Free tool

Microsoft 365 License Waste Calculator

In typical M365 tenants, 10–20% of paid licenses are effectively unused — inactive users, disabled accounts still holding seats, licensed shared mailboxes, and over-provisioned tiers. Estimate what that's costing you.

Licensed users: 250

Primary license type

Estimated waste rate: 15% (10–20% is typical; well-managed tenants run ~5%)

Monthly license spend

$9,000

Estimated waste / month

$1,350

Estimated waste / year

$16,200

Stop estimating — get the real number

SeatPrune connects to your tenant read-only and lists every wasted license by name, with the exact monthly cost. From $10/month flat — about $1,350 of estimated waste says it's worth five minutes.

Run a Real Audit — Free

Where the waste actually hides

→Inactive licensed users — no sign-in for 90+ days, still paying full price
→Disabled accounts that still hold licenses after offboarding
→Shared mailboxes under 50 GB paying for licenses they don't need
→E5 users whose activity fits an E3 profile — $21/user/month of gap
→License drift — the bill creeping up faster than headcount