Certificate Expiration Tracker Calculator
Plan SSL/TLS certificate lifecycle management: renewal workload, annual costs, risk scoring, and alert thresholds based on your certificate portfolio.
Inputs
Results
Renewals per year
20
Annual cert cost ($)
$1,300.00
≈ 10 pairs of sneakers
How to Use This Calculator
- Enter total certificates in your environment and their validity period (months).
- Select certificate type (DV, OV, EV, or internal CA) and enter wildcard certificates (%).
- Review annual renewals needed, certificates expiring in 30 and 90 days, and annual renewal hours.
- Automate renewal with ACME protocol (Let's Encrypt) or SCEP for internal PKI where possible.
- Set calendar alerts 60 days before expiration -- expired certs cause production outages.
How the result changes with Total certificates
| Total certificates | Renewals per year | Annual cert cost ($) |
|---|---|---|
| 1,001 | 1,001 | $65,050.00 |
| 3,501 | 3,501 | $227,550.00 |
| 6,500 | 6,500 | $422,500.00 |
| 9,000 | 9,000 | $585,000.00 |
What each input means
- Total certificates
- Number of SSL/TLS certificates across all domains and subdomains.
- Validity period (months)
- Certificate validity period. Let's Encrypt = 3 months, commercial = 12-24 months.
- Certificate type (0-3)
- 0 = Let's Encrypt (free, auto), 1 = Domain Validated ($50/yr), 2 = Org Validated ($200/yr), 3 = Extended Validation ($300/yr).
- Wildcard certificates (%)
- Percentage of certificates that are wildcards (*.domain.com). Wildcards cost ~2.5x more.
What each result means
- Renewals per year
- Total certificate renewal events you must handle annually.
- Expiring in 30 days
- Expected certificates expiring in any given 30-day window (evenly distributed).
- Expiring in 90 days
- Expected certificates expiring in any given 90-day window.
- Annual renewal effort (hrs)
- Staff hours per year for renewals (2 min automated, 30 min manual per renewal).
- Annual cert cost ($)
- Total annual certificate purchase/renewal cost.
- Expiration risk score
- 0-100 risk score. Higher = more risk of an unexpected expiration causing outage.
- Alert before expiry (days)
- Recommended number of days before expiration to trigger renewal alerts.
How this is calculated
Worked example, using the default values
- Identify Input Parameters4 parametersTotal certificates = 20, Validity period (months) = 12, Certificate type (0-3) = 1, Wildcard certificates (%) = 20 = 4 input(s) provided
- Calculate Renewals per yearRenewals per year = totalCerts * renewalsPerCertPerYear20 = 20
- Calculate Annual cert costAnnual cert cost = (standardCerts * baseCostPerCert) + (wildcardCerts * baseCostPerCert * wildca...1300 = $1,300
- Calculate Expiring in 30 daysExpiring in 30 days = ceil(renewalsPerMonth)2 = 2
- Calculate Expiring in 90 daysExpiring in 90 days = ceil(renewalsPerMonth * 3)5 = 5
Engine last updated .
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