Lesson 10 of 20
Lot sizes and position size
8 min read
Chapter checkpoints
0/5- Lot size, units and pip value
- Why beginners should trade 0.01–0.10 lots
- Worked example: a $100 account
- The same trade, three sizes
- Sizing backwards
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A lot is simply a bundle of currency units. Rather than saying 'I want to buy 10,000 euros', you say '0.1 lots'. The lot size is the single biggest lever on how much money a given price move makes or costs you.
Lot size, units and pip value
Every lot size maps to a fixed number of currency units, and those units decide what one pip is worth in cash. The relationship is perfectly linear: halve the lot, halve the money per pip.
| Volume | Units | ≈ value per pip |
|---|---|---|
| 1.00 lot (standard) | 100,000 | $10.00 |
| 0.50 lot | 50,000 | $5.00 |
| 0.10 lot (mini) | 10,000 | $1.00 |
| 0.05 lot | 5,000 | $0.50 |
| 0.02 lot | 2,000 | $0.20 |
| 0.01 lot (micro) | 1,000 | $0.10 |
These numbers are approximate
The values above assume a USD-quoted pair such as EUR/USD or GBP/USD, where the pip value is fixed in dollars. On pairs like USD/JPY, USD/CAD or gold the pip value shifts slightly with the exchange rate, so treat $10 per standard lot as a working estimate, not an exact figure. Your platform shows the real value once the order ticket is open.
Why beginners should trade 0.01–0.10 lots
Small accounts and large lot sizes do not mix. Risking 1–2% per trade is only possible when the cash value of your stop loss is small, and that means small volume. Trading 0.01–0.10 lots is not being timid — it is the only way the maths of proper risk management works on a modest balance.
- A $100 account risking 2% can only afford to lose $2 on a trade — that is a fraction of one pip at a standard lot.
- Micro lots let you place the stop where the chart says it belongs instead of squeezing it to fit an oversized position.
- Smaller size keeps losing streaks survivable: ten losses in a row at 1% still leaves you around 90% of your account.
- You can scale up gradually as the balance grows — the percentages stay the same, only the volume changes.
Worked example: a $100 account
You have $100 and you want to risk 2% on a EUR/USD trade with a 20-pip stop loss. Work it through step by step.
- 1Risk in cash: 2% of $100 = $2.00.
- 2Cost per pip you can afford: $2.00 ÷ 20 pips = $0.10 per pip.
- 3Match that to a lot size: $0.10 per pip is the micro lot — 0.01 lots.
- 4Sanity check: 0.01 lots × 20 pips × $0.10 = $2.00. Exactly the planned risk.
Change any input and the answer moves with it. Same $100 account with a 10-pip stop allows $0.20 per pip, or 0.02 lots. A wider 40-pip stop would need $0.05 per pip — below the smallest tradable size at most brokers, which is your signal that the trade is too big for the account and should be skipped.
Do it automatically
Rather than doing this arithmetic on every setup, use the position size calculator walkthrough in Module 4 — Position sizing in practice — which turns account balance, risk percentage and stop distance into an exact lot size every time.
The same trade, three sizes
Imagine a EUR/USD trade with a 50-pip stop loss. The idea, the entry and the exit are identical in all three cases — only the volume changes.
| Volume | Loss if stopped | % of a $2,000 account |
|---|---|---|
| 1.00 lot | $500 | 25% — reckless |
| 0.10 lot | $50 | 2.5% — still high |
| 0.04 lot | $20 | 1% — sensible |
Sizing backwards
- 1Decide the money you are willing to lose (1% of account).
- 2Measure the stop distance in pips.
- 3Volume = risk amount ÷ (stop in pips × pip value per lot).
- 4Round down, never up.
The beginner trap
Choosing a lot size too large for the account balance is the single most common way beginners blow up. New traders pick a volume first and then place the stop wherever it 'feels' safe. Always do it the other way round: the chart decides the stop, the stop decides the size.
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