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Conversion Rate Calculator

Computes the conversion rate (conversions / visitors × 100), conversions per 1,000 visitors and visitors per conversion, and the number of visitors required to reach a target number of conversions at the same rate.

When to use

You have visitor and conversion counts for a page, funnel step, email or campaign and need the rate or the traffic a conversion goal requires.

Do not use when: You are comparing two variants for statistical significance (use ab-test-significance) or need cost-based metrics such as CPA (use ad-metrics).

Formula

conversion_rate_percent = conversions / visitors × 100; visitors_per_conversion = visitors / conversions; required_visitors = ceil(target_conversions × visitors / conversions)

Inputs

Parameter	Type	Required	Description
`visitors`	integer	yes	Number of visitors, sessions, recipients or users exposed to the step. Range: > 0, ≤ 10000000000000
`conversions`	integer	yes	Number of them that completed the goal (purchase, sign-up, click). Range: ≥ 0, ≤ 10000000000000
`target_conversions`	integer	no	Optional conversion goal; returns the visitors needed at the observed rate. Range: > 0, ≤ 10000000000000

Outputs

Output	Type	Unit	Description
`conversion_rate_percent`	number	%	conversions / visitors × 100.
`conversions_per_1000_visitors`	number		conversions / visitors × 1000.
`visitors_per_conversion`	number		visitors / conversions (only when conversions > 0).
`required_visitors_for_target`	number		target_conversions / conversion rate, rounded up (only when target_conversions given and conversions > 0).

Example

2,500 visitors, 75 conversions, target 300: {"visitors":2500,"conversions":75,"target_conversions":300} → {"conversion_rate_percent":3,"conversions_per_1000_visitors":30,"visitors_per_conversion":33.33,"required_visitors_for_target":10000}

800 visitors, 12 conversions: {"visitors":800,"conversions":12} → {"conversion_rate_percent":1.5,"conversions_per_1000_visitors":15,"visitors_per_conversion":66.67}

GET https://tttkmbb.com/api/v1/calculate/conversion-rate?visitors=2500&conversions=75&target_conversions=300

Machine access

API: GET https://tttkmbb.com/api/v1/calculate/conversion-rate (query parameters) or POST with a JSON body {"inputs": {...}}
Schema: https://tttkmbb.com/api/v1/calculators/conversion-rate · Markdown: https://tttkmbb.com/business/conversion-rate.md · JSON definition: https://tttkmbb.com/business/conversion-rate.json
MCP: server https://tttkmbb.com/mcp, tool run_calculator with calculator_id="conversion-rate"
OpenAPI operationId: calculate_conversion_rate
Freshness: static. Authentication: none. Rate limit: fair use (see rate limits).

Sources

Google Ads Help – Conversion rate: Definition (reference)
Wikipedia – Conversion rate optimization (reference)

FAQ

Should I count visitors or sessions?

Use the same unit consistently with the conversion definition: unique visitors for 'share of people who converted', sessions for 'share of visits'. Rates differ between the two.

How precise is a rate from a small sample?

A rate from 75 conversions has roughly ±0.7 percentage points of sampling error at 95 % confidence; use margin-of-error to quantify it.

Related calculators

A/B Test Significance Calculator — Test whether two conversion rates differ significantly.
Margin of Error Calculator — Confidence interval for the observed rate.
Ad Metrics Calculator (CPM, CPC, CTR, CPA) — Cost-based ad metrics such as CPC and CPA.