SaaS ROI Calculator

Estimate the return on a software purchase from time saved or revenue gained, against its subscription and implementation cost.

Inputs

Revenue mode (use annual revenue increase instead of time saved)

When enabled, enter expected annual revenue increase from the tool; employee and hour fields are ignored.

Number of employees affected

Average hourly wage ($)

Hours saved per week (per employee)

Monthly SaaS cost ($)

Implementation cost ($)

Time horizon (years)

Methodology

Time mode: Annual value = employees × hourly wage × hours saved/week × 52. Total cost = (monthly × 12 × years) + implementation. ROI = [(total value − total cost) ÷ total cost] × 100. Payback period = implementation ÷ [(annual value ÷ 12) − monthly cost], i.e. months of net monthly benefit (after the ongoing subscription cost) needed to recover the one-time implementation cost. Chart shows first 5 years or your horizon, whichever is shorter.

How to use this for a purchase decision

Build one table: your assumptions (who is affected, hours or dollars), the annual value those assumptions produce, the all-in cost (license, services, and internal project time if material), and the resulting payback on the upfront implementation spend. Compare the result to doing nothing and to your next-best alternative.

Teams commonly overestimate time savings before adoption stabilizes. Consider cutting a first estimate by 30–50% for ramp-up and exceptions, or running a small pilot for one month and measuring actual hours before scaling the model to the full team.

If you're modeling cost savings (time already being spent) versus new revenue, keep the numerator consistent: use either fully loaded labor value or attributable revenue, not a mix of both, against the same total-cost denominator.

Limitations of this model

Assumes the entered wage, hours saved (or revenue increase), and subscription cost stay constant for the full time horizon.
Payback and ROI are only as reliable as the assumptions entered — a pilot-measured estimate is more defensible than a theoretical one.
Does not model contract-length discounts, usage-based pricing tiers, or mid-term price increases.

SaaS unit-economics tools

The calculator above models buyer-side ROI — the value a team gets from adopting a tool, versus what it costs. If you're evaluating a subscription business's own economics instead — acquisition cost, lifetime value, growth, and retention — use these related, distinct tools:

CAC vs LTV ROI — compare customer acquisition cost to lifetime value, LTV:CAC ratio, and payback period.
Subscription Growth ROI — project subscriber count and revenue under monthly growth and churn assumptions.
Time-to-Value ROI — estimate break-even from tool and implementation cost against a monthly efficiency gain.

Explore further

ROI calculator — the general-purpose version of this calculation.
SaaS ROI benchmarks — reference ranges for SaaS unit economics.
ROI comparisons — how ROI relates to IRR, NPV, and payback period.
CAC and LTV — term definitions used by the unit-economics tools above.