Calculator
Enter key NDA dates and clauses. The layout automatically adapts: 3 columns on large screens, 2 on smaller, 1 on mobile.
Example Data Table
These sample scenarios illustrate common NDA setups and how term and survival interact.
| Scenario | Effective | Term | Renewals | Survival | Term End | Confidentiality End |
|---|---|---|---|---|---|---|
| Vendor evaluation | 2026-02-01 | 12 months | 0 | 24 months | 2027-02-01 | 2029-02-01 |
| Joint R&D | 2025-09-15 | 36 months | 1 × 12 months | 60 months | 2029-09-15 | 2034-09-15 |
| Trade secret focus | 2024-01-10 | 24 months | 0 | Perpetual | 2026-01-10 | Perpetual |
Formula Used
- BaseTermEnd = EndDate (fixed) or EffectiveDate + TermInterval (length).
- FinalTermEnd = BaseTermEnd + (RenewalCount × RenewalInterval) when renewals apply.
- LatestNoticeDate = FinalTermEnd − NoticeDays.
- ConfidentialityEnd = FinalTermEnd + SurvivalInterval (fixed survival), otherwise perpetual.
- DurationDays = day difference between two dates (calendar days).
How to Use This Calculator
- Enter the Effective Date from your agreement.
- Choose a Term Mode: fixed end date or a length from effective date.
- If your NDA renews automatically, enable Auto Renewal and set renewal details.
- Set the Non‑renewal Notice days to find the latest notice date.
- Select Survival Mode to model how long obligations persist after the term ends.
- Click Calculate. Results appear above the form.
- Use Download CSV or Download PDF for sharing and filing.
Term length sets the disclosure window
An NDA’s term defines how long the agreement is active for receiving confidential disclosures. Many commercial NDAs use 12–36 months, while project NDAs may run for the full engagement. Your document may start the term on the signature date, effective date, or last‑signature date—match your input to that definition. The term end is computed using calendar addition for years and months. For long negotiations, update inputs when the effective date shifts so end dates match the signed copy every time.
Renewals change the operational end date
Auto‑renewal provisions extend the term in blocks, such as 6‑month or 12‑month renewals. Enter renewal count and renewal months to model the final term end used for planning and governance. Example: a 24‑month base term plus two 12‑month renewals yields a 48‑month operational term. Results show both the base term end and the renewal‑adjusted end for traceability.
Notice periods drive action deadlines
When renewal is automatic, the notice period becomes a deadline that can be missed quietly. Typical non‑renewal notice windows range from 30 to 90 days. The calculator subtracts notice days from the final term end to produce the latest notice date. It uses calendar days; if your clause uses business days or special delivery rules, treat the output as a baseline and adjust for internal workflow.
Survival clauses extend confidentiality beyond term
Most NDAs keep confidentiality obligations alive after termination through a survival period, commonly 2–5 years. Some agreements use category‑based survival, such as three years for general information and perpetual for trade secrets. Selecting perpetual reports no fixed confidentiality end date; selecting fixed adds the survival interval to the final term end. For category clauses, run multiple scenarios and track the strictest requirement.
Practical records for audits and handoffs
A clean timeline helps with audits, renewals, and offboarding: effective date, term end, notice deadline, and confidentiality end. Exporting to CSV supports contract registers, and the PDF snapshot fits approval packets. Use the reference date to check status “as of” a meeting date, and note that negative remaining days indicate an already‑expired period. Attach the export with the relevant clause text and an internal contract ID.
FAQs
1) What is the difference between the term and the survival period?
The term governs when disclosures can be made under the agreement. The survival period governs how long confidentiality obligations continue after the term ends or the agreement terminates.
2) Can I use this for “X years after last disclosure” clauses?
Yes. Use the last disclosure date as the effective date for an approximation, then set the term or survival length to match the clause. For precise tracking, store last‑disclosure dates separately.
3) How do I handle mutual NDAs with different survival periods per party?
Run the calculator twice—once for each party’s obligation—using the same term inputs but different survival periods. Save both exports so reviewers can see each side’s confidentiality end date.
4) Does “perpetual” always mean forever?
Perpetual indicates no stated end date in the document. Enforceability can depend on jurisdiction and context. This tool treats it as having no fixed confidentiality end date for tracking purposes.
5) Why do I see negative remaining days?
Remaining days are calculated relative to the reference date. A negative number means the term or survival period already ended before that reference date, which is useful for retrospective audits.
6) What should I keep with the exported results?
Record the agreement name, parties, effective date source, and the clause text for term, renewal, notice, and survival. Attach the export to your contract record for faster future reviews.