---
title: "Conversion rate: definition, formula and example"
description: "The share of visitors who buy. An offer test's most reported number and its least sufficient: a better-converting offer can earn less."
url: https://offersuite.io/glossary/conversion-rate
updated: 2026-10-13
---

# Conversion rate

The share of visitors who buy. An offer test's most reported number and its least sufficient: a better-converting offer can earn less.

## In plain words

Conversion rate is the share of visitors who place an order: orders divided by visitors, over the same traffic. It is the most common success metric for a product page or an offer test.

On its own it misleads, because it counts a $40 order that earns $15 the same as a $102 order that earns $48. Lower prices and richer free gifts raise conversion almost by definition. Whether they raise profit depends on the margin they give up, which is what profit per visitor measures.

## Formula

- Conversion rate = orders ÷ visitors
- Profit per visitor = conversion rate × margin per order

## Worked example

At 3.0% conversion the coffee bag earns $0.46 per visitor on a $15.36 margin. Adding a mug might raise conversion. It has to raise it by 40.8% just to stand still.

### The example order

A $40.00 bag of coffee, shipped free, every cost counted

Revenue $40.00 to contribution margin $15.36 (38.4%)

Revenue

$40.00

Cost of goods

−$12.00

Pick and pack

−$1.18

Packaging

−$0.50

Shipping label

−$7.50

Card fee per order

−$0.30

Refunds

−$2.00

Card processing

−$1.16

Contribution margin

$15.36

2 declared kinds cost nothing on this option

Computed by the margin engine in Offer Suite's own code, in whole cents, from a $40.00 bag of coffee with a $12.00 unit cost.

## Conversion rate is not the metric an offer test should decide on

Decide on profit per visitor, and read conversion as one of its two parts. An arm that converts worse and earns more per visitor is the better offer. A report that shows only conversion will pick the other arm.

## Using it

Measure conversion for the offer, not the page: the share of visitors who saw the offer and bought one of its options. Split it by option when an offer has several, because the mix between options moves profit as much as the overall rate does. And read it next to profit per visitor, never alone. Watch the traffic mix as well: a campaign that sends colder visitors lowers conversion without the offer having changed at all, which is why offers should be compared on the same traffic at the same time.

## Related

- [Glossary **Glossary of offer economics** The terms behind offer profit, defined plainly with their formulas and a worked number: contribution margin, profit per visitor, break-even lift and more.](https://offersuite.io/glossary)
- [Calculator **Offer option calculator: profit per visitor** Compare up to three offer options on profit per visitor, margin per order times conversion, and see the conversion lift each one needs to match the best.](https://offersuite.io/calculators/offer-option-profit-per-visitor)
- [Calculator **Gift with purchase profit calculator** What a free gift costs per order, after its unit cost, its extra pick and its handling, and how much conversion it has to add to pay for itself.](https://offersuite.io/calculators/gift-with-purchase-profit)
- [Glossary **Profit per visitor: definition, formula and example** The profit an offer earns for every visitor who sees it: margin per order times conversion rate. It weighs a lower price against more buyers fairly.](https://offersuite.io/glossary/profit-per-visitor)
- [Glossary **Break-even conversion lift: definition and formula** How much more an offer has to convert to earn, per visitor, what another offer earns: the gap a cheaper offer, a gift or a discount must close.](https://offersuite.io/glossary/break-even-conversion-lift)
- [Glossary **Average order value (AOV): definition and formula** Total order revenue divided by the number of orders. Useful for spotting a trend, misleading for setting thresholds because it hides the shape of your orders.](https://offersuite.io/glossary/average-order-value)