Understand base vs quote currency and pips

Overview

Every forex trade involves exchanging one currency for another. Understanding base currency, quote currency, and pips is fundamental to reading prices, calculating profits/losses, and managing position sizes in the forex market.

Core Concepts

Key points:

• Always appears first in the pair (e.g., EUR in EUR/USD)
• The "base" amount is always 1 unit
• Your position direction applies to this currency (long = buying base, short = selling base)

Key points:

• Always appears second in the pair (e.g., USD in EUR/USD)
• The price tells you: "How many quote currency units = 1 base unit?"
• Interest rates and swap charges are often denominated in quote currency

$\text{Price} = \frac{\text{Amount of Quote Currency}}{\text{1 Unit of Base Currency}}$

Derivation from first principles:

Start with the basic exchange concept: trading currency A for currency B.

1. Define the ratio: If 1 EUR can be exchanged for 1.10 USD, we write this exchange rate as: $\text{Rate} = \frac{1.10 \text{ USD}}{1 \text{ EUR}}$

2. Standard notation: Forex markets standardize this as "EUR/USD = 1.1000"

   • EUR is base (numerator, what we're measuring "one of")
   • USD is quote (denominator, what we're measuring it IN)

3. Reading the price: EUR/USD = 1.1000 means: $1 \text{ EUR} = 1.10 \text{ USD}$ Or equivalently: $\text{To buy 1 EUR, you need 1.10 USD}$

Why this matters: If EUR/USD rises from 1.1000 to 1.1500, the base currency (EUR) has strengthened - it now buys more USD. If it falls to 1.0500, EUR has weakened - it buys less USD.

What it means:

• 1 EUR = 1.1850 USD
• To buy 1 EUR, you pay 1.1850 USD
• To buy 100 EUR, you pay 118.50 USD

Why this step? We multiply: $100 \times 1.1850 = 118.50$

Direction interpretation:

• If you "buy EUR/USD," you're buying EUR and selling USD
• If you "sell EUR/USD," you're selling EUR and buying USD

If price moves to 1.2000:

• EUR strengthened (each EUR now buys more USD)
• If you bought at 1.1850, you profit
• Your 1 EUR can now be sold for 1.2000 USD instead of 1.1850 USD
• Profit per EUR: $1.2000 - 1.1850 = 0.0150$ USD

What it means:

• Base = USD, Quote = JPY
• 1 USD = 110.50 JPY
• To buy 1 USD, you pay 110.50 JPY
• To buy 1,000 USD, you pay 110,500 JPY

Why this format? JPY is weaker than USD, so it takes many JPY to buy one USD. The quote currency (JPY) is in larger numbers.

Direction interpretation:

• If you "buy USD/JPY," you're buying USD and selling JPY
• If price rises to 115.00, USD strengthened (each USD buys more JPY)
• If price falls to 105.00, USD weakened (each USD buys less JPY)

Understanding Pips

Why pips exist: Forex prices change by tiny amounts. Instead of saying "the price moved by 0.0035 dollars," traders say "it moved 35 pips." It's a standardized unit that makes communication clearer and calculation easier.

For JPY pairs: $1 \text{ pip} = 0.01 \text{ JPY}$

Pip value in account currency: $\text{Pip Value} = \frac{\text{Trade Size (in base units)} \times \text{Pip Size}}{\text{Exchange Rate to Account Currency}}$

Derivation:

1. Start with the price change: If EUR/USD moves from 1.1850 to 1.1851, the change is: $\Delta \text{Price} = 1.1851 - 1.1850 = 0.0001$ This 0.0001 = 1 pip

2. Calculate change for position size: For a position of 10,000 EUR: $\text{Value change} = 10,000 \times 0.0001 = 1\text{ USD}$

   Why? Each EUR in your position changed by 0.0001 USD, so total change = position size × price change.

3. Standard lot: A standard lot is 100,000 units of base currency. For 1 standard lot EUR/USD: $\text{Pip value} = 100,000 \times 0.0001 = 10 \text{ USD}$

4. Mini lot (10,000 units): Pip value = 10,000 × 0.0001 = 1 USD

5. Micro lot (1,000 units): Pip value = 1,000 × 0.0001 = 0.10 USD

Step 1: Find pip movement $\text{Pip movement} = \frac{1.1920 - 1.1850}{0.001} = \frac{0.0070}{0.0001} = 70 \text{ pips}$

Why this step? Divide the total price change by the pip size to get number of pips.

Step 2: Calculate pip value For EUR/USD standard lot: $\text{Pip value} = 10 \text{ USD per pip}$

Why? Standard lot = 100,000 EUR, pip size = 0.0001, so 100,000 × 0.001 = 10 USD.

Step 3: Calculate total profit $\text{Profit} = 70 \text{ pips} \times 10 \text{ USD/pip} = 700 \text{ USD}$

Verification using direct calculation:

• Bought 100,000 EUR at 1.1850 USD each: Cost = $100,000 \times 1.1850 = 118,500$ USD
• Sold 100,000 EUR at 1.1920 USD each: Revenue = $100,000 \times 1.1920 = 119,200$ USD
• Profit = $119,200 -118,500 = 700$ USD ✓

Step 1: Find pip movement For JPY pairs, 1 pip = 0.01: $\text{Pip movement} = \frac{110.50 - 109.80}{0.01} = \frac{0.70}{0.01} = 70 \text{ pips}$

Why positive? You sold (shorted) at 110.50 and price fell to 109.80. You profit when price falls after selling.

