Which numbers to track each week, and what to aim for

By the HonestTag team · Published November 10, 2026 · Updated November 11, 2026

A marketing dashboard can show a dozen figures. Four of them tell you whether your marketing is working.

The four numbers, and the question each one answers

1. New customers: is the business growing? Buyers placing their first order with you. Growth comes from this number. Aim for it to rise while what each one costs stays under your target.
2. New-Customer Acquisition Cost (NCAC): what does a new customer cost? All marketing spend divided by new customers. Aim for it to stay at or under your target.
3. New-Customer Marketing Efficiency Ratio (NMER): do first orders pay for the marketing? Net sales from new customers' first orders for each $1 of marketing. Aim for it to stay at or above your break-even.
4. Returning buyers' share of net sales: how much of the store runs on repeat orders? No target. It explains why the store-wide ratio reads higher than NMER, and it tells you how much repeat orders can carry.

Once a month, add the Marketing Efficiency Ratio (MER): net sales from every order for each $1 of marketing. It is the whole store's number and moves slowly, so read it over 30 days or more, beside the returning share.

Everything else is a check you open when one of the four moves. Cost per order (all buyers) shows whether spend is buying repeat orders. Average Order Value (AOV) split into first orders and repeat orders tells you what a first order is worth. First-click new-customer cost shows the same cost for the customers whose first click was a paid ad.

Set your targets from your own margin

A target means something only against your own costs, so one set on an old margin judges later weeks on the wrong scale once costs or prices change. Start with your gross margin: what is left of each $100 of sales after product cost, the shipping and packing you pay, and payment fees. Our break-even page walks through what to count. From it you get two break-even numbers:

• Break-even NCAC = first-order average order value × gross margin. It is what an average first order leaves after product, shipping and fees.
• Break-even NMER = 1 ÷ gross margin. That is 2.0 at a 50% margin and 2.5 at a 40% margin.

How far from break-even to aim depends on how often your customers come back.

• Most of your buyers order once. Aim under break-even, so first orders keep a profit. With made-up numbers: a $90 first order at a 50% margin, where you want first orders to keep 20 cents of each sales dollar after marketing. Your NCAC target is $90 × (0.50 − 0.20) = $27, and your NMER target is 1 ÷ 0.30, about 3.3.
• Many of your buyers come back. Break-even is the usual starting point: first orders pay for themselves and repeat orders bring the profit.
• Above break-even means each new customer loses money on the first order and you wait for repeat orders to pay it back. That needs proof from your own customers of how many months it takes, and the cash to wait. Cohort payback shows how to measure it.

Are your new customers profitable? works these numbers through a whole month.

Daily, weekly, monthly

• Daily: glance at whether NCAC is rising or falling, with new customers beside it. Do not act on one day.
• Weekly: compare NCAC and NMER with your targets, look at what each ad platform claims beside what your orders show, and change at most one thing. Two changes in one week make the next week impossible to read.
• Monthly: read MER and AOV over 30 days or more against the period before, and walk the month as first orders and repeat orders.

Better, worse, or chance

A count of customers moves by chance even when nothing changed. A rough rule for how much: about 1 ÷ the square root of the count. With 25 new customers a week, chance alone moves the count by about 20% (1 ÷ 5). With 100, about 10%. With 400, about 5%. A week that drops 15% at 25 new customers is inside that range, so it tells you nothing yet.

So treat a move as real only when it is bigger than that range and bigger than about 10%. Compare the last 4 weeks with the 4 weeks before, and move the window forward one week at a time. Look at the latest week beside it, but do not judge it alone.

Which way is better:

• New customers: up is better.
• NCAC: down is better. A small rise while spend and new customers both grow is normal, because added spend reaches people less ready to buy. It only turns bad when it passes your target.
• NMER: up is better. A dip while spend grows and first-order sales still grow is how scaling usually reads, as long as NMER stays at or above your break-even. A dip with first-order sales flat is worse.
• Returning buyers' share: neither. It explains MER. If it rises while new customers fall, the problem shows on new customers.
• MER: up over 30 days or more is better.

Judge a budget increase by what the added money bought

When you raise spend, the average cost per new customer hides what the extra money did. The numbers below are made up to show the arithmetic. Last week a store spent $3,000 and won 75 new customers: $40 each. This week it spent $3,700 and won 87: about $42.50 each. Against a $45 break-even, the average still looks fine.

Now look at only the added money. $700 more bought 12 more new customers: about $58 each, well over the $45 break-even. The average stayed under because the first $3,000 still did its work. If you keep adding at that rate, the average climbs toward the cost of the added customers.

One week is not enough to be sure. At 87 new customers, chance alone can move the count by about 9 (the square root of 87), close to the 12 added. Check that the cost of the added customers holds over the next few weeks before you add more.

Give a change time before you judge it, because orders from a spend change keep arriving for days after it. Raise spend in larger steps when NCAC sits well under your target and in smaller ones when it is close, then hold while new customers catch up.

What this means

Read together, the four numbers say where the business stands. New customers rising, NCAC under target and NMER at or above break-even means marketing pays for growth on first orders. A healthy MER beside a weak NMER means repeat buyers are carrying the store while new-customer marketing does not yet pay for itself, and a rising returning share confirms it. Cost per order falling while NCAC rises means spend is buying repeat orders, not new customers.

A move inside chance, or under about 10%, tells you nothing yet. Reading one week alone, or the average after a budget increase, can send money after customers who cost more than they leave.

On paid plans, HonestTag's Scorecard puts these numbers in one row from your Shopify orders and connected spend, each against the period before.

How HonestTag helps

• On the free Mirror plan, The Gap's "Who brought your customers" shows what Google Ads and Meta claim for the last 14 days beside the new customers whose first ad click was theirs, from your own orders. It sends no purchases to any ad platform.
• On paid plans, the Scorecard's first row holds the numbers on this page: Spend, Net sales, New customers, Returning-customer orders, NCAC, Cost per order (all buyers), NMER and MER, each with its change against the period before. The Net sales tile shows how much came from new customers and how much from returning buyers.
• On paid plans, you set your NCAC target and an MER floor on the Targets card. A short line under a tile explains a move, such as NMER easing because spend went up while new-customer sales still grew. You get an alert when 30-day MER falls below your floor.
• On paid plans, What changed this week compares the last 7 days with the 7 before and shows the cost of each added new customer when spend rose enough to judge.
• On higher plans, weekly Verdicts judge each channel against your NCAC target, and Cohorts shows how many months new customers take to pay back what they cost.

Install HonestTag free from the Shopify App Store and see on the Mirror plan what Google Ads and Meta claim beside the new customers your orders show they first brought.

Frequently asked questions

Sources

• HonestTag: Break-even Return on Ad Spend (ROAS)
• HonestTag: Are your new customers profitable?
• HonestTag glossary: how each metric is defined
• HonestTag pricing and plan limits