Consistency Rule in Evaluations: How It Is Measured
Best day divided by total profit sounds simple. Ten made-up days, read three ways, show why the share can pass 100% and why a losing day raises it.
3 Nov 2026 · 5 min read
On this page
A consistency rule limits how much of your total profit may come from a single day, and some rulebooks count a single trade instead. It is measured as a share: the best day's profit divided by total profit over the period the rule covers, compared with a set percentage. Which profit goes on the bottom, what counts as a day and what the percentage is all differ between firms, so this page works one made-up list through the common readings. It names no firm and quotes no firm's threshold.
The formula
Share = best day ÷ total profit. Both are in account currency, so the size of the account drops out: only the shape of the days matters. A rule then says the share must stay at or under a set percentage, or states a consequence when it does not. The consequence is in the rulebook and varies, so read yours for it.
Ten days, made-up inputs
Daily results for an evaluation, in account currency: +300, +150, −200, +900, +100, −350, +250, +400, −100, +200. Day 4 had three trades: +500, +600, −200. These are made-up inputs, not anyone's results. The table keeps a running total and shows the share after each day.
| After day | Day result | Total so far | Best day so far | Share of total |
|---|---|---|---|---|
| 1 | +300 | +300 | 300 | 100.0% |
| 2 | +150 | +450 | 300 | 66.7% |
| 3 | −200 | +250 | 300 | 120.0% |
| 4 | +900 | +1,150 | 900 | 78.3% |
| 5 | +100 | +1,250 | 900 | 72.0% |
| 6 | −350 | +900 | 900 | 100.0% |
| 7 | +250 | +1,150 | 900 | 78.3% |
| 8 | +400 | +1,550 | 900 | 58.1% |
| 9 | −100 | +1,450 | 900 | 62.1% |
| 10 | +200 | +1,650 | 900 | 54.5% |
- It can pass 100%. After day 3 the total is +250 and the best day is 300, so the share is 120.0%. When losing days pull the total below the best day, the best day is more than all of the profit.
- A losing day raises it. Day 6 lost 350. The share went from 72.0% to 100.0% although nothing about the best day changed, because the total fell.
- Profit on other days lowers it. The best day stays at 900; the total reaches 1,650 by day 10, and the share ends at 54.5%.
- It is not a measure of risk. It says nothing about how much was risked on any day, only how the profit was distributed.
Same days, three definitions
The final share depends on what goes on the top and the bottom. The line used here, 45%, is illustrative and not any firm's.
| Definition | Sum | Share | Against 45% |
|---|---|---|---|
| Best day over net total | 900 over 1,650 | 54.5% | over |
| Best day over winning days only | 900 over 2,300 | 39.1% | under |
| Best single trade over net total | 600 over 1,650 | 36.4% | under |
One list of days is over the line under one definition and under it under the other two. That is why a threshold remembered from another firm's rule says little about yours: the same trades can sit on either side.
What else changes the reading
- What a day is. The reset time and timezone decide which trades belong to which day, and whether a day counts closed results only or includes floating profit at the day's end.
- Which period. Since the account began, since the last phase began, or over a rolling window. The bottom of the fraction is the profit over that period only.
- Whether losing days stay in the total. The second row of the table above leaves them out; the first keeps them in.
- Whether the rule exists at all. Not every rulebook has one, and those that do word it their own way.
- Size drops out of a share. If the same ten days are repeated onto a second account at half the size, the figures halve and the share is still 54.5%. A rule counted in money, not as a share, would give each account its own figure.
Read your own rulebook
The percentage, the period, the definition and the consequence are in the firm's own rulebook. The prop-firm rules directory links to each firm's own site and covers copying, account totals and platforms rather than consistency rules today, so take this one from the source and note the date you read it. For the loss limits that sit beside it, see daily loss and trailing drawdown, explained, and for the daily rows to keep, a journal for evaluations. This page is arithmetic on made-up inputs, not advice.
Where a journal fits
We're working on a free journal and a backtester, with no date yet. Today Trepeat is a trade copier for MT4, MT5 and cTrader, currently on demo accounts, and you can add notes, a grade and screenshots to any copied trade once it closes, with a calendar of your results.
The calendar shows each day's result for the trades you have written an entry for, so it matches your account's day only if every trade has one. The Excel (.xlsx) export carries each entry's result and trade time. Trepeat does not read your firm's rules or work out a share, so the sums above are yours to run from your account statement. Details are in the journal documentation.
Written by the Trepeat team.