Lot size calculator for forex and gold signals

How the calculator works

It uses the formula from our position sizing guide: lots = money at risk ÷ (stop distance in pips × pip value of one lot in your account currency).

The money at risk is your balance times your risk percentage, or the amount you type. The stop distance comes from the signal: the gap between the entry and the stop loss, counted in pips. The pip value depends on the market and on your account currency, which is why the calculator converts at the day’s reference rate when the two differ, and shows you the rate it used.

The result is rounded down to the 0.01 lot step most brokers use. Rounding down keeps a full stop at or under your budget; rounding up would put every loss slightly over it.

A worked example

The values loaded on this page reproduce the first worked example in the sizing guide, so you can check the calculator against it by hand: a $5,000 account at 1% buying EUR/USD with a 25 pip stop comes out at 0.20 lots, with $50 at the stop, $50 at TP1 and $150 at TP3, before costs. Change any one input and watch which numbers move: the balance and the risk set the money, the stop and the pip value set the size.

Why the lot size changes with every signal

A fixed lot size is a changing risk. At 0.10 lots on EUR/USD, a 30 pip stop costs $30 and a 90 pip stop costs $90, on the same account and the same rule. Gold stops are often several times wider in pips than forex stops, so a trader who uses one lot size for everything takes the largest losses on the widest stops. Sizing each signal from its own stop makes every full stop cost about the same money.

What lot size for a small account

At 1% risk, here is what the formula returns for two example stops, a 25 pip stop on EUR/USD and an 80 pip stop on gold, with a dollar account.

Below 0.01 the trade does not fit the rule. The answer inside the rule is to skip that signal, or to take only signals whose stop fits at 0.01, and never to raise the risk rule to make the number fit. Wide gold stops make this sharper: gold stops of several hundred pips are common, and on a 500 pip stop even 0.01 lots risks $50, which is 1% of a $5,000 account. Below that balance, a stop that wide does not fit a 1% rule at all.

Using it with a signal

Paste the message as it arrived. The reader understands the common formats: labelled lines such as Entry Price, SL and TP1, one liners such as “EURUSD buy limit 1.0850 sl 1.0820 tp 1.0890”, entry zones, targets separated by slashes, broker suffixes like XAUUSD.m, and stops written in pips. It never invents a stop. If the message has none, it says so, and a signal without a stop is one to skip whoever sends it.

For an entry zone, the size is worked out from the edge of the zone furthest from the stop, so a fill anywhere inside the zone keeps the loss inside your budget. Check every field after reading a signal; formats vary and a careful glance costs nothing.

What the calculator leaves out

Spread, commission and swap. On a tight stop the spread is a real share of the risk: a 2 pip spread on a 20 pip stop is a tenth of it. Contract sizes also differ between brokers and account types, most of all on gold and on cent accounts, so check your broker’s contract specification once before trusting any lot size, ours included.

On Forexero signals

Our signals post one entry price, one stop and three targets, which is exactly what this calculator needs: paste the message and the size is done. Members who use the Cloud Copier can choose Risk % instead of a fixed lot, and the copier applies the same formula to every signal using its own stop. Every closed signal is on the results page with its stop and targets, losses included, if you want to test your sizing on real history first.

Questions

How do I calculate lot size in forex?

Multiply your balance by your risk per trade to get the money at risk, then divide it by the stop distance in pips times the pip value of one lot. On a $5,000 account at 1% with a 25 pip stop on EUR/USD: 50 ÷ (25 × 10) = 0.20 lots.

What lot size should I use on a $1,000 account?

At 1% risk, $10 a trade: 0.04 lots on a 25 pip EUR/USD stop, 0.01 lots on an 80 pip gold stop. The lot size comes from the stop, so no account size has a single right lot.

How much is one pip worth?

On one standard lot of a pair quoted in US dollars, such as EUR/USD or GBP/USD, $10. On gold, with one pip counted as $0.10 of price on a 100 ounce lot, also $10. On yen pairs it depends on the USD/JPY rate. The pip value calculator works it out for any pair and account currency.

Should I round the lot size up or down?

Down. Rounding down keeps a full stop at or below the risk you chose. Rounding up puts every loss slightly over budget, and that adds up across a losing streak.

Does it work for a prop firm or funded account?

Yes, the maths is the same. Funded accounts have a daily loss limit, so a lower risk per trade is usual there; the funded account guide works one out from the limit and covers the rules worth checking first.