How to Read Day Master Strength: It Is Not a Score
How the month command, roots, support and drain combine to decide strength — and why two apps can reach different conclusions.
Direct answer
Day Master strength (身强身弱) describes how much the Day Master can carry within the whole chart. The usual order is the month command first, then roots in the branches, support in the stems, backing from resource and peer elements, and the drain and restraint coming from wealth, officer and output elements. It is not a percentage score, and stronger is not better.
01The month command is the starting point, not the only answer
The month command supplies the seasonal setting and usually carries the heaviest weight, but reading it alone misleads. Holding the season with no root at all, or losing the season while rooted deeply in the branches, both push the conclusion off course.
02Strength judgements need room for grey
Most charts do not land clearly strong or clearly weak; they sit near the middle. On these borderline charts a small methodological difference can flip the conclusion, which is where tools disagree most often.
03Strength is an input to later judgements, not the endpoint
Strength itself says nothing directly about fortune. It sets the direction of what follows: a weak chart tends to address carrying capacity first, a strong chart tends to address outlet and restraint first, and the Major Cycles (大运) can shift that emphasis later. Treating strength as the conclusion throws away everything after it.
04Use an evidence matrix instead of a single score
A more re-checkable approach is to list the supporting items and the draining items: what the month command gives, how many roots there are, how many stems lend support, and how much wealth, officer and output weigh. Even if a judgement follows, its grounds should be checkable line by line.
05Having a root does not mean being strong
Roots vary in depth and come as primary, middle or residual qi. A root only shows that support exists; you still have to ask whether a clash or combination has damaged it, and whether the draining side is heavier.
06Why software disagrees
Implementations differ mainly in the weight given to the month command, the weight given to hidden stems, whether the Day Master counts itself, and whether half-combinations and three-combinations are counted. These are checkable implementation choices, not someone calculating wrongly. We publish the conventions we use on our methodology page.
07Checklist
- Supporting and draining items were listed, not just a single verdict word
- The month command was read before roots, support and drain
- Primary, middle and residual roots were kept distinct
- Whether a combination or clash damaged a root was checked
- On borderline charts, the possibility of school disagreement was stated
Frequently Asked Questions
Are people with a strong Day Master more successful?
No. Strength only describes carrying capacity; success also depends on ability, opportunity and real conditions.
Two apps disagree on strength — which is right?
Usually the weights differ, not the arithmetic. Check the weight given to the month command, the weight of hidden stems and whether half-combinations count, then decide which convention matches the tradition you follow.
Can a weak Day Master never handle wealth?
Not necessarily. It also depends on how strong the wealth is, whether resource and peer elements lend support, and whether the cycles top up the carrying capacity.
Is there a standard strength formula?
No. Weights and thresholds differ between schools; a score is an internal implementation detail and cannot be compared across tools.
Does holding the month command mean being strong?
Not necessarily. Holding the season is only the heaviest single item; roots and the draining side still matter.
What is the difference between a following structure and ordinary weakness?
A following structure means the Day Master is extremely weak and complies with another force. Its judgement and direction of adjustment run opposite to ordinary weakness, and it is a configuration that is easily misread.
Related entries
- What Is the Day Master? Why Every Relationship Is Built Around the Day StemWhat makes the ten Day Masters different, and why the Day Master is a reference point rather than a personality label.
- Understanding the Useful God: It Is Not About Filling In What Is MissingWhat the useful god and favourable elements actually do, and why a missing element and a needed element are not the same thing.
- What Is Climate Adjustment? Why Cold, Heat, Dryness and Damp MatterHow climate adjustment reads the cold, heat, dryness and damp of the birth season — and how it differs from strength and useful-god analysis.
Updated 2026-09-20