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Calculate website conversion rate and cost per conversion from sessions, conversions, and spend.
Use this website conversion rate calculator to evaluate how effectively site traffic turns into leads, signups, or purchases. The calculator is designed to give a fast answer, but the quality of the answer still depends on accurate inputs and a clear idea of what decision you are trying to support.
- Enter Website Sessions, Conversions, and Ad Spend using the same units you plan to compare or report.
- Read the main conversion rate first, then use the supporting outputs to understand the trade-offs behind that result.
- Compare your numbers with the worked examples below if you want a quick reasonableness check.
Conversion rate shows how much of your traffic completes the target action, while cost per conversion links campaign performance directly to spend. On this page, the primary output is conversion rate.
Scenario 1: 18,000 sessions, 420 conversions, $2,900 spend. Inputs used: visitors: 18000, conversions: 420, adSpend: 2900. Example result: 2.33%. This website traffic mix converts at 2.33%. Scenario 2: 7,600 sessions, 256 conversions, $1,150 spend. Inputs used: visitors: 7600, conversions: 256, adSpend: 1150. Example result: 3.37%. Across this site traffic period, the conversion rate comes to 3.37%.
Core formula: conversion rate = conversions / visitors * 100. The calculator compares completed actions with total traffic to show how efficiently a page, campaign, or funnel turns visitors into results.
- Cost per conversion uses ad spend divided by conversions.
- Consistent attribution windows matter if you compare campaigns across time periods.
Use this calculator when reviewing landing pages, campaigns, funnels, or channel performance and you need a fast conversion benchmark. Related paths for follow-up analysis include conversion rate calculator, campaign conversion rate calculator, lead conversion rate calculator, and sales conversion rate calculator.
Most bad outputs come from a few repeated input errors or interpretation mistakes. Use this short checklist before relying on the result.
- Comparing campaigns that use different conversion definitions.
- Using mismatched time windows for traffic, conversions, and spend.
- Looking only at conversion rate without checking conversion quality or revenue.
