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Buy vs Subscribe Software Calculator

See when buying beats subscribing.

How it is calculated

The tool totals the subscription over your planned use and sets it against the one-off licence: subscription total = monthly fee × months and difference = licence cost − subscription total. Licence cost and monthly fee are in dollars, months is how long you expect to use the software. Read the sign of the difference carefully: a positive number means the licence costs more than subscribing for that long, so subscribing is cheaper; a negative number (shown with a minus sign) means the licence is cheaper. The comparison is a straight sum of two prices. It has no field for annual maintenance or upgrade fees, price rises, discounts or the resale of a licence, and it does not output a break-even month, although you can find it yourself as licence cost ÷ monthly fee. Negative or empty values return no result.

Worked example

A design tool costs $600 as a perpetual licence or $20 per month as a subscription, and you expect to use it for 36 months. Subscription total: 20 × 36 = $720.00. Difference: 600 − 720 = -$120.00, so buying is $120 cheaper over three years. The break-even is 600 ÷ 20 = 30 months; at 24 months the same inputs give +$120.00, meaning subscribing would still be the cheaper choice.

Try this example →

Common mistakes

  • Getting the sign wrong. A minus on the difference means the licence is cheaper, not that you lose money; a plus means the subscription is cheaper.
  • Entering the annual subscription price in the monthly field. The tool multiplies by months, so a yearly price would make the subscription look twelve times too expensive.
  • Ignoring costs the tool leaves out, such as paid major upgrades for a perpetual licence or support fees. Add them to the licence cost yourself.
  • Entering the time you might use the software rather than the time you will. If a project ends early or the tool is replaced, the shorter horizon can reverse the answer.

About this calculator

Software vendors increasingly offer a choice between a one-time perpetual license and an ongoing subscription (SaaS) plan, and the cheaper option flips depending on how long you plan to use the tool. This calculator compares the two paths — the upfront license fee versus the monthly subscription fee multiplied by the number of months you plan to use the tool. It shows the total subscription cost and how much it differs from the license price; maintenance or upgrade fees are not included, and to find the break-even point you can try different month counts.

Businesses and freelancers use this comparison when budgeting for design tools, accounting software, CRMs, or creative suites, since the 'right' answer depends on usage horizon: short-term or uncertain needs usually favor a subscription's flexibility and included updates, while long-term, stable use often favors a one-time purchase. Feeding in your specific prices and expected time horizon turns a vendor's marketing pitch into an apples-to-apples cost comparison.

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