Lot Sizes Explained: Standard, Mini, Micro and Nano Lots

A lot is a unit count, nothing more

A "lot" is not an amount of risk and it is not an amount of money. It is a fixed number of units of the base currency. Everything else people attach to it — how scary it is, how much it pays, whether you "deserve" to trade it — comes later, from arithmetic.

Those four are standardised enough that nearly every forex broker uses them, though not every broker offers every size. A broker's minimum lot step tells you the increments it accepts: a step of 0.01 means you can trade 0.01, 0.02, 0.03 and so on, which is one micro lot at a time. Some brokers allow a step of 0.001.

The unit is what matters, because risk is calculated on units. Whether your platform asks for "lots" or "units", it is asking the same question: how many units of the base currency.

What one pip is worth at each size

On pairs quoted in USD against a USD account — EUR/USD, GBP/USD, AUD/USD — one pip is 0.0001 of price, and it is already roughly 1 USD per 10,000 units. The table gives pip values for a USD-denominated account.

Two things change that picture. First, on JPY pairs a pip is 0.01 of price, not 0.0001, which is why the JPY columns are not simply ten times smaller. Second, when the quote currency is not your account currency, the pip value has to be converted — the rate moves every day, so does the pip value.

Read the standard-lot row once more: a standard lot on EUR/USD loses about 200 USD on a 20-pip move. On a 1,000 USD account that is 20% of the account on one ordinary-looking move, which is why small accounts are told to trade micro lots. It is not snobbery. It is arithmetic: the unit count is ten times smaller, so the loss is ten times smaller.

Both tables are fixed to EUR/USD on a USD account. For your own pair, lot size and account currency, the pip calculator that prices one pip, a 1-pip spread and a 20-pip move runs the same arithmetic from the instrument you pick and the rate you supply.

Going from a risk budget to lots

You never pick the lot size first. You pick the money you are willing to lose, then the distance to your stop, and the lot count falls out of dividing one by the other. Take a 5,000 USD account, risking 1% (50.00 USD), buying EUR/USD with a stop 25 pips away, a 1-pip spread, and commission of 7 USD per standard lot round turn (which is 0.07 USD per micro lot). The broker deals in 0.01-lot steps, so one micro lot at a time.

1. Effective stop distance: 25 pips + 1 pip of spread = 26 pips.
2. Loss per micro lot: 26 x 0.10 = 2.60 USD.
3. Add commission: 2.60 + 0.07 = 2.67 USD per micro lot at the stop.
4. Micro lots: 50.00 / 2.67 = 18.73.
5. Round down: 18 micro lots = 18,000 units = 0.18 standard lots.
6. Check the worst case: 18 x 2.67 = 48.06 USD. Inside the 50.00 budget.

The shortcut answer — 50.00 divided by 25 pips of 0.10 each — lands neatly on 20 micro lots, and it overshoots the budget by nearly 7%. On a small account that difference compounds fast, because the fixed commission is a bigger slice of a small budget than of a large one. The full forex sizing walkthrough covers the same effect on a standard lot.

The forex position size calculator runs these six steps from a stop distance typed in pips, and gives the answer in units and in lots at the same time, with the lot step shown alongside.

Why the lot size alone never tells you the risk

Someone trading 1 standard lot is not automatically risking more than someone trading 10 micro lots — those are the same unit count. Risk depends on where the stop is. A standard lot with a 5-pip stop risks 50 USD plus fees; a standard lot with a 100-pip stop risks 1,000 USD plus fees. Same size, twenty times the risk.

This is also why "what lot size should a beginner use" has no single answer. The question only exists once you say how much you intend to lose and where the trade is wrong.

• Ask "units", not "lots". Lots are a broker convention; units are what the arithmetic runs on. Converting early removes a class of errors.
• Check your broker's step before you trust a number. If the minimum step is 0.10 lots, a computed size of 0.18 has to round down to 0.10, and the position is nearly half of what you planned.
• Small accounts are not stuck forever. Micro lots exist precisely so that a small budget can still be expressed accurately. Under-risking by rounding to whole lots is its own mistake.
• Contract specifications differ outside spot forex. Crypto futures and stock CFDs have their own contract sizes and tick values; the lot table above does not transfer to them. The crypto futures guide covers that side.

Compute it once, then let a tool do it

Run through the six steps above on your next trade and compare the answer to what your platform accepts. Once they match, you have confirmed both your pip value and your broker's step. After that there is no reason to do the arithmetic by hand each time.

The forex lot size calculator does the same job from the other end: you type a lot count and it reads back the units, the notional and the margin at your leverage, or you type the money at risk and the stop distance and it reads back the lot count — on any of the 67 forex pairs in the reference data, with each pair's contract size and minimum step taken from its own specification row rather than from the pair you happened to trade last.

Open the position size calculator

Questions traders ask

Unit counts, nothing more: 100,000, 10,000, 1,000 and 100 units of the base currency. Whether your platform asks for lots or units it is asking the same question, because risk is always calculated on units. Some brokers do not offer every size, and the minimum step tells you what increments they accept.

On a USD account trading a USD-quoted pair like EUR/USD: 10.00 per pip on a standard lot, 1.00 on a mini, 0.10 on a micro, 0.01 on a nano. On JPY pairs a pip is 0.01 of price rather than 0.0001, so the figures arrive in yen and have to be converted — at 150.00 a standard lot is 1,000 JPY, or 6.67 USD.

Work out the loss one lot takes if the stop is hit, then divide the budget by that. On the worked example here a 26-pip distance costs 2.60 USD per micro lot, plus 0.07 commission: 2.67. A 50.00 budget divided by 2.67 gives 18 micro lots — 0.18 standard — and costs 48.06 at the stop.

Because the lot only says how many units you hold, not how far the stop is. One micro lot at a 10-pip stop risks 1.00; the same micro lot at a 100-pip stop risks 10.00. A lot size quoted without a stop distance attached tells you nothing about what the trade can cost you.

Usually account currency. The pip arrives in the quote currency first and only becomes yours once a conversion is applied, which is why the same pair can be quoted at noticeably different values per lot. Cross-check the account currency before comparing figures with anyone else's.

Related guides

• How to calculate position size in forex — the four inputs and the full formula.
• Leverage, margin and position size — three different things that get mistaken for each other.
• How much should you risk per trade? — the arithmetic behind choosing a percentage.
• Position sizing on a small account — when the step is bigger than your budget allows.
• Position sizing for gold (XAU/USD) — dollars, not pips, and 100 ounces to a contract.
• Position sizing for prop firm evaluations — daily loss limits and drawdown floors.