Model your existing sustainer base and next acquisition cohort side by side — 60-month projections based on actual attrition curves
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Existing sustainer base optional
Active sustainers
Leave blank to model acquisition only
Avg monthly gift — existing ($)
Current average per sustainer
New acquisition cohort
Avg monthly gift — new ($)
Per sustainer, at acquisition
Acquisition target
Size of this cohort
Activation rate (%)
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What is activation rate?
Of your acquisition target, what % actually get their first gift processed? Pre-filled at 100%. Lower this to model failed first payments, incomplete signups, or credit card declines.
% with successful first payment
Cost per acquisition ($)
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What is true CPA?
The price on your vendor contract is not your real CPA. After clawbacks, declined payments, and short-tenure donors, your true cost per active sustainer is often 20–40% higher.
Mo 1 = Acquired — defaults to 100%. Only reduce Mo 1 if modeling pre-debit attrition (e.g., failed first payments). Remaining cells show cumulative % of original cohort still retained.
Mo 12 ★ matches the preset label.
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5-year investment summary
Gross revenue
$1,234,567
$2,469 per sustainer
Total cost
$175,000
$350 per sustainer
Net revenue
$1,059,567
$2,119 per sustainer
Program ROI
+605% ROI
7.05:1 per $1 spent
Revenue by year
Year 1
$120,450
Year 2
$198,320
Year 3
$276,190
Year 4
$334,060
Year 5
$305,547
Break-even: month 14 — every dollar after that is net revenue
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