Chapter 9: Calculator
Five interactive real-time calculators for RADIUS capacity, certificate lifecycle, VLAN sizing, deployment timeline, and MFA token cost
The following interactive calculators provide real-time sizing, planning, and cost estimation tools for identity authentication system deployments. Each calculator is designed to help architects, engineers, and procurement teams make data-driven decisions. All calculations update instantly as you adjust the input parameters, and results include visual gauges and breakdown tables for easy interpretation.
RADIUS Server Capacity Calculator
Calculates the required RADIUS authentication throughput (authentications per second) based on your user population, authentication frequency, and peak load factor. Results include server sizing recommendations and cluster configuration guidance.
Total number of endpoints requiring authentication
Time window for peak authentication load (e.g., morning login rush)
Percentage of users logging in during the peak window
EAP-TLS ≈ 4–6; PEAP ≈ 5–8; EAP-TTLS ≈ 4–6
Recommended: 30% minimum; 50% for critical environments
Required Throughput
—
authentications per second (auth/s)
Peak Auth/s (raw)
—
With Safety Margin
—
Recommended Nodes
—
Cluster Model
—
Load Level
010,000 auth/s
| Server Tier | Max auth/s | Status |
|---|---|---|
| Entry (500 auth/s) | 500 | — |
| Standard (2,000 auth/s) | 2,000 | — |
| Enterprise (10,000 auth/s) | 10,000 | — |
Certificate Lifecycle & Renewal Calculator
Calculates certificate renewal schedule, OCSP/CRL load, and PKI infrastructure sizing based on your certificate inventory. Helps plan automated renewal pipelines and CA capacity.
Total active certificates (user + device + server)
Recommended: 90–365 days; shorter = more secure but higher renewal load
Certificates renewed this many days before expiry
How often each authenticator checks OCSP for a cached cert
Daily Renewals Required
—
certificate renewals per day
Peak Renewal/Hour
—
OCSP Req/Second
—
Certs Expiring/Month
—
CA Tier Required
—
OCSP Responder Load
0500 req/s
| Metric | Value | Recommendation |
|---|---|---|
| Auto-renewal required? | — | SCEP/EST automation recommended if > 100/day |
| CRL size estimate | — | Delta CRL if > 1 MB; OCSP preferred |
| OCSP stapling benefit | — | Enable if OCSP req/s > 50 |
VLAN & IP Address Sizing Calculator
Calculates the required VLAN count, subnet sizes, and IP address space for your network identity authentication deployment. Covers employee, guest, IoT, quarantine, and management VLANs.
Total IP Addresses Required
—
addresses (including growth reserve)
| VLAN | Devices | Subnet | VLAN ID |
|---|---|---|---|
| Employee | — | — | 10 |
| Guest / BYOD | — | — | 20 |
| IoT / OT | — | — | 30 |
| Quarantine | — | — | 99 |
| Infrastructure | — | — | 100 |
| Management | — | — | 999 |
Deployment Timeline Estimator
Estimates the total project duration and phase breakdown for a network identity authentication deployment based on your organization size, complexity, and available resources.
Estimated Total Duration
—
weeks (calendar time)
Phase Timeline
| Phase | Duration | Key Deliverables |
|---|
MFA Token Cost & ROI Calculator
Compares the total cost of ownership (TCO) for different MFA token types and estimates the return on investment based on breach risk reduction. Includes hardware, software, support, and operational costs.
Admin users require FIDO2 hardware keys (phishing-resistant)
Lost, damaged, or decommissioned tokens per year
Industry average: 5–15% for enterprises without MFA
IBM 2024 average: $4.88M; adjust for your industry
3-Year ROI (FIDO2 Deployment)
—
return on investment over 3 years
| Token Type | Unit Cost | 3-Yr TCO | Risk Reduction |
|---|---|---|---|
| FIDO2 Hardware Key | $25–$55 | — | 99% |
| Smart Card (PIV) | $15–$30 + reader | — | 98% |
| TOTP Software App | $3–$8/user/yr | — | 92% |
| OTP Hardware Token | $20–$40 | — | 90% |
| SMS OTP (no hardware) | $0.01–$0.05/msg | — | 76% |
Annual Risk Exposure (no MFA)
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Annual Risk Saved (FIDO2)
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