- Spread is the entry cost (bid/ask gap) — on 1 lot EUR/USD, a 0.5 pip spread = $5 the moment you open
- Swap is the overnight interest credit or debit; charged triple on Wednesday to cover the weekend — swap-free (Islamic) accounts neutralise it
- A lot is contract size: 1 standard lot = 100,000 units, mini = 10,000, micro = 1,000 — pip value scales directly with lot size
- A pip is the standard price increment — 0.0001 on most pairs, 0.01 on JPY crosses — and it anchors every position-sizing calculation
- Position size formula: Lot = Risk Amount / (Stop Loss in Pips × Pip Value) — mis-sizing because these four concepts are fuzzy is the most common early-account killer
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Four concepts — spread, swap, lot, pip — sit under every forex trade. If any is fuzzy, every sizing and risk decision is guesswork. This is the one-page lesson: definitions, formulas, and a worked example for each.
1. Pip — the price increment#
A pip is the standard unit a price moves.
- On most pairs (EUR/USD, GBP/USD, AUD/USD): 1 pip = 0.0001.
- On JPY pairs (USD/JPY, EUR/JPY): 1 pip = 0.01.
- On gold (XAU/USD): brokers usually quote 1 pip = 0.10 (so a $1 move in gold = 10 pips).
A fractional pip (or "pipette") is 1/10 of a pip — shown as the 5th decimal on EUR/USD or the 3rd decimal on USD/JPY.
Pip value — the money per pip
Pip value depends on lot size and the quote currency.
| Pair | Lot | Pip value |
|---|---|---|
| EUR/USD | 1.00 (standard) | $10 |
| EUR/USD | 0.10 (mini) | $1 |
| EUR/USD | 0.01 (micro) | $0.10 |
| USD/JPY | 1.00 | ~$6.70 (varies with USD/JPY rate) |
| XAU/USD | 0.01 | $0.10 per pip ($1 per $1 move) |
Full depth: What is a pip in forex — pip value calculation.
2. Lot — contract size#
A lot is how many base-currency units you're trading.
| Lot type | Units | EUR/USD pip value |
|---|---|---|
| Standard | 100,000 | $10 |
| Mini | 10,000 | $1 |
| Micro | 1,000 | $0.10 |
| Nano (some brokers) | 100 | $0.01 |
On MT4/MT5 you type lots directly: 0.01 = 1 micro lot, 0.10 = 1 mini lot, 1.00 = 1 standard lot.
Why lot sizing matters: a $1,000 account risking 2% ($20) with a 20-pip stop on EUR/USD needs:
Lot = 20 / (20 × 10) = 0.10 → one mini lot.
Flip that to 1.00 lot and one 20-pip loss = $200 = 20% of the account. Same trade, same stop — catastrophic difference.
Full depth: What is a lot in forex — calculation guide · Position size & lot calculator guide.
3. Spread — the entry cost#
Spread = ask price − bid price. It's what you pay the broker on entry, built into the quote.
Example — EUR/USD:
- Bid: 1.08520 · Ask: 1.08525
- Spread = 0.5 pip
- On 1 standard lot: 0.5 pip × $10 = $5 cost the moment you open.
A scalper opening 20 trades per day on a 0.5 pip spread pays $100/day just in spread. A swing trader opening 3 per week pays $15. Spread cost scales with trade frequency, not with trade outcome.
Fixed vs variable spread
- Variable (floating): widens in volatile moments or thin liquidity (Asian session, news). Most STP/ECN accounts.
- Fixed: constant regardless of market — usually wider on average, easier to budget.
Raw spread + commission accounts
On "Zero / Raw / Ultra Low" accounts the quoted spread is near zero but the broker charges a commission (commonly $3–$7 per lot round-turn). Total cost can be lower than a standard account if your average spread was above the commission threshold.
Full depth: What is spread in forex — bid/ask explained · XM low spread accounts.
