Ad ROAS, CPC & CPM Calculator NZ 2026

This calculator measures how well your advertising is performing by turning ad spend and results into the key metrics marketers live by: ROAS, CPC, CPM, CPA, click-through rate and conversion rate. Whether you advertise on Google, Meta, TikTok or anywhere else, these numbers tell you whether your money is working, where it is leaking, and how campaigns compare. The headline metric is ROAS, return on ad spend, the revenue you earn for every dollar spent: a ROAS of 4 means four dollars back for every dollar in. Around it sit the cost metrics that explain your results: CPM, the cost per thousand impressions, shows how expensive it is to be seen; CPC, the cost per click, shows what each visitor costs; CPA, the cost per acquisition, shows what each sale or sign-up costs; while click-through rate and conversion rate reveal how well your ad earns clicks and how well your page turns those clicks into customers. You enter your ad spend, impressions, clicks, conversions and the revenue generated, and the calculator returns all of these metrics at once. Use it to judge whether a campaign is profitable, to diagnose problems, a low click-through rate points to the ad, a low conversion rate points to the landing page or offer, and to compare channels and campaigns on a level footing. Pair it with your customer lifetime value to know how high a CPA you can actually afford, since a sale is worth far more than its first purchase. These are exact calculations from the figures you enter; the insight comes from feeding in accurate numbers and acting on what they reveal.

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4x
return on ad spend (ROAS)
Cost per click$0.50
Cost per 1,000 (CPM)$10.00
Cost per acquisition$12.50
CTR / conv rate2% / 4%

ROAS is revenue per dollar of spend. Compare CPA against your customer lifetime value to judge what you can afford. Exact from your figures.

How it works

ROAS is revenue divided by ad spend. Cost per click is spend divided by clicks. CPM is spend divided by impressions, times one thousand. Cost per acquisition is spend divided by conversions. Click-through rate is clicks divided by impressions, and conversion rate is conversions divided by clicks, both as percentages.

Worked example

With $500 of spend, 50,000 impressions, 1,000 clicks, 40 conversions and $2,000 of revenue: ROAS is 4.0, four dollars back per dollar spent. CPC is 50 cents, CPM is $10, and CPA is $12.50. The click-through rate is 2 percent and the conversion rate is 4 percent. If a customer is worth more than $12.50 over time, scaling this campaign makes sense.

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Frequently asked questions

What is a good ROAS?

It depends on your margins. A ROAS of 4, four dollars of revenue per dollar spent, is healthy for many businesses, but a low-margin product may need a higher ROAS to profit, while a high-margin or high-retention product can be profitable at a lower ROAS. Compare it to your costs.

What is the difference between CPC, CPM and CPA?

CPM is the cost per thousand impressions (being seen), CPC is the cost per click (a visitor), and CPA is the cost per acquisition (a sale or sign-up). Together they show where money is spent and how efficiently it converts into customers.

How high can my cost per acquisition be?

As high as you can afford given the value of a customer. Compare CPA to your customer lifetime value, not just the first sale. If a customer is worth far more over time, a higher CPA can still be very profitable.