Here are some very useful scripts to calculate account percentage to risk on each trade.

Copy them to your scripts folder and restart MT4. Go to scripts in the navigator and right-click to select Set Hot Keys. I suggest setting Open Short to CTRL Z, Open Long to CTRL C and Prepare stops to CTRL X. Then to place a trade press CTRL X, 2 pink lines will appear on your chart, double click to move them to where you want SL and TP. Then either CTRL Z for a short trade or CTRL C for a long trade, you will get the option to change risk percentages etc. The script will calculate the lot size based on your risk percentage, stop-loss and open the position.

If you wish to place a pending order start by pressing CTRL X twice (3 times will cancel it) a dashed Magents line will appear, move it to where you want the order to enter. Either limit or on stop does not matter it will work it out. Set stops as above and place long or short order.

1. [Open_Long].mq4 Downloaded 357 times 7.09 KiB
2. [Open_Short].mq4 Downloaded 362 times 7.01 KiB
3. [Prepare_Stops].mq4 Downloaded 339 times 3.04 KiB