CPM × CTR × CVR. The three numbers that decide your CPC and CPL on any paid channel. Punch them in and see how the cascade falls.
CPC
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CPL / CPA
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Daily Clicks
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Daily Conversions
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CPC = CPM ÷ (10 × CTR%)
CPL = CPC × 100 ÷ CVR%
Or written end-to-end: CPL = CPM × 10 ÷ (CTR% × CVR%)
Use this for sanity checks: if your account's actual CPL doesn't match the math, something's off — usually attribution loss, weird audience overlap, or one of the inputs is reported wrong.