Personal finance learning tool
Legal Retainer Depletion Calculator
Estimate how long a legal retainer lasts under projected fees, costs and replenishment.
Inputs and results stay in this browser. Currency symbols are illustrative; use any consistent currency.
Understand Legal Retainer Depletion
One idea, three depths
Choose how deeply to explain Legal Retainer Depletion
Legal Retainer Depletion: Estimate how long a legal retainer lasts under projected fees, costs and replenishment.
Age 5Explain it to a 5-year-oldStart with a picture
Imagine using Legal Retainer Depletion to answer this question: estimate how long a legal retainer lasts under projected fees, costs and replenishment? Enter Current legal retainer balance, Projected monthly attorney and staff fees, Projected monthly external case costs, and 2 other inputs; the calculator shows Estimated retainer runway months. Try changing one number and watch what happens to Estimated retainer runway months. The answer tells you Estimated retainer runway months.
Age 15Explain it to a 15-year-oldConnect it to the formula
Planning only: trust-account handling, replenishment, earned fees and refunds follow the engagement agreement. The rule is Retainer months = usable retainer balance ÷ net monthly legal-cost burn. Its input values are Current legal retainer balance, Projected monthly attorney and staff fees, Projected monthly external case costs, Expected monthly retainer replenishment, Minimum balance to preserve, and the main result is Estimated retainer runway months. Try changing one number and watch what happens to Estimated retainer runway months.
CollegeExplain it at college levelState the model precisely
This calculator evaluates a personal-finance model from stated cash amounts, rates and time assumptions. The implemented relation is Retainer months = usable retainer balance ÷ net monthly legal-cost burn, evaluated from Current legal retainer balance, Projected monthly attorney and staff fees, Projected monthly external case costs, Expected monthly retainer replenishment, Minimum balance to preserve to produce Estimated retainer runway months. Planning only: trust-account handling, replenishment, earned fees and refunds follow the engagement agreement. The result cannot predict markets or include unentered taxes, fees, legal rules, benefits, insurance terms or personal circumstances. Verify material decisions against current documents.
What this personal finance tool does
Estimate how long a legal retainer lasts under projected fees, costs and replenishment.
Why the relationship works
Planning only: trust-account handling, replenishment, earned fees and refunds follow the engagement agreement.
The formula
Retainer months = usable retainer balance ÷ net monthly legal-cost burn
Inputs and time periods
This model uses Current legal retainer balance, Projected monthly attorney and staff fees, Projected monthly external case costs, Expected monthly retainer replenishment, Minimum balance to preserve. Keep currencies and time periods consistent, and distinguish current known amounts from assumptions about future rates.
What the result means
The primary output is Estimated retainer runway months; supporting outputs include Net projected monthly legal-cost burn, Usable retainer above preserved balance. Compare scenarios by changing one input at a time.
Limits of this compact model
This educational calculator cannot predict markets or account for every tax, fee, legal rule, benefit, insurance policy or personal circumstance. Verify material decisions with current documents and qualified advice.
Supporting sourcesAcademic referencesPrimary standards, textbooks and complete citations
Standards, reading and academic references
Use the calculator as the worked interaction, then consult the primary standards and academic textbooks listed below. MW SysArc links to the original sources; the explanation on this page is original and does not reproduce them.
Principles of Finance
Read the free OpenStax finance textbookCite this book
- APA 7
- Dahlquist, J., & Knight, R. (2022). Principles of finance. OpenStax. https://openstax.org/books/principles-finance/pages/1-why-it-matters
- MLA 9
- Dahlquist, Julie, and Rainford Knight. Principles of Finance. OpenStax, 2022, https://openstax.org/books/principles-finance/pages/1-why-it-matters.
- Chicago author-date
- Dahlquist, Julie, and Rainford Knight. 2022. Principles of Finance. Houston, TX: OpenStax. https://openstax.org/books/principles-finance/pages/1-why-it-matters.
OpenStax entries are free to read online. Follow the licence shown on each linked source before redistributing or adapting its content.
Reuse the page responsiblyCite this pageAPA, MLA, Chicago, Harvard, BibTeX and RIS
These formats cite this calculator page itself. They are separate from the academic references above, which support the mathematical method and terminology.
APA 7
MW SysArc. (2026, July 21). Legal Retainer Depletion Calculator. MW SysArc Tools. https://finance.mwsysarc.com/legal-retainer-depletion
MLA 9
MW SysArc. “Legal Retainer Depletion Calculator.” MW SysArc Tools, 21 July 2026, https://finance.mwsysarc.com/legal-retainer-depletion. Accessed 31 Aug. 2026.
Chicago 17
MW SysArc. “Legal Retainer Depletion Calculator.” MW SysArc Tools. Published July 21, 2026. Accessed August 31, 2026. https://finance.mwsysarc.com/legal-retainer-depletion.
Harvard
MW SysArc (2026) ‘Legal Retainer Depletion Calculator’, MW SysArc Tools. Published 21 July 2026. Available at: https://finance.mwsysarc.com/legal-retainer-depletion (Accessed: 31 August 2026).
BibTeX and RIS records
BibTeX
@misc{mwsysarc_legal_retainer_depletion_2026,
author = {{MW SysArc}},
title = {Legal Retainer Depletion Calculator},
howpublished = {MW SysArc Tools},
year = {2026},
url = {https://finance.mwsysarc.com/legal-retainer-depletion},
note = {Published July 21, 2026; accessed August 31, 2026}
}RIS
TY - ELEC
AU - MW SysArc
TI - Legal Retainer Depletion Calculator
T2 - MW SysArc Tools
PY - 2026
DA - 2026-07-21
Y2 - 2026-08-31
UR - https://finance.mwsysarc.com/legal-retainer-depletion
N1 - Published July 21, 2026
ER -Clear answers
Frequently asked questions
What does the Legal Retainer Depletion do?
Estimate how long a legal retainer lasts under projected fees, costs and replenishment.
How does the Legal Retainer Depletion work?
The calculator applies Retainer months = usable retainer balance ÷ net monthly legal-cost burn. Planning only: trust-account handling, replenishment, earned fees and refunds follow the engagement agreement.
What can I learn from the Legal Retainer Depletion?
You will connect Current legal retainer balance, Projected monthly attorney and staff fees, Projected monthly external case costs, Expected monthly retainer replenishment, Minimum balance to preserve to Estimated retainer runway months, then test how changing one assumption affects the financial decision.
Does MW SysArc receive or store what I enter?
No. The calculation runs locally in your browser. MW SysArc does not receive or store your calculation inputs.
How should I use the result?
Use the result as a planning reference, and review how income, expenses, irregular payments, rates and time periods were classified before making decisions.
Last reviewed . Calculations tested .