Exchange Rates Guide: How Currency Exchange Works

Complete guide to understanding exchange rates, markups, and how to get the best rates on your international money transfers.

12 min read • Updated October 28, 2025

What Are Exchange Rates?

Exchange rates determine how much one currency is worth in terms of another. If EUR/USD is 1.10, one Euro equals $1.10 USD.

These rates fluctuate constantly. Understanding them is crucial because the rate you get often costs more than the transfer fee.

💡 Key Insight:

On a $1,000 transfer, a 3% worse exchange rate costs $30 often more than the transfer fee.

The Mid-Market Rate Explained

The mid-market rate (also called interbank or real rate) is the midpoint between buy and sell prices. This is the "true" exchange rate with no markup.

Example: EUR/USD Mid-Market Rate

Banks buy EUR at:$1.0950
Banks sell EUR at:$1.1050
Mid-market rate:$1.1000

Wise - Only Service with 0% Markup

Wise uses the real mid-market rate. What you see on Google is what you get. Saves 2-6% vs others.

Understanding Exchange Rate Markups

ServiceMid-MarketTheir RateMarkupCost/$1k
Wise1.10001.10000%$0
PayPal1.10001.13963.6%$36
Bank Wire1.10001.17046.4%$64

⚠️ Hidden Cost Alert:

Monthly $1,000 transfers with 4% markup: $480 per year in hidden costs.

Calculating Real Exchange Costs

Step-by-Step

  1. 1. Find mid-market rate: Google "USD to EUR" → 1 EUR = $1.10
  2. 2. Get service's rate: Service offers 1 EUR = $1.14
  3. 3. Calculate markup: (1.14 - 1.10) / 1.10 × 100 = 3.6%
  4. 4. Dollar cost: $1,000 × 3.6% = $36

How to Get the Best Exchange Rates

1. Use Wise for 0% Markup

Wise is the only major service using the real mid-market rate. Saves 2-6% vs competitors.

2. Transfer During Market Hours

  • Best: Weekdays, 8am-5pm EST
  • Avoid: Weekends (spreads widen 0.5-1%)

3. Avoid These Places

  • Airport exchanges: 8-15% markup
  • Hotel exchanges: 10-18% markup
  • Credit card DCC: 3-7% markup

Understanding Major Currency Pairs

Different currency pairs have different characteristics. Here's what you need to know:

EUR/USD - Most Traded Pair

Characteristics:

  • • Highest liquidity - tightest spreads
  • • Typical daily range: 0.5-1%
  • • Best rates during EU/US overlap (8am-12pm EST)
  • • Affected by ECB and Fed policies

Current Rate Context:

  • • 10-year average: ~1.15
  • • Historical high: 1.60 (2008)
  • • Historical low: 0.82 (2000)
  • Use Wise: Save $36 per $1,000 vs PayPal

GBP/USD - "Cable" Rate

Characteristics:

  • • High volatility - 1-2% daily swings common
  • • Sensitive to Brexit, UK politics
  • • Best liquidity: 8am-12pm EST
  • • Higher markup at most services (0.5-1%)

Transfer Tips:

  • • Very efficient Wise corridor (0.35% fee)
  • • Avoid transfers during UK political events
  • • Use rate alerts for large amounts
  • • Weekend spreads 1% wider

USD/MXN - High Volume Corridor

Characteristics:

  • • Highest remittance corridor ($50B+/year)
  • • Emerging market - more volatile
  • • Typical range: 18-25 MXN per USD
  • • Affected by oil prices, US policy

Best Practices:

  • • Services add 2-5% markup typically
  • • Wise offers 0% markup here too
  • • Avoid Western Union (5-7% markup)
  • • Timing matters less - consistent spreads

USD/INR - Growing Corridor

Characteristics:

  • • Managed float - RBI controls range
  • • Stable within 1-2% monthly range
  • • Historical range: 60-85 INR per USD
  • • Student/IT worker transfers common

Special Considerations:

  • • Requires PAN card for large transfers
  • • Purpose code mandatory
  • • Banks add 3-5% markup
  • Wise: 0.6% fee, 0% markup

Real-World Exchange Rate Impact

Example #1: Student Tuition - Exchange Rate Timing Matters

Scenario: Paying £10,000 university tuition from USA over 3 months

❌ Option 1: Pay immediately at unfavorable rate

  • • GBP/USD rate: 1.28 (poor rate during GBP strength)
  • • Cost: £10,000 × 1.28 = $12,800
  • • Wise fee (0.35%): $45
  • • Total: $12,845

Option 2: Use rate alert, wait 2 weeks for better rate

  • • GBP/USD rate: 1.25 (improved 2.3%)
  • • Cost: £10,000 × 1.25 = $12,500
  • • Wise fee (0.35%): $44
  • • Total: $12,544

💰 Savings from timing: $301 (2.3% better rate)

If paying multiple terms, this strategy saves $900-1,200 annually.

