Who supplies which number

A broker is where the constants in your sums come from — Pakistan

Position sizing is arithmetic on numbers nobody invents at the keyboard. Some are typed by you, some are written by the market, and the rest are published by the company whose ticket you are using. Sorting them stops a borrowed figure from quietly ruining a correct calculation.

A broker is the company that gives access to the market, holds the account and publishes the specification for every symbol on it: how many units are in one lot, the smallest size accepted and the step above it, the leverage figure attached to the account, the overnight charge, and whether a commission applies. Those are the constants your sums multiply and divide by. The price is not one of them — the market writes that — and neither is the size, which you type.

Three sources, one calculation

Figure	Who fixes it	Where to read it
Units in one lot	The contract	The symbol specification on the platform
Smallest size and step	The broker	The same specification, next to the volume field
Leverage figure	The broker, per account	Account details in the client area
Overnight charge	The broker, per symbol and side	The specification, quoted separately for buy and sell
Commission, if any	The broker, per account type	The account type's own page: $0 on several, elsewhere per side and per lot
Price and spread	The market, through the platform	The two quotes on the ticket, right now
Size in lots	You	Typed into the volume field

Five constants, one live quote, one decision. Every number this site works out is some combination of those seven, which is why the first job on a new account is copying the first five down.

Why a borrowed constant is the expensive mistake

Arithmetic is forgiving about who does it and unforgiving about what goes in. A pip value copied from a currency pair and used on a metal, or a leverage figure taken from a page instead of from your own account details, produces an answer that looks finished and is wrong by a multiple rather than by a rounding error.

The habit that prevents it is short: never use a constant you have not read on your own screen. A specification window takes seconds to open, and it settles units per lot, the smallest size, the step, the currency the result prints in and the overnight lines at once. The collection sheet lists what to copy; the slips page shows what each wrong constant does to the answer.

What the company also does, outside the arithmetic

Exness is a broker founded in 2008, offering access to 100+ instruments through MetaTrader 4, MetaTrader 5, the browser-based Exness Terminal and the Exness Trade app, with support available 24/7. Those facts matter for choosing where to trade; none of them appears in a sizing calculation. This site keeps the two apart on purpose — one is a decision about a company, the other is a division.

Four figures no broker can supply

The amount you should risk. It is a fact about your budget, not about the company.
Where the stop belongs. The platform will accept any distance you type, including a bad one.
What the price will do. Quotes are reported, never promised.
Whether the trade is worth taking. No specification window answers that, and no calculation on this site does either.

Which constant changes most often?

The overnight charge — it is quoted per symbol and per side, and it can be revised. Read it on the day the position is meant to stay open.

Is units-per-lot the same on every instrument?

No, and assuming it is the fastest way to a wrong pip value. Contract size is set per symbol.

Does the broker decide my leverage or do I?

The figure available is set by the broker and shown in the account details; how much of it your size actually uses is decided by you.

Where is the commission in the sums?

It is not inside them. It is a separate line, $0 on several account types and quoted per side per lot where it applies — so a round turn counts two sides.

Can the same symbol have different constants on two accounts?

The contract figures hold; the account-level ones — leverage, commission, the currency the result prints in — are what differ. That page covers which.

Who fixes the spread?

It is the gap between the two live quotes rather than a published constant, so it moves during the session. Read it at the moment you plan to trade.

Is any of this readable before an account exists?

Yes. A free demo shows the same specification windows, which makes it the cheapest place to collect constants.

Does an independent guide hold money or open accounts?

No. This site writes about the broker and speaks for nobody: accounts and orders live on the broker's own site.

Where each constant gets used

Units per lot

The first multiplication, and the reason one size costs different amounts.

See contract size

The leverage figure

The single divisor behind the amount fenced off.

Read the sizing page

Smallest size and step

Where a calculated size gets rounded, or refused.

Run the division

Collect the constants on virtual money first.

A free demo opens the same specification windows, with nothing to send and no time limit.

Open a free demo at Exness