Records
Save each person’s date, time, place and settings separately. Do not replace missing time with a confident house claim.
A compatibility result needs three labels
Question
Name one comparison question before reading the output, such as a selected pair of placements or a stated timing question.
Scope
Describe the calculation as an interpretive comparison, not evidence of consent, safety, commitment or personal worth.
This page’s original contribution is the three-label compatibility record. It separates source data, the question being asked and the scope of the answer so a generated score cannot silently stand in for all three.
Keep chart comparison and lived decisions apart
A relationship includes communication, consent, safety, circumstances and choice. None of those can be established by an astrology calculator. Use a chart comparison as a reflection prompt only after the records and question are clear.
For a two-chart workflow, see the synastry chart calculator guide. For a single base-chart reading, use the star-chart reading order.
To preserve a clear sign-result receipt before comparing two records, use the zodiac calculator guide.
When one birth time is unknown
Keep time-sensitive angles and houses unresolved for that person. You can record date-stable information, but do not let a default time manufacture precision in a comparison.
Use the free birth chart calculator guide for a record-based scope check, or the find-my-birth-chart checklist before comparing two inputs.
Astrology compatibility calculator questions
Can a compatibility calculator predict whether we will stay together?
No. It can display a selected chart comparison under stated settings, not make a reliable relationship forecast.
Do I need two exact birth times?
Exact times support time-sensitive comparisons. Without them, preserve the limitation and leave relevant angles and houses unresolved.
Is compatibility the same as a composite chart?
No. A composite chart uses a separate construction; a compatibility comparison should state which method it is using.
What should I save?
Save both input records, visible settings, the selected comparison and the exact question.