Lot Size Calculator

What Is a Lot Size in Forex?

A lot is the unit forex is traded in. One standard lot is 100,000 units of the base currency, a mini lot is 10,000, a micro lot is 1,000 and a nano lot is 100. The lot you select decides what one pip of movement is worth, which is why the same price move produces a very different result on a micro lot than on a standard one.

Converting Between Lot Sizes

Each step down the scale divides by ten, which makes conversion arithmetic rather than lookup.

1 standard = 10 mini = 100 micro = 1,000 nano = 100,000 units

So 0.25 standard lots is 2.5 mini or 25 micro, and 40,000 units is 0.4 standard. The converter above moves between all five representations at once, which matters because platforms disagree: some accept 0.25 where others expect 25,000 units for the identical position.

Choosing a Lot Size on a Challenge Account

On a FundedFast challenge or funded account, both of which are simulated trading accounts, the maximum daily loss is 5% of your starting balance and the maximum total loss is 10% of your starting balance, raised to 20% where the drawdown add-on was purchased on an eligible account. Lot size is what connects a price move to that allowance: on a 50,000 account the 5% daily limit is 2,500, so a single standard lot with a 30-pip stop puts roughly 300 at stake, while five standard lots on the same stop puts 1,500 at stake, over half the day's allowance on one trade.