders to incorporate them into trading strategies. For example:

  • Carry trades – harnessing positive swaps from high yield currencies.
  • Hedging – using correlated pairs trades to offset negative swaps.
  • Rollover day trading – profiting from predictable swaps on Wednesdays.

In summary, while swaps seem minor individually, their cumulative effects make them an important consideration in forex trading.

How to Calculate Forex Swaps

The calculation for swap rates on a particular currency pair will depend on:

  • The interest rate differential between the currencies
  • The trade size or pip value
  • The number of days the position is held

The basic formula is:

Swap fee = (Interest Rate Differential x Trade Size x Days Held) / 360 (or 365)

Most brokers convert the raw swap points into US dollars so traders can easily understand the amounts being credited/debited.

Let’s see some examples of estimating swap rates.

Calculating Swaps on EUR/USD

For a 100,000 EUR/USD position held overnight:

  • EUR interest rate: -0.50%
  • USD interest rate: 2.00%
  • Interest rate differential: 2.50% (2.00% – -0.50%)
  • Trade size: 100,000 EUR x 0.0001 per pip = $10 per pip
  • Days held: 1
  • Calculation: (0.0250 x $10 x 1) / 360 = -$0.07 (rounded)

The -0.07 USD means the trader would be charged $0.07 for holding this long EUR/USD position overnight.

Now if the position was short EUR/USD instead:

  • Interest rate differential: 2.50%
  • Trade size: 100,000 EUR x 0.0001 per pip = $10 per pip
  • Days held: 1
  • Calculation: (0.0250 x $10 x 1) / 360 = $0.07
MUST READ  MyFXBook Review: Track and Analyze Your Trading Like a Pro in 2024

The $0.07 USD indicates the swap credit received overnight for holding short EUR/USD.

Calculating Swaps on Exotic Currency Pairs

If trading a pair without USD, the calculation involves adding/subtracting the two interest rates.

For a 100,000 NZD/JPY position held overnight:

  • NZD interest rate: 3.00%
  • JPY interest rate: -0.10%
  • Rate differential: 3.00% + -0.10% = 2.90%
  • Trade size: 100,000 NZD x 0.001 per pip = $70 per pip
  • Days held: 1
  • Calculation: (0.0290 x $70 x 1) / 360 = $0.56

So this NZD/JPY position would earn a $0.56 positive rollover fee.

Accounting for Triple Swaps on Wednesdays

Most pairs only apply one overnight swap at 5pm EST between Tuesday and Wednesday. But between Wednesday and Thursday, there is a triple swap charged to account for the upcoming weekend:

Wednesday to Thursday swap fee = (1-day fee x 3)

So in the EUR/USD example above, the Wednesday overnight would be:

-($0.07 x 3) = -$0.21 instead of -$0.07

Swap Calculator Examples

Let’s see some examples using specific trade details in a forex swap calculator:

Currency PairTrade SizeInterest DifferentialDays HeldSwap Fee
EUR/USD Long100,000-2.50%1-$0.07
EUR/USD Short100,0002.50%1$0.07
NZD/JPY Long100,0002.90%1$0.56
AUD/USD Long50,0003.00%4$1.20
GBP/JPY Short30,000-1.50%14-$5.04

Swap calculators allow traders to easily estimate rollover fees for any position. The fees can then be incorporated into trading plans and profit/loss estimates.

Using a Forex Swap Calculator

A swap calculator simplifies the process of estimating rollover fees. Here are some tips for using one effectively:

  • Check broker data – Some calculators show generalized swap points. Verify rates with your broker’s specifics.
  • Enter trade details – Calculate with your actual trade size and direction. The currency pair and interest rates are set.
  • Note triple swaps – Be aware Wednesdays have triple rollovers. Adjust holding days accordingly.
  • Estimate cumulative swaps – For longer-term trades, calculate total swaps for the full holding period.
  • Account for swaps in profit goals – Set profit targets higher for debit swaps, lower for credit swaps.
  • Update periodically – Interest rates change, so update swap estimates every 1-2 weeks.

With some effort, traders can accurately account for forex swaps and incorporate them into trading strategies and plans. Taking the time to understand swap calculations provides an edge.

Martingale Betting Calculator
Martingale betting calculator

Swap-Free Forex Trading Accounts

Some brokers offer Islamic/swap-free accounts to comply with Islamic religious restrictions on interest. These accounts do not pay or charge swaps on overnight positions.

While eliminating swaps, these accounts often feature:

  • Higher spreads to compensate for lost swap revenue
  • Commissions on each trade
  • Limited access to higher leverage

Swap-free accounts can benefit long-term traders avoiding debits. But the costs may outweigh the swap savings for short-term trading.

Frequently Asked Questions

1. Why are swaps called rollovers?

The term rollover comes from how positions are automatically “rolled over” each night at 5pm EST. Instead of closing trades daily, they are held open and swaps applied. So traders are “rolling over” their positions to the next trading day.

2. When are swap fees charged/credited?

Forex swaps are calculated and applied overnight between 5pm-6pm EST each trading day. The exception is Wednesday, when triple swaps occur for the upcoming weekend.

3. How can I determine if a currency pair will have positive or negative swaps?

Compare the interest rates of the two currencies. The currency with the higher interest rate will earn a credit rollover when traded long. The lower rate currency will incur a debit when traded long due to borrowing costs.

4. Why are swap rates constantly changing?

Swap rates derive from the underlying interest rates set by central banks. As banks adjust monetary policy and rates, the interest rate differentials change, leading to different swap fees for currency pairs.

5. Can I avoid swaps with daily reset trading?

Yes, closing all positions by 5pm EST and not holding trades overnight will avoid any swap fees. However, this requires active trading each day. Swaps only apply on positions held overnight.

6. How are swaps shown on my account – in pips or cash value?

Most brokers now convert raw swap points into dollar values for easier accounting. But some may still show the swap rates in pips that are applied. You’ll need to calculate the dollar values manually based on trade size. Check with your broker.


While complex on the surface, swap rates ultimately come down to interest rate differentials between traded currencies. Using a swap calculator simplifies estimating position rollovers.

Traders should take the time to understand forex swaps and incorporate them into their planning and strategies. Accurately accounting for swaps provides greater precision in calculating profits and losses.

Knowing how to leverage swap credits and minimize debits can lead to improved trading outcomes over time. Swaps may seem insignificant at first, but their ongoing impact makes them a critical element of forex trading.


About Amelia Clarke

Enhance your Forex Trading with BEST MT4 EA. Constant Profit with Proper Money Management Advice & Less Drawdown. Order Now & Get Special Discount.

One thought on “Forex Swap Calculator – Understand Rollover Credits and Debits

Comments are closed.