4. Swap — the overnight cost#
Swap (rollover) is the interest credit or debit for holding a position past 5 p.m. New York time. It reflects the rate differential between the two currencies, minus the broker's markup.
Three things to know:
- Direction matters. Long a high-rate currency vs a low-rate one: you may receive swap. The reverse: you pay.
- Wednesday = triple swap. Charged to account for the weekend, when rates still accrue but markets are closed.
- Not all brokers show the same swap. It depends on each broker's funding cost and markup — compare before you pick.
Worked example — 1 lot EUR/USD, held 5 nights
If your broker charges $−7/night on long EUR/USD: 5 nights = −$35. Add Wednesday triple (extra −$14) = −$49 total. On a small account this destroys a swing trade's edge quickly.
Islamic / swap-free accounts
Swap-free (Sharia-compliant) accounts neutralise overnight interest but typically replace it with a flat administration fee after a grace period (varies by broker). Useful for observant Muslim traders and for swap-heavy exotic pairs.
Full depth: Best swap rates broker comparison · Advantages of swap-free trading on XM · Islamic forex account — swap-free guide.
Tying it together — one end-to-end example#
You have a $500 account, you want to risk 1% ($5) on a EUR/USD long with a 25-pip stop.
- Lot size:
Lot = 5 / (25 × 10) = 0.02→ 2 micro lots. - Spread cost at 0.5 pip: 0.5 × ($0.10 × 2) = $0.10 entry cost.
- Hold 3 nights at −$0.70 swap per 0.01 lot: 3 × $1.40 = $4.20 overnight cost.
- 1:2 target (50-pip TP): profit if hit = 50 × $0.20 × 2 = $10, net ≈ $10 − $4.20 − $0.10 = $5.70.
Without understanding all four concepts, you'd either oversize (risk-of-ruin) or under-estimate holding cost (swap eats the edge).
Rule of thumb: if you can't tell me your per-trade lot, pip value, entry spread and expected swap before entry, you're guessing — not trading.
Quick self-test (5 questions)#
- On 0.10 lot EUR/USD, how many dollars is 1 pip? → $1.
- On XAU/USD, if gold moves from $2,400 to $2,405, how many pips? → 50 pips.
- On a 0.5-pip spread, 1 lot EUR/USD, what's your entry cost? → $5.
- Which day typically triples swap? → Wednesday.
- $200 account, 2% risk, 40-pip stop on EUR/USD — what lot? →
4 / (40 × 10) = 0.01→ 1 micro lot.
If you got 5/5, move on to Forex risk management guide. If not, reread the matching section above.
Reminder: trading forex on leverage involves significant risk and can exceed your deposit. This is educational content, not investment advice. Always verify pip values, spreads and swap rates for your specific account on the broker's official site.
Sources and references#
- ESMA — Product intervention measures relating to CFDs (cost & risk disclosures): https://www.esma.europa.eu/document/esma-decision-product-intervention-measures-cfds
- Bank for International Settlements — FX turnover & liquidity: https://www.bis.org/statistics/rpfx22.htm
- CFTC — Retail foreign exchange dealer rules (lot / margin conventions): https://www.cftc.gov/IndustryOversight/Intermediaries/RFEDs/index.htm
Comments 5
This pairs well with the other guides on this site. Reading them together gives a comprehensive picture of what's actually involved.
Exactly the reality check I needed. Was getting too caught up in social media traders showing unrealistic results.
I've been demo trading for two weeks and couldn't figure out why my EUR/USD position kept losing tiny amounts overnight even when price didn't move. The swap explanation here finally cleared that up — I was holding long positions while the swap was negative.
The real-world examples showing how a 2-pip spread on EUR/USD versus a 40-pip spread on an exotic pair completely changes the math on short-term strategies was something I needed to hear before I started scalping USD/TRY.
Quick question — when you say a micro lot is 1,000 units, does that mean on a $500 account with 1:100 leverage I could theoretically open 50 micro lots? I know that would be insane risk-wise but I want to make sure I understand the math correctly.
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