Rebound relationships run on borrowed emotional fuel. They begin fast, burn bright, and — because intimacy infrastructure takes time to build — often fail on a schedule that feels almost mathematical. This calculator makes that schedule explicit.
The core concept is emotional half-life: unprocessed attachment to a previous partner decays over time, and the decay constant depends on how long the prior relationship lasted versus how much genuine singlehood and reflection you banked before re-entering the market. A three-year relationship followed by three weeks of "healing" produces a very different curve than the same relationship followed by a year of therapy and bad haircuts.
Enter the prior relationship length, your gap, your self-awareness level, and the chemistry-to-compatibility ratio of the new connection. The output is an Expected Rebound Lifespan in days plus a Structural Instability Index that tells you whether this is a bridge relationship, a bandage, or against the odds, a building.
The formula
Y_prior- Duration of the dissolved relationship (years)
G_heal- Recovery gap of true singlehood before the new relationship (years)
EB- Emotional barometer — self-awareness and boundary skill (0–1)
SF- Sexual-focus ratio — raw attraction relative to emotional compatibility (0–2)
t_½- Emotional half-life of residual attachment to the ex
How it works, step by step
- Enter how long the previous relationship lasted — longer bonds leave longer-decaying residue.
- Enter the honest gap of actual singlehood (situationships don’t count) before the rebound began.
- Rate your current emotional self-awareness and the new relationship’s chemistry-vs-compatibility balance.
- The model derives your emotional half-life, then scales it by stability factors into an expected lifespan.
- Compare the lifespan against the 90-day and 1-year survival markers used in rebound research discussion.
Worked examples
Three weeks after a five-year relationship
Prior: 5 years, gap: 0.06 years, chemistry 9/10, alignment 3/10, self-awareness 4/10. Result: ≈ 69 days, instability 85/100 — Flash rebound, classified “Bandage.” The half-life math is unforgiving: five years of attachment decays slowly through three weeks of healing.
The year-later reconnection
Prior: 2 years, gap: 1.1 years, chemistry 6/10, alignment 8/10, self-awareness 8/10. Result: ≈ 468 days, instability 27/100 — Hybrid formation. A full healing gap relative to relationship length collapses the residual attachment term almost entirely.
How to read your score
Frequently asked questions
What officially counts as a rebound relationship?
A romantic relationship begun before emotional processing of the previous one is substantially complete. The calendar matters less than the ratio: this calculator keys on your healing gap relative to the prior relationship’s length, not absolute weeks.
Are rebound relationships always doomed?
No — and the model reflects that. High self-awareness, genuine goal alignment, and a chemistry-compatibility balance shift the curve dramatically. Research is genuinely mixed on rebounds; some studies find faster recovery and no worse outcomes.
What is emotional half-life?
It is this model’s decay metaphor: residual attachment to an ex diminishes by half over a characteristic period, which stretches with relationship length and shrinks with real healing time. It is a modeling device, not a clinical measurement.
Why does the chemistry-vs-compatibility slider matter so much?
Rebounds skew toward intensity because intensity anesthetizes grief. A relationship running primarily on spark inherits the volatility of the wound it is covering — hence the sexual-focus ratio’s heavy weight in the instability index.
Can this calculator tell me whether to end my relationship?
No. It estimates structural risk from self-reported inputs. Its healthiest use is as a conversation starter — with yourself or a therapist — about whether the relationship is a bandage, a bridge, or a building.
Is my relationship data private?
Completely. All computation happens in your browser; nothing is transmitted or stored.