This Forex calculator provides you with a position size in standard lots based on the variables that you enter. The account currency field will correspond to the currency which you use in your trading account. So if you are based in the U.S., this will likely be USD, whereas if you reside in the UK, you would choose GBP. This position size calculator is a free tool that allows you to calculate the size of the position in units and lots. This will be very helpful to manage your risks more wisely as you will be more informed. This position size calculator works with all major currencies. It requires the minimum input values, but allows you to customise it according to your specific needs. All you have to do is complete the form below and then press the Calculate button.