The accumulation calculator models how a compound's estimated activity builds over time when entries are repeated at regular intervals. Because compounds don't fully clear before the next entry, activity from prior intervals carries over and stacks — producing higher overall levels until the system reaches a stable pattern.
What Accumulation Means
Every compound has an estimated activity window — a period during which it remains active before declining. When a new entry occurs before the prior one has fully declined, the remaining activity from the previous entry overlaps with the new one. Over several intervals, this overlap compounds into higher sustained levels.
The accumulation calculator maps this buildup interval by interval, using each compound's estimated half-life to determine how much activity carries over.
Built-In Estimated Half-Life Values
The calculator includes built-in estimated half-life values for common research compounds. When you select a compound, the calculator auto-fills an estimated half-life so you can begin modeling immediately — no manual lookup required.
These values are research-based estimates. They provide a practical starting point for accumulation modeling and reflect typical activity patterns for each compound.
Custom Override
If you have a specific half-life value you want to model — or if you are working with a compound not covered by the built-in estimates — the calculator allows you to enter a custom value. The custom entry overrides the auto-filled estimate for that session.
This flexibility makes the calculator useful across a range of compounds and research setups without requiring a fixed database of values.
What the Calculator Estimates
After entering your compound, amount, interval frequency, and half-life (auto-filled or custom), the calculator returns three key estimates:
- Day-14 active estimate — the projected total active amount present at the 14-day mark based on your interval and carryover
- Peak overlap estimate — the highest estimated activity level reached across any single interval during the modeled period
- Steady-state estimate — the projected activity level once buildup stabilizes and carryover per interval equals clearance per interval
These outputs give you a view of both short-term buildup and long-term stability patterns across your research schedule.
Activity Curve Behavior
Compounds with shorter half-lives decline faster between intervals, producing less carryover and a lower steady-state level. Compounds with longer half-lives decline more slowly, carry more activity into the next interval, and accumulate to higher steady-state levels.
The activity curve shown by the calculator illustrates this pattern visually — rising during the accumulation phase and flattening as steady state approaches.
This Is an Estimation Model
All outputs from the accumulation calculator are estimates. They are based on half-life values and a mathematical decay model. Actual biological response varies between individuals and is not predicted or implied by any calculator output.
Use the accumulation calculator to understand patterns and plan research intervals — not as a precise measurement of biological activity.
Quick Reference
Accumulation occurs when new entries overlap with remaining activity from prior intervals
Built-in half-life estimates auto-fill when you select a compound
Custom half-life override is available for any compound
Calculator returns day-14 estimate, peak overlap estimate, and steady-state estimate
All outputs are estimates — actual biological response varies
Common Mistakes
These are mathematical estimates based on half-life decay models. Individual biological response is not reflected in the output.
Steady state typically requires multiple half-life cycles to approach. The calculator shows you the projected interval — review the full curve before drawing conclusions.
The auto-filled values are research-based starting points. Only override if you have a specific value to model. An inaccurate custom entry will shift all output estimates.
This guide is for research-use calculator education only. It does not provide medical advice, treatment recommendations, or personalized dosing instructions.