Subscription Cost Calculator
A subscription cost calculator works out what a per-seat SaaS subscription really costs over time. Enter the price, seats, any annual-billing discount and expected growth to see your monthly, annual and 3-year spend.
Many vendors give ~2 months free for paying yearly.
At a glance
How the subscription cost calculator works
- 1 Enter the per-seat monthly price and how many seats you need.
- 2 Add the annual-billing discount (many vendors give ~2 months free for paying yearly).
- 3 Set expected seat growth so the 3-year figure reflects your team scaling.
- 4 See monthly, discounted annual, and 3-year totals — plus what annual billing saves.
Monthly = Price × Seats. Annual = Monthly × 12 × (1 − discount%). 3-year cost compounds seat growth each year.
Worked example
A 35-seat team is quoted 18 per seat per month. The vendor offers 15% off for paying annually, and the team expects to grow about 10% a year.
- ·Price per seat per month: 18
- ·Seats: 35
- ·Annual prepay discount: 15%
- ·Expected seat growth: 10% a year
- 1. Monthly bill = 18 × 35 = 630
- 2. Twelve months at list = 630 × 12 = 7,560
- 3. Annual prepay = 7,560 × 0.85 = 6,426
- 4. First-year saving = 7,560 − 6,426 = 1,134
- 5. Three years, with seats growing 10% a year, = 21,270
Monthly 630, annual prepay 6,426 (saving 1,134), three-year cost 21,270.
The 1,134 discount is the easy part. The three-year figure is the one people get wrong, because seat growth compounds against the per-seat price: 10% growth adds roughly 2,000 over three years, nearly double the discount you negotiated. If headcount is going to rise, the discount worth chasing is a price band or a seat cap, not a percentage off this year.
Frequently asked questions
How much do you save with annual billing?
Most SaaS vendors offer 10–20% off for annual billing — often framed as "2 months free". On a $15/seat plan for 20 seats, a 17% discount saves roughly $600 per year.
How do I budget for subscription growth?
Project seat growth (new hires, expansion) year over year. This calculator compounds your growth rate across three years so your budget reflects scaling rather than today's headcount.
What is per-seat pricing?
Per-seat (or per-user) pricing charges a fixed amount for each person who uses the software. Total cost = price per seat × number of seats × billing period.
Monthly vs annual billing — which is better?
Annual billing is cheaper if you're confident in the tool and your seat count is stable. Monthly billing costs more but keeps flexibility if you might churn or change tools.
Is paying annually always cheaper?
Cheaper on paper, not always better. A 15 to 20% discount is a good return on money you were going to spend anyway. But annual prepay removes your ability to cut seats mid-year, and if the tool disappoints you have paid for the whole trial. For a first year with an unproven vendor the flexibility is often worth more than the discount; for a renewal of something the team already relies on, take the discount.
How should I forecast seat growth?
From your hiring plan, not from last year. Per-seat pricing scales with headcount, so a 20% growth year raises the bill 20% before any price increase. Ask the vendor what happens when you cross a tier boundary, and whether seats can be reduced at renewal — many contracts let you add seats freely but not remove them.
What is the difference between a seat and an active user?
A seat is what you pay for; an active user is someone who logs in. The gap between them is the most common source of waste in SaaS spend, and it grows quietly as people leave or change roles. Before renewing, compare paid seats against the vendor last-90-days active count — reclaiming unused seats usually beats any discount you could negotiate.
Should the calculator include price increases?
This one deliberately does not, because vendor increases are contractual rather than predictable. Treat the three-year figure as a floor and read your contract for the uplift clause: an annual rise capped at CPI is very different from one at the vendor discretion. If the clause is open-ended, add 5 to 7% a year to the projection before taking it to a budget meeting.