Effective CPI, not headline CPI
Paid campaigns pull organic installs with them through store ranking. Crediting that uplift lowers your effective CPI and is standard practice — but be conservative: attributing 50% organic uplift to paid is how campaigns get scaled into losses.
The levers, in order of impact
When payback is too slow, work down this list rather than reflexively cutting bids.
- • D7 retention: it reshapes the whole curve and compounds into every later day.
- • ARPDAU: placement mix and pricing usually move faster than retention work.
- • Creative and targeting: they set CPI, which is the denominator of everything here.
- • Geo mix: shifting spend toward higher-eCPM markets can fix payback without touching the product.
Cash flow versus profitability
A 180-day payback is profitable but cash-hungry: you fund six months of spend before the cohort returns it. Model the working-capital gap alongside the ratio — plenty of technically profitable UA programmes have run companies out of cash.
Related guides
Long-form playbooks on the same topic, written by the RevenueLab editorial team.
Revenue Model Glossary: 40 Terms Every Operator Should Know (CPM, RPM, ARPU, LTV, CAC, ROAS…)
Plain-English definitions for the 40 revenue-modeling terms that show up across creator, SaaS, ecommerce, and ads — with the exact formula, a worked example, and the most common misuse for each.
Read the guideLTV:CAC Benchmarks for SaaS in 2026 (and What 'Good' Actually Means)
What ratios investors look for, why 3:1 isn't always the right target, and how payback period interacts with LTV:CAC across PLG, SMB, and enterprise SaaS.
Read the guideThe Google Ads ROAS Playbook: Modeling Spend Before You Burn It
A structured approach to modeling ROAS before scaling Google Ads — break-even CPA, gross-margin-adjusted ROAS, and the assumptions most spreadsheets get wrong.
Read the guideFAQ
What payback period should I target?
Venture-funded teams often accept 180 days; bootstrapped teams usually need 30–90 to stay solvent. The right number is set by your cash position, not by an industry rule.
Is D30 ROAS a good early signal?
Yes — it's the standard early read. Many teams scale when D30 ROAS clears 30–40% for casual titles, because the rest of the curve then covers the remainder.
Should I count organic uplift?
Count it, but conservatively and only if you can observe it — compare organic install rates during and outside campaign windows before setting the input above 20%.
Why does my payback never arrive?
Usually because ARPDAU is too thin for the CPI you're paying. If D180 LTV is below CPI, no bidding change fixes it; monetization or audience quality has to change.
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