Lots, pips and pip value: three calculations you cannot get wrong

Lots, pips and pip value are the three foundations —
and the three places beginners most often miscalculate, especially moving from currency pairs to
gold. One wrong multiplication here puts you in a trade at ten times the risk you intended, without
your noticing.

1. The lot: the unit of size

A lot measures how much you are trading. For currency pairs:

• 1 standard lot = 100,000 units of the base currency
• 0.1 lot (mini) = 10,000 units
• 0.01 lot (micro) = 1,000 units

Gold is a different animal: 1 lot of
XAU/USD = 100 ounces. That single fact
is behind most of the mistakes people make costing and sizing gold trades.

2. The pip: the unit of price movement

A pip is the conventional smallest price step for each instrument:

• Standard pairs (EUR/USD) — the fourth decimal: 1.1650 → 1.1651 is one pip.
• JPY pairs (USD/JPY) — the second decimal: 155.20 → 155.21 is one pip.
• Gold — conventions vary by broker, but one cent (0.01) is the usual step.

Most platforms also show one extra digit, the point or pipette, worth a tenth
of a pip. If the broker shows “spread 12” and you read 12 pips where it means 12 points (1.2 pips),
you are out by a factor of ten.

3. Pip value: the calculation that matters most

For pairs quoted against the dollar (EUR/USD,
GBP/USD, AUD/USD) it is
simple:

1 pip on 1 standard lot = $10

So 0.1 lot → $1 per pip; 0.01 lot → $0.10 per pip.

For gold, since one lot is 100 ounces:

A one-cent move = $1 on one lot

Which means gold moving $5 an ounce (500 cents) on one lot is $500 either way.
This is why carrying your usual EUR/USD size straight over to gold blows accounts up.

4. Working backwards: size from risk

This is the professional order — not choosing a size and then placing a stop, but the reverse:

Size = Amount you accept losing ÷ (Stop distance in pips × Pip value)

Example: a $5,000 account, risking 1% per trade ($50), with
a 25-pip stop on EUR/USD:

Size = 50 ÷ (25 × 10) = 0.2 lots

The same calculation on gold with a $3-an-ounce stop (300 cents):

Size = 50 ÷ (300 × 1) = 0.17 lots

5. Three common mistakes

• One size for every instrument. 0.5 lots of EUR/USD and 0.5 lots of gold are
  entirely different risks.
• Confusing pips with points. Count the decimals on your platform before you
  calculate anything.
• Forgetting that costs are measured in pips too. A 1.5-pip spread on one lot is
  $15 gone on entry — against a 20-pip target, that is 7.5% of the target before price moves.

6. Why size is tied to cost

Spread, commission and rebates are all calculated per lot, not per outcome. So
knowing exactly how many lots you trade in a month is the precondition for knowing your real cost
and the part of it you can recover.

A trader doing 20 lots a month at $15 a lot is paying $300 in costs — a figure worth knowing
precisely rather than estimating.

Sources

• Myfxbook — Forex calculators
• BabyPips — Margin and position size
• FXNX — Gold Spreads: Calculate Your True XAUUSD Trading Cost

This article is for information only and is not investment advice. Lot and pip conventions vary between brokers — check the contract specification before you calculate. Leveraged forex and CFD trading carries a high level of risk and can cost you your entire deposit.