CPM to CPC Guide

Because CPC is highly sensitive to CTR. If CTR drops, effective CPC increases even with the same CPM.

Use a range instead of a single average. Plan with low, base, and high CTR scenarios to reduce forecasting bias.

No. It helps price traffic, but profitability still depends on post-click quality, conversion rate, and backend economics.

Use CTR-based conversion to compare pricing models across display, native, and performance buying.

Core formulas

1. CPC = CPM / (1000 x CTR)

2. CPM = CPC x 1000 x CTR

3. CTR in formulas must be decimal (1.2% = 0.012)

1. Same CPM becomes expensive CPC when CTR drops.

2. Small CTR changes can significantly shift effective CPC.

3. Use scenario ranges (low/base/high CTR) before buying volume.

1. Run conversion at expected CTR and worst-case CTR.

2. Compare resulting CPC with your break-even CPA model.

3. Validate post-click quality, not only front-end pricing.

Because CPC is CTR-sensitive. If CTR drops, effective CPC increases even when CPM is unchanged.

Use low/base/high CTR scenarios rather than a single average to avoid optimistic forecasts.

No. It prices traffic, but profitability still depends on conversion quality and backend unit economics.