3-year cost calculator
Pre-filled for Fortinet FortiGate → OPNsense. Adjust every figure with your own numbers.
Every figure here is an illustrative estimate, not a vendor quote. Defaults are editable starting points compiled from public information; real, binding pricing comes from the vendor or an authorized distributor. See our methodology.
Recommended for your requirements: Recommended class: 1U mid-range (2–20 Gbps) — size to 10 Gbps NGFW (threat-protection) throughput and 3 Gbps TLS inspection (decryption reduces effective throughput ~50–70%), 2 Gbps IPSec VPN, ~2M concurrent sessions. Require: IPS, application control, URL filtering, anti-malware/sandboxing, and IPSec + SSL VPN.
All figures are illustrative and fully editable — adjust the cost-per-firewall and migration inputs with your own numbers. Not guaranteed vendor pricing (defaults reviewed May 2026). For a binding quote, use the request form below to reach an authorized distributor or partner.
Quick comparison: Fortinet FortiGate vs OPNsense
Common trade-offs teams weigh when staying on Fortinet FortiGate versus moving to OPNsense. These are general, commonly-reported considerations — not statements of fact about any vendor — so check them against your own contract and the vendors' current terms.
- Already in production — no migration effort or risk
- Mature ecosystem with vendor support and SLAs
- FortiGuard subscription bundles add up
- Per-appliance licensing across the fleet
- Feature unlocks require higher tiers
- Ongoing per-appliance + fortiguard cost to budget for
- Open source — no license fees
- No vendor lock-in
- Cost model: Free (open source)
- Requires a migration (~15 weeks, medium effort)
- Community support by default — paid support optional
Why teams evaluate alternatives to Fortinet FortiGate
Reasons commonly cited by users and in public industry coverage for re-evaluating Fortinet FortiGate. These are general, reported considerations — not statements of fact about Fortinet — and may not reflect your situation or the vendor's current terms. Verify against your own contract before deciding.
- FortiGuard subscription bundles add up
- Per-appliance licensing across the fleet
- Feature unlocks require higher tiers
The migration plan
Roughly 15 weeks for a mid-size estate, in six phases.
Tooling & automation
Translate FortiGate policies to OPNsense rules; migrate VPNs and Suricata signatures; stage and validate before per-site cutover.
OffVendor's wizard pre-fills these scripts with your environment — inventory export, disk/schema conversion, bulk provisioning, and validation.
Frequently asked
Is migrating from Fortinet FortiGate to OPNsense worth it?
For most teams facing rising Fortinet FortiGate costs, yes — OPNsense (free (open source)) typically lowers 3-year total cost of ownership, though the right answer depends on workload complexity and in-house skills. Use the calculator to model your own numbers.
How long does a Fortinet FortiGate to OPNsense migration take?
A typical mid-size estimate is around 15 weeks across six phases — discovery, design, pilot, waved production migration, validation, and decommission. Larger or more complex estates take longer.
What tools are used to migrate from Fortinet FortiGate to OPNsense?
Translate FortiGate policies to OPNsense rules; migrate VPNs and Suricata signatures; stage and validate before per-site cutover.