Lot Size Calculator
Your lot size is your position size expressed the forex way: standard lots (100,000 units), mini lots (10,000), and micro lots (1,000). Enter your risk parameters above to get all three instantly.
Results
Fill in the inputs to see your results.
Understanding lot sizes
Forex is traded in fixed blocks of currency. One standard lot is 100,000 units of the base currency; mini lots are 10,000 and micro lots 1,000. On EUR/USD each pip moves $10, $1, and $0.10 respectively — so the lot you choose directly scales your risk per pip of movement.
Most retail traders should think in micro and mini lots: on a $5,000 account risking 1% with a 25-pip stop, the correct size is 0.20 standard lots — displayed above as 2 mini lots or 20 micro lots, whichever your broker's platform speaks.
Lot size versus leverage
Lot size and leverage are independent. Leverage only determines the margin your broker locks up; lot size determines your actual profit and loss per pip. A 0.10 lot position has identical risk at 1:10 and 1:500 leverage — the stop loss and lot size alone define what you can lose.
Frequently asked questions
What lot size should I use with a $1,000 account?
At 1% risk ($10) it depends entirely on your stop: a 10-pip stop allows 0.10 standard lots, a 50-pip stop only 0.02. Enter your actual stop distance above — there is no correct lot size without it.
What is the difference between lot size and position size?
They are the same thing in different units. Position size is measured in currency units; lot size expresses it in standard (100k), mini (10k), or micro (1k) blocks. This calculator shows both.
Can I trade fractional lots?
Most brokers support 0.01 lot (one micro lot) increments, and many allow finer sizing. Round the calculator's result down to your broker's smallest increment to stay within your risk limit.