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Startups & Business › Metrics & Unit Economics

Gross Margin

Revenue minus the direct cost of delivering it, as a share of revenue.

Tech Entrepreneur · Product-Market Fit · core

Also known as: gross margin, gross profit margin, COGS margin

Gross margin is (revenue − cost of goods sold) ÷ revenue: what remains after delivering, before operating expenses. Software margins run high (hosting and support pennies on the revenue dollar); services and marketplaces run thin. It sets the ceiling for everything downstream — no business outgrows a broken gross margin, because scale multiplies the cost side too.

$100k revenue − $20k delivery cost = $80k gross profit → 80% margin (healthy SaaS shape)
$100k revenue − $85k delivery cost = $15k → 15% (every growth dollar needs $0.85 more)

Classify delivery costs honestly: hosting, support burden, professional-services delivery, payment fees, third-party API costs embedded per unit. Costs hidden in operating expenses flatter margin until diligence reclassifies them — in front of investors, which is the worst possible venue.

The classic mistakes:

  • Vanity gross margin. Excluding support, success and infra “because they’re fixed” — until scale proves they grow with revenue. If it grows with units, it is COGS-class; classify by behavior, not by wish.
  • Blended margins across lines. 90% SaaS blended with 10% services reads as healthy 70% while services bleed. Report per revenue stream, decide per stream (fix, reprice, or exit).
  • Ignoring margin trajectory. Margins compress as support loads grow, AI inference costs scale, or competition forces discounting. Trend it quarterly; a drifting margin is strategy speaking.
  • Pricing below margin reality. Deals closed under delivery cost “for the logo” institutionalize losses that renew annually. Floor prices on true unit cost, with strategic exceptions explicit and rare.
  • Confusing with net margin. Gross margin funds operations; net is what remains after. Both matter, neither substitutes — report the full waterfall, not the flattering layer.

Guard it: price against fully-loaded unit cost, review per stream quarterly, and treat margin compression as the strategic alarm it is. See contribution margin for the per-sale sibling.