The honest SaaS ROI calculator — bands, not single-number ROI.
P10 / P50 / P90 sensitivity bands using Forrester TEI methodology — 10% discount rate, 3-year horizon, and the 50% productivity-recapture rule Forrester itself uses (vendor calcs implicitly use 100%). Tier-jump SSO premium pulled live from ssopricing.com. No affiliate revenue.
Forrester's own research: customer outcomes 35-60% below TEI projections in Year 1
Every Forrester TEI study above is commissioned by the vendor whose product it measures. The headline ROI numbers (280-544% across the verified set) represent best-plausible outcomes — clean adoption, full productivity recapture, no tier-jump pain. Forrester's own follow-up research with TEI customers found realised outcomes 35-60% below the projections in Year 1.
Average AI user saves 5.4% of work hours (~2.2 hr/wk). Source: McKinsey: Economic potential of generative AI. Plus +1.1% US productivity gain from GenAI by H2 2024 — St. Louis Fed: Impact of Generative AI on Work Productivity. These are the sanity-check numbers against individual vendor TEIs.
Verified 2026-06-02 against 8 primary Forrester TEI studies.
What each category typically saves
Time-saved figures sourced from Forrester TEI studies — flagged below as vendor-commissioned where applicable. The 50% productivity-recapture rule is applied in the calculator above; raw mins-saved figures here are before recapture.
| Category | Mins/user/day | Cited ROI | Source | Status |
|---|---|---|---|---|
| CRM Sales pipeline, customer records, deal management | 5-30 | 200-354% | Salesforce for Manufacturing TEI (Forrester) | Vendor TEI |
| Project & work management Task management, docs, knowledge bases, coordination | 3-20 | 200-336% | Google Workspace TEI (Forrester) | Vendor TEI |
| HRIS & payroll HR information systems, payroll, onboarding, performance | 1-8 | 100-136% | Rippling TEI (Forrester) | Vendor TEI |
| Marketing automation Email, automation, content, CDP | 8-45 | 200-544% | Nucleus Research / IDC | Vendor TEI |
| AI assistants Copilot, embedded LLMs, AI agents | 5-40 | 50-116% | Microsoft 365 Copilot TEI (Forrester) | Vendor TEI |
| Communication & collaboration Messaging, video, calling, email | 3-25 | 150-350% | Slack for Marketing TEI (Forrester) | Vendor TEI |
| Analytics Product analytics, BI, dashboards | 15-120 | 200-354% | Mixpanel TEI (Forrester, April 2026) | Vendor TEI |
Verified 2026-06-02. 7 of 7 categories sourced from vendor-commissioned studies; flagged per row.
Seven categories, sourced
CRM
Project & work management
HRIS & payroll
Marketing automation
AI assistants
Communication & collaboration
Analytics
Every other SaaS ROI calculator is on a vendor's site
BetterCloud, Flexera, Keepit, Vendr, Zluri, Productiv, Sastrify, Tropic — each publishes a SaaS ROI calculator and each is funnel content for its own SaaS-management product. The independent calculators that rank (saasroi.pro, mdz.ai, saasbuffer) output a single ROI number with no methodology, no sensitivity, no acknowledgement of tier-jump SSO costs.
saasroicalculator.com does the opposite. Three honest bands instead of one inflated number. Forrester's own 50% recapture rule applied — not the 100% vendor calcs assume. Tier-jump SSO premium folded in via the live ssopricing.com dataset. Multi-year NPV with explicit 10% discount and Y2 escalation.
Plan for P50. Budget against P10. Stretch-target P90. Full methodology.
Why Rippling's 136% TEI is the most honest one we found
Of 8 Forrester TEI studies verified, the cited 3-year ROIs ranged from 116% (M365 Copilot) to 544% (HubSpot Marketing via Nucleus). The most credible figure in the set is Rippling at 136% — not because Rippling delivers less value, but because the methodology is tighter and the assumptions are more honest.
Read the implicit signal:when a vendor commissions a TEI and the headline ROI lands below 200%, the methodology is more defensible. When it lands above 400%, the productivity-recapture assumption is doing 80% of the work. Apply Forrester's own 50% recapture rule to any vendor TEI and the headline approximately halves.