← SaaS seat true-up calculator
Most SaaS renewals auto-renew the seat count from the last term, not the seat count actually in use. The gap between purchased and used seats is money spent every month whether anyone logs in or not — and it's the single most concrete number to bring into a renewal negotiation.
Open the free SaaS seat true-up calculator
Purchased is not used. A vendor's invoice bills the seat count on the contract, not the seat count logged into last week — the gap between the two is invisible until someone runs the audit.
Avoidable spend compounds by term. A monthly per-seat waste figure looks small; multiplied by the months remaining on the current term, and again by a full year, it's the number that actually changes a negotiating position.
Overage cuts the other way too. A team that has grown past its purchased seat count is paying overage, sometimes at a contracted premium above list price — a mismatch worth catching before the invoice does.
20 seats purchased, 14 seats used in the latest review, at $18 per seat per month, with 4 months remaining in the term: that's 6 unused seats and 70% utilization. Monthly avoidable spend is $108. Through the 4 remaining months of the term, that's $432 in avoidable spend. If the renewal goes through at the same seat count for a full year, it's $1,296 that a seat reduction to 14 would release.
Unused seats are purchased seats minus seats used in your latest review. Buying 20 seats and finding 14 actively used in your last audit means 6 unused seats and 70% utilization — a number worth having in hand before the renewal conversation starts.
Monthly avoidable spend is unused seats multiplied by the price per seat. 6 unused seats at $18 each is $108 a month, $432 through a 4-month remaining term, and $1,296 over a full year if the seat count is never adjusted at renewal.
Seats used above the purchased count become overage, billed at list price plus any contracted overage premium you enter — 0% keeps the same per-seat price as a default. The calculator reports extra annual spend from the overage the same way it reports avoidable spend from unused seats, so either direction of mismatch has a dollar figure attached.