Example #2: Family Support - Markup vs Fee Comparison

Scenario: Sending $1,000/month to Mexico

ServiceReal RateTheir RateFeeTotal Cost
Wise20.0020.00$5$5
Remitly20.0020.40$4$24
PayPal20.0020.72$35$71
Western Union20.0021.00$15$65

Annual Impact:

  • • Wise: $60/year
  • • Remitly: $288/year
  • • PayPal: $852/year
  • • Western Union: $780/year

💰 Switching to Wise saves $720-792/year vs alternatives

Example #3: Business Payments - Rate Fluctuation Risk

Scenario: US company paying European contractor €50,000 over year

Rate Fluctuation During Year:

• January: 1 EUR = $1.08€50,000 = $54,000
• April: 1 EUR = $1.12 (+3.7%)€50,000 = $56,000
• September: 1 EUR = $1.06 (-5.4%)€50,000 = $53,000
• Range difference:$3,000 (5.6%)

Solutions:

  • Forward Contract (XE/OFX): Lock rate at 1.09 for whole year = $54,500 total (removes uncertainty)
  • Rate Alerts (Wise): Transfer when rate is favorable (below 1.09)
  • Monthly Strategy: Transfer €4,167/month at varying rates = ~$54,200 average

What Drives Exchange Rate Changes

1. Interest Rate Differentials (Most Important)

Higher interest rates attract foreign investment, strengthening currency.

Real Example (2024-2025):

  • • US Federal Reserve raised rates to 5.5%
  • • ECB raised to 4.0% (1.5% differential)
  • • Result: USD strengthened 8% vs EUR
  • • Impact: $1,000 transfer cost $80 more at end vs beginning of year

2. Economic Data Releases

Strong economic data strengthens currency as it signals healthy economy.

Key Reports (avoid transferring 1-2 hours after):

  • Employment data: First Friday monthly (8:30am EST) - can move rates 0.5-1%
  • GDP reports: Quarterly - major indicator
  • Inflation (CPI): Monthly - directly affects Fed decisions
  • Central bank meetings: Fed (8x/year), ECB (8x/year) - can cause 1-2% swings

3. Political Events & Uncertainty

Political instability weakens currency as investors seek safer alternatives.

Historical Examples:

  • Brexit Vote (2016): GBP fell 10% overnight (£10,000 suddenly cost $1,000 more)
  • 2016 US Election: USD gained 5% in weeks after
  • Greek Debt Crisis: EUR weakened 15% over months

⚠️ Avoid large transfers during major political events if possible

4. Trade Balance & Current Account

Countries exporting more than importing have stronger currencies.

Germany/China: Large trade surpluses → stronger EUR/CNY

USA: Trade deficit but reserve currency status → mixed impact

Exchange Rates: Business vs Personal Transfers

Personal Transfers

Best Strategy:

  • • Use Wise for lowest fees + 0% markup
  • • Set rate alerts for non-urgent transfers
  • • Transfer weekdays for better rates
  • • Consolidate small transfers

When Rate Matters Most:

  • • Tuition payments ($10,000+)
  • • Property purchases
  • • Large one-time transfers
  • • Retirement fund transfers

Business Transfers

Advanced Strategies:

  • • Forward contracts to lock rates (XE, OFX)
  • • Hedging with options for large exposure
  • • Multi-currency accounts (Wise Business)
  • • Regular payment schedules

When to Hedge:

  • • International payroll ($50,000+/month)
  • • Regular supplier payments
  • • Multi-year contracts
  • • Thin profit margins (under 10%)

Forward Contract Example:

Company needs to pay €100,000 in 6 months. Current rate: 1.10, but could go to 1.15 (costing $5,000 more).

Without hedge: Risk $105,000-115,000 depending on rate movement

With forward contract: Lock 1.11 = exactly $111,000 (certainty for budgeting)

• Cost: 0.5-1% fee ($550-1,100) for rate certainty

Frequently Asked Questions

What is the mid-market exchange rate?

The mid-market rate is the midpoint between buy and sell prices. It's the "true" rate with no markup. Only Wise uses this rate.

What is exchange rate markup?

Markup is the hidden fee added to the exchange rate. If the real rate is 1.10 but you get 1.14, the 3.6% difference is markup costing $36 per $1,000.

Where can I check real-time exchange rates?

Multiple reliable sources show the real mid-market rate:

  • Google: Search "USD to EUR" - shows mid-market rate from multiple sources
  • XE.com: Professional forex data, historical charts, rate alerts
  • Bloomberg/Reuters: Real-time institutional rates
  • Wise app: Shows mid-market rate + their exact fee

Always compare: Get mid-market rate, then see what services offer. If difference is over 1%, you're paying hidden markup.

