Live unit scorecard for LTV:CAC, with a contribution engine peel, payback↔lifespan time twin, and surplus strip.
Planning sketch only. Not GAAP/IFRS metrics, audited unit economics, or investment advice. Align ARPU, margin, churn, and CAC definitions with your finance team.
By Ahmet C. Toplutaş·Site owner & editor · Business tools
Last updated May 21, 2026 · Reviewed May 21, 2026 · Planning estimates only - not tax, medical, or investment advice
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Unit economics asks whether one average customer returns more lifetime contribution than it costs to acquire. This board leads with LTV:CAC as the scorecard headline, then shows the engine, time twin, and surplus that produced it.
This page's framing is a unit scorecard, with a contribution engine peel, a payback↔lifespan time twin, and a surplus strip. It is not the CLV simple↔DCF and lifespan ladder, not CAC payback's burn-down fill, and not contribution margin's $/unit↔% volume rail.
Decision framing: “Is this unit worth scaling, or do ratio, payback, or surplus break first?”
Planning sketch only. Not GAAP/IFRS metrics, audited unit economics, tax advice, or investment advice. Align ARPU, margin, churn, and CAC definitions with your finance team. See our disclaimers.
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Monthly contribution = ARPU × gross margin %. That single dollar figure feeds both simple LTV (contribution × lifespan) and payback (CAC ÷ contribution). The peel keeps the engine visible so a shiny ratio is never detached from the margin story.
Tip: load Thin ratio. Contribution still prints, but LTV:CAC sits under a healthy planning floor.
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Payback months ask how long contribution takes to recover CAC. Lifespan months ≈ 1 ÷ monthly churn ask how long the average logo stays. If payback is longer than lifespan, the time gate fails on this sketch even when a raw LTV:CAC looks “okay” from averaging.
Month-by-month CAC burn-down fill lives on the CAC payback board. This twin is the scorecard gate, not the burn-down chart.
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Unit surplus = simple LTV − CAC. It is the expected contribution left after acquisition on an undiscounted model. Optional fixed costs divide by monthly contribution to sketch how many customers cover the base (a scale gate, not a full break-even suite).
For discounted LTV and churn→lifespan ladder depth, hand off to CLV.
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Scorecard inputs and outputs.
Example (SaaS healthy): ARPU $120, margin 80% → CM $96; churn 3%/mo → lifespan ≈ 33.3 mo; LTV ≈ $3,200; CAC $800 → ratio ≈ 4.0×; payback ≈ 8.3 mo (clears); surplus ≈ $2,400.
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Sibling boards when the job is LTV depth, payback fill, CAC stack, or CM detail.
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Scenario A: SaaS healthy. Ratio clears ~3×+, payback sits inside lifespan, surplus is clearly positive.
Load Elite unit: fat surplus and short payback. The scorecard reads as a scale green light on this sketch.
Scenario B: Thin ratio. Contribution exists, but LTV:CAC sits under a common planning floor. Fix CAC, churn, or margin before pouring more spend.
Scenario C: Slow payback. The time twin fails: recovery takes longer than expected stay. Ratio alone can mislead.
Scenario D: Need DCF LTV. Same inputs with discounting on CLV.
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Stop here for the combined unit scorecard. Hand off for discounted LTV, payback burn-down, CAC composition, or detailed contribution margin rails.
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It closes a unit scorecard from CAC, monthly ARPU, gross margin %, and monthly churn. A contribution engine peel shows monthly contribution, a payback↔lifespan time twin checks whether recovery fits inside expected stay, and a surplus strip prints simple LTV − CAC. Optional fixed costs sketch customers needed to cover the base.
Unit economics asks whether one average customer relationship earns more contribution over its life than it costs to acquire. This board orchestrates LTV:CAC, payback, lifespan, and surplus on one scorecard.
Monthly contribution = ARPU × gross margin %. Lifespan months ≈ 1 ÷ monthly churn. Simple LTV = contribution × lifespan. This is an undiscounted sketch. Discounted LTV depth lives on the CLV board.
Many SaaS planning rules of thumb treat about 3× as a healthy floor and 4×+ as strong, assuming payback also clears inside lifespan. Ratios under 2× usually need CAC, churn, or margin work before you scale spend.
Payback months = CAC ÷ monthly contribution. Lifespan months ≈ 1 ÷ monthly churn. If payback is longer than lifespan, the average customer leaves before you recover acquisition cost on this sketch.
CLV owns simple↔DCF and lifespan ladder depth. CAC payback owns burn-down fill and stay-gate framing. Contribution margin owns $/unit↔% and volume rail. This page owns the combined scorecard: ratio, engine peel, time twin, and surplus.
No. It is a planning sketch only. Not GAAP/IFRS metrics, audited unit economics, or investment advice. Align ARPU, margin, churn, and CAC definitions with your finance team. See our disclaimers.
LIVE UNIT SCORECARD
Scorecard →Scene presets
Scale gate
UNIT SCORECARD
LTV:CAC
4.00×
LTV $3,200 ÷ CAC $800
CONTRIBUTION ENGINE PEEL
CM feeds both simple LTV and payback on this scorecard.
PAYBACK ↔ LIFESPAN TIME TWIN
Burn-down month fill lives on CAC payback.
SURPLUS STRIP
Discounted LTV depth: CLV calculator.
Updates as you type. Share writes board state; typing does not rewrite the address bar.
LTV:CAC
4.00×
Payback 8.3 mo · surplus $2,400
LTV:CAC compares simple lifetime contribution to acquisition cost. The time twin checks whether payback fits inside expected lifespan from churn.
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