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Backtesting & Statistics

How to Find Your Best Trading Day

Your best trading day is the trade log split by the weekday each trade was taken, five sums and five averages, each read with its wobble. This paper shows you the method in five lines; the idea as a chest of five drawers; the example rule's 135 real trades on the euro in 2026 by weekday, Tuesday and Thursday heavy, Wednesday and Friday light, every day inside every other day's wobble; the same trades dealt into the days at random a thousand times to see how large a best-day gap chance makes; and the weekday column built from the History export on your platform.

Difficulty
Advanced
Reading time
5 min
Pages
8
Reviewed by
Saman Rahbar

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The best day in five lines

Finding your best trading day is the trade log split by the day of the week each trade was taken, five sums and five averages. People ask because a Friday that lost three times in a row feels like a Friday problem. The method is a weekday column in the log, a sum and an average per day, and then the wobble per day, which is how far one trade typically strays from its average, divided by the square root of the count. What it can say is which day carried the total so far. The example rule on the euro through 2026, 27 trades on each weekday: Tuesday made 89.3 pips, where a pip is the fourth decimal place of the price, Thursday 85.7, Monday 7.7, Friday lost 10.0 and Wednesday 22.4, each with a wobble of about five pips a trade.

A chest of five drawers

Picture a chest of five drawers, one per weekday. Every trade goes in the drawer of the day it was taken, and then each drawer is weighed: the same 135 receipts as the log, 27 in each drawer. Two drawers are heavy, Tuesday and Thursday; two are light, Wednesday and Friday; Monday is nearly empty. The best day is the heaviest drawer. Whether it is a real best day is a different question, because 27 receipts is few, and the honest reading weighs each drawer against how much 27 receipts of this size could vary by chance, which is the next drawing.

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