How much do exchange rate markups really cost me?

Markups are percentage-based, so they scale with your transfer amount:

1% markup on $500$5 cost
3% markup on $1,000$30 cost
4% markup on $5,000$200 cost
5% markup on $10,000$500 cost

Annual impact: Monthly $1,000 transfer with 4% markup = $480/year wasted. Wise (0% markup) saves you all of this.

Why do banks and PayPal add exchange rate markups?

It's their primary profit source on international transfers:

  • Hidden profit: Most customers don't check the real rate, so they don't notice 3-6% markup
  • Legal loophole: They must disclose fees but not rate markup
  • Maximizes revenue: PayPal makes MORE from markup ($36/1k) than fees ($35/1k)
  • No transparency: They show "competitive rate" without comparing to mid-market

Wise disrupted this: By using mid-market rate (0% markup) and showing transparent fees, forcing others to slowly improve.

Do exchange rates change during my transfer?

Depends on when the rate is locked:

Rate Locked at Initiation (Wise, most online services):

Rate shown when you start transfer is guaranteed. Even if rate moves 5% during processing, you get the original rate. This protects you.

⚠️ Rate Locked at Processing (Some banks):

Rate locked when bank processes (1-3 days later). If rate worsens, you pay more. If improves, you might save. Adds uncertainty.

Always ask: "Is the rate guaranteed at initiation?" before transferring.

Should I wait for a better exchange rate?

Depends on urgency and amount:

Worth Waiting If:

  • • Transfer over $5,000
  • • Not time-sensitive (can wait 2-4 weeks)
  • • Rate currently unfavorable (check 30-day average)
  • • Potential savings over 2% ($100+ on $5k)

✗ Don't Wait If:

  • • Urgent payment (bills, tuition deadline)
  • • Small transfer (under $1,000)
  • • Rate at 30-day average already
  • • Savings under $20-30

Smart approach: Set rate alert on Wise/XE. Transfer automatically when target rate reached. No daily monitoring needed.

Are weekend exchange rates worse than weekday rates?

Yes, significantly worse - avoid weekend transfers:

Weekend Impact:

  • Spreads widen 0.5-1%: Services add extra markup when markets closed
  • Cost on $1,000: Extra $5-10 vs weekday transfer
  • Why it happens: Less liquidity, services cover risk of Monday gap
  • Annual impact: If transferring weekends monthly = $60-120/year wasted

Best practice: Always transfer Tuesday-Thursday, 8am-4pm EST when both major markets (London + New York) are open.

Can I negotiate better exchange rates with my bank?

Yes, but only for very large transfers:

Negotiation Leverage:

  • $50,000+: May reduce fee from $45 to $25-35
  • $100,000+: May reduce rate markup from 4% to 2-3%
  • $500,000+: Significant negotiation possible, treasury desk involvement
  • Regular transfers: Better rates if $100k+/month volume

Reality check: Even negotiated bank rates (2% markup on $100k = $2,000) are worse than Wise (0.41% = $410). Banks rarely match specialized services.

What's the difference between spot rate and forward rate?

Important for business transfers and currency hedging:

Spot Rate

  • • Current market rate
  • • For immediate delivery (1-2 days)
  • • What you see on Google/XE
  • • Changes constantly during market hours
  • Use for: Regular personal transfers

Forward Rate

  • • Agreed rate for future date (1-12+ months)
  • • Locks in today for delivery later
  • • Includes interest rate differential
  • • Protects against adverse moves
  • Use for: Business contracts, large planned transfers

Example: Spot EUR/USD = 1.10. Forward 6-month = 1.11 (includes US higher interest rates). Lock 1.11 now, transfer in 6 months at that rate regardless of market.

How much does poor exchange rates cost over a year?

Annual cost compounds significantly - real examples:

Annual Cost of Rate Markup:

$500/month @ 3% markup (typical PayPal)$180/year lost
$1,000/month @ 4% markup (typical bank)$480/year lost
$2,000/month @ 5% markup (Western Union)$1,200/year lost
Switching to Wise (0% markup):Save $180-1,200/year

Over 5 years: Regular $1,000/month transfer with 4% markup costs $2,400 extra vs using Wise. That's significant money lost to hidden markups.

Key Takeaways on Exchange Rates

  • Use Wise for 0% markup - saves 2-6% on every transfer
  • Exchange rate markup often costs more than transfer fees
  • Always check mid-market rate on Google/XE.com before transferring
  • Avoid airport/hotel exchanges (8-18% markup)
  • Transfer weekdays during market hours for best rates

Get the Best Exchange Rates

Compare rates and see how much you can save.