When to use: Enter your own vendor-quoted prices (this tool doesn't assume specific software or pricing) for seat count, subscription price, perpetual license price, and annual maintenance rate to see total cost of ownership over time and the year subscription and perpetual licensing cross over.
This calculator models total cost of ownership for engineering software over multiple years under two common licensing structures — a recurring subscription and a one-time perpetual license plus annual maintenance — and finds the crossover year where one becomes cheaper than the other. It's software-agnostic: enter your own vendor-quoted prices for whatever CAD, simulation, PDM, or EDA tool you're evaluating.
A subscription model charges a recurring fee per seat per year, with no cost if you stop paying (and, typically, no further access to the software once you do). A perpetual license is a larger one-time purchase per seat that keeps working indefinitely, but most vendors bundle it with an optional (in practice, close to mandatory for ongoing updates and support) annual maintenance fee — commonly 15–20% of the license price per year. Over a long enough horizon, the perpetual model's cumulative cost grows more slowly (maintenance is a percentage of the smaller original license price, not the full subscription rate), so it eventually becomes cheaper — the question this calculator answers is simply: how many years does that take, given your actual quoted numbers.
Comparing only a single year's cost, or only a short 2–3 year total, systematically favors whichever model has the lower up-front cost (almost always subscription), while comparing only a very long horizon systematically favors perpetual — neither framing alone answers the real question, which is how long you actually expect to keep using this specific seat of software. If your team's software needs, headcount, or project pipeline are volatile, or you need to scale seats up and down often, subscription's flexibility (no large sunk cost, easy to reduce seats) often outweighs a longer-horizon cost advantage that perpetual licensing might show on paper. If you have stable, long-term seats you know you'll keep for 5+ years, the breakeven year this calculator reports is the number that actually matters for a build-vs-lease-style decision.
This is a licensing-cost model only. It does not include hardware costs (see the Hardware Requirements Calculator for that), IT administration overhead, or the cost of downtime during a license migration. It also doesn't model price increases over time — vendors periodically raise both subscription and maintenance rates, and perpetual license list prices tend to increase between major version releases, so a real multi-year forecast should apply a reasonable annual escalation percentage to both models if you have visibility into a vendor's historical pricing pattern, rather than assuming flat pricing indefinitely as this simplified model does.
Get your own vendor quotes — do not use example numbers from elsewhere, since engineering software pricing varies enormously by vendor, product tier, and negotiated volume discount. Enter seat count, the subscription price per seat per year, the perpetual license price per seat, the annual maintenance percentage (ask your vendor directly — it varies by product and sometimes by negotiated deal), and any one-time training or onboarding cost. Toggle whether the first year of maintenance is included free with a perpetual purchase, which many vendors do. The year-by-year table shows cumulative cost for both models; the highlighted breakeven year is where the perpetual line first drops below the subscription line.
This models the common real-world case where a company already has subscription access (already onboarded, staff already trained) and is evaluating whether to switch to perpetual, or is comparing a fresh subscription deployment against a fresh perpetual deployment where the training cost is genuinely a one-time event either way. If your specific comparison needs training costs on both sides (e.g., switching software entirely, not just licensing model), add an equivalent one-time cost to your subscription seat price for year 1 manually, since the calculator doesn't split training onto the subscription side by default.
Not necessarily — it depends entirely on the specific prices you enter, and some vendors deliberately price subscriptions close enough to perpetual+maintenance that the breakeven point is very far out (10+ years) or effectively never happens within a realistic planning horizon. This is precisely why the calculator computes a specific breakeven year from your real numbers rather than assuming a general rule — the actual crossover point varies enormously by vendor and product.
Yes — enter the actual net price you'd pay per seat after any volume, educational, or negotiated discount, not the public list price, since that's what actually determines your total cost. Many engineering software vendors negotiate meaningfully off list price for larger seat counts, and using list price here would overstate your real cost for both models (though it would still give a roughly correct breakeven year if the discount percentage is similar across models).
This calculator assumes a fixed seat count held for the entire time horizon, which favors subscription in practice for occasional-use seats, since subscriptions can typically be added or dropped between billing periods while perpetual licenses are a sunk cost regardless of utilization. If your actual usage is seasonal or project-based rather than a stable headcount, model the subscription cost at your realistic average seat-months per year rather than a full year-round count, while still comparing against the full perpetual price (since a perpetual license doesn't stop costing you once purchased, even if idle part of the year).
The same subscription-vs-perpetual math applies, but "seats" here should represent your floating license pool size (the number of concurrent users you're licensed for), not headcount — floating licenses are usually priced differently (often at a premium per seat over named-user licenses) precisely because they can be shared across more total users than the seat count, so get the correct floating-license pricing from your vendor rather than reusing a named-user quote.
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