Conversion Rate Calculator
Measure the percentage of website visitors who complete a desired action, such as a purchase or sign-up. Use it to evaluate campaign performance or A/B test landing pages.
About this calculator
Conversion rate expresses what fraction of your visitors take a target action — buying, signing up, or downloading. The formula is: Conversion Rate (%) = (Conversions / Total Visitors) × 100. A 'conversion' is whatever goal you define: a completed purchase, a form submission, or a button click. Even small improvements in conversion rate have outsized revenue impact because they multiply across all traffic. For instance, moving from a 2% to a 3% conversion rate on 10,000 monthly visitors means 100 additional conversions without spending more on ads. This metric is central to CRO (Conversion Rate Optimisation), where teams systematically test page elements to raise the percentage. Industry average e-commerce conversion rates typically range from 1–4%, though top performers exceed 5%.
How to use
Your online store received 4,500 visitors last month and recorded 135 completed purchases. Enter 4500 in Total Visitors and 135 in Conversions. The calculator computes: Conversion Rate = (135 / 4500) × 100 = 3.0%. After redesigning your checkout page, next month you get 4,500 visitors and 180 purchases: (180 / 4500) × 100 = 4.0%. That 1-percentage-point improvement represents 45 extra sales per month. Annualised, that's 540 additional transactions — making a compelling case that UX investment directly drives measurable revenue growth.
Frequently asked questions
What is a good conversion rate for an e-commerce website?
Most e-commerce websites convert between 1% and 4% of visitors, with the global average hovering around 2–2.5%. Top-performing stores in competitive niches regularly achieve 5% or more by combining strong product-market fit, fast page loads, clear calls to action, and streamlined checkouts. Rather than chasing an industry benchmark, the most actionable goal is to continuously improve your own baseline — even a 0.5% gain can translate to significant revenue at scale. Segment your conversion rate by traffic source (organic, paid, email) to identify which channels deliver your most valuable visitors.
How does conversion rate affect return on ad spend (ROAS)?
Conversion rate and ROAS are directly linked: if you double your conversion rate without changing your ad spend or average order value, you double your ROAS. For example, spending $1,000 on ads that drive 500 visitors at a 2% conversion rate and $50 average order yields $500 revenue (0.5× ROAS). Improving conversion rate to 4% doubles revenue to $1,000 (1× ROAS) from the same ad spend. This is why CRO is often considered more cost-efficient than simply increasing ad budgets — you extract more value from existing traffic rather than paying for more of it.
Why does my conversion rate vary so much between traffic sources?
Different traffic sources bring visitors with very different levels of intent and familiarity with your brand. Email subscribers and returning customers convert at 5–10% or more because they already trust you. Paid search visitors searching purchase-intent keywords (e.g., 'buy running shoes size 10') convert at 3–5%, while cold social media traffic might convert at below 1% because users are in discovery mode rather than buying mode. Mixing all sources into a single conversion rate hides these differences. Segment by channel in your analytics platform to pinpoint where the biggest optimisation opportunities lie.