Formula
Lock-up expiry date = IPO date + lock-up period in calendar days.
IPO Lock-up Expiry Calculator
Calculate the expiry date of an IPO lock-up period and show common 90, 180 and 270 day windows.
Worked example
For an IPO date of 2026-06-07 and a 180-day lock-up, the expiry date is 2026-12-04.
Professional note
Professional note: print the input values, formula, result and date together so the calculation can be reviewed later.
Regional and unit assumptions
Basis: transparent planning arithmetic using the visible inputs and assumptions on this page.
Assumptions and limitations
- This calculator is for planning and education, not legal, tax, medical, immigration, engineering or financial advice.
- Use current official rates, contracts, carrier terms, statutes or professional guidance before relying on the result.
- The default values are examples. Replace them with the figures from the job, invoice, contract, bill, service or record being checked.
Methodology & Accuracy
How this calculator is checked
CalculationTime pages are built around visible arithmetic: the formula, assumptions, worked example and practical limitations are shown so the result can be checked rather than simply trusted.
Formula used
Lock-up expiry date = IPO date + lock-up period in calendar days.
Standard or basis
Basis: transparent planning arithmetic using the visible inputs and assumptions on this page.
Where a calculator follows a named legal, trade or industry standard, that standard is cited visibly. Otherwise the page uses transparent general arithmetic and states its limits.Master's Tip
Professional note: print the input values, formula, result and date together so the calculation can be reviewed later.
Related calculators
Questions
What is the IPO Lock-up Expiry Calculator?
The IPO lock-up calculator adds the chosen lock-up period to the IPO date and displays the expected expiry date.
Can I rely on this as professional advice?
No. Use it as a transparent planning estimate, then verify the current rule, rate, contract or official source for the decision you are making.