Step 2: Calculate pip value in JPY For USD/JPY standard lot: $\text{Pip value in JPY} = 100,000 \times 0.01 = 1,000 \text{ JPY per pip}$

Why? Standard lot = 100,000 USD (base currency), pip size for JPY = 0.01.

Step 3: Total profit in JPY $\text{Profit} = 70 \text{ pips} \times 1,000 \text{ JPY/pip} = 70,000 \text{ JPY}$

Step 4: Convert to USD (if needed) At current rate109.80: $\text{Profit in USD} = \frac{70,000}{109.80} \approx 637.52 \text{ USD}$

Why this step? Your profit is in JPY (quote currency), but if your account is in USD, you need to convert back.

Why it feels right: The number got bigger, so something must be "more valuable."

The steel-man: This is backwards. The price is quoted in USD per EUR. A higher price means each EUR buys MORE USD, so EUR strengthened.

The fix:

• Think of the pair as "How many quote (USD) to buy one base (EUR)?"
• Higher price → base currency stronger
• Lower price → base currency weaker

Memory trick: EUR/USD going UP = EUR going UP (relative to USD).

Why it feels right: The difference is 0.05, and for most pairs 0.001 would be 1 pip, so 0.05 would be 500 pips... wait, that doesn't match.

The steel-man: JPY is quoted to 2 decimals, not 4. The movement of 0.05 is actually 5 pips for JPY pairs (each pip = 0.01).

The fix:

• Most pairs: 4 decimals,1 pip = 0.0001 (e.g., EUR/USD: 1.1850 → 1.1851 = 1 pip)
• JPY pairs: 2 decimals, 1 pip = 0.01 (e.g., USD/JPY: 110.50 → 110.51 = 1 pip)

Why it feels right: "Standard lot pip value is 10 USD, so that's the pip value."

The steel-man: The 10 USD pip value is for 1 full standard lot (100,000 units). If you trade 0.5 lots, your position is only50,000 units.

The fix: $\text{Pip value} = \text{Position size} \times \text{Pip size}$ $\text{Pip value} = 50,000 \times 0.0001 = 5 \text{ USD}$

Why this matters: Risk management depends on accurate pip values. If you think a 50-pip stop loss costs 500 USD (50 × 10) but it actually costs 250 USD (50 × 5), you're sizing positions incorrectly.

Practical Application

Your trade:

• Action: Buy (long) EUR/USD
• Position size: 0.1 lots (10,000 EUR)
• Entry: 1.1850
• Stop loss: 1.1800
• Take profit: 1.1950

Risk calculation: Pip risk = $\frac{1.1850 - 1.1800}{0.0001} = 50$ pips

Pip value for 10,000 units: $10,000 \times 0.0001 = 1$ USD per pip

Risk in dollars: $50 \text{ pips} \times 1 \text{ USD/pip} = 50$ USD

Reward calculation: Pip reward = $\frac{1.1950 - 1.1850}{0.0001} = 100$ pips

Reward in dollars: $100 \text{ pips} \times 1 \text{ USD/pip} = 100$ USD

Risk:Reward ratio: $\frac{100}{50} = 2:1$ (good ratio)

Outcome if stop loss hit:

• Your 10,000 EUR bought at 1.1850 = 11,850 USD cost
• Sold at 1.1800 = 11,800 USD revenue
• Loss = $11,800 - 11,850 = -50$ USD ✓

For pips: "J-P-Y = Just-Two-Places" - JPY pairs use 2 decimal places for pips, everything else uses 4.

The "price" EUR/USD = 1.18 means: "If I give you 1 chocolate bar, you give me 1.18 packs of gummy bears." The chocolate (EUR) is the "base" - the thing being traded. The gummy bears (USD) are the "quote" - what you're quoting the price in.

If tomorrow the price becomes 1.25, that means chocolate got MORE valuable - now1 chocolate bar gets you 1.25 gummy bear packs instead of just 1.18!

A "pip" is just a tiny change in this price. Instead of saying "the price went from 1.1800 to 1.1850," which is confusing, traders just say "it moved 50 pips" (count the fourth decimal place). It's like saying "the temperature went up 5 degrees" instead of listing exact numbers.

When you "buy EUR/USD," you're betting that chocolate will become more valuable compared to gummy bears. When you "sell EUR/USD," you're betting chocolate will become less valuable. That's it!

Connections

• Currency Pair Types - Major, minor, and exotic pairs
• Lot Sizes and Position Sizing - How position size affects pip value
• Bid-Ask Spread - The cost of entering/exiting trades in pips
• Stop Loss and Take Profit Orders - Setting risk/reward in pips
• Leverage in Forex - How leverage amplifies pip movements
• Cross Currency Pairs - Pairs without USD
• Exchange Rate Mechanics - Economic factors moving currency pairs
• Forex Risk Management - Using pip values for position sizing
• Carry Trade Strategy - Interest rate differentials between currencies

#flashcards/stock-market

What is the base currency in a forex pair? :: The first currency in the pair (numerator). It's the currency being bought or sold, and always represents1 unit when reading the price.

Concept Map

Hinglish (regional understanding)