Shopify Custom Size Pricing Calculator Free: 2027 Guide
Short answer: what a free Shopify custom size pricing calculator can and can't do
Yes, you can run a free calculator on a live store, but "free" is narrow in every app. The Shoperize Price Calculator Free plan supports one published area calculator on up to three products. It turns a shopper's room size into a purchasable number of boxes, rolls or packages, and Shopify catalog prices still determine what the customer is charged.
"Custom size pricing" can mean two different things, and the difference decides which app fits you:
- Free-form size pricing: the shopper enters any width and height, and the app computes a price from a formula such as (width x height) x rate. Signs, banners, made-to-measure blinds and cut-to-size glass work this way.
- Area to packages: the shopper enters a room or project size, and the calculator works out how many boxes, rolls or bags to buy, including waste and rounding. Flooring, tile, wallpaper, turf, fabric by the roll and landscaping materials work this way.
Shoperize Price Calculator is built for the second model. If you sell flooring, tile, wallpaper, turf, fabric or building materials in fixed packages, keep reading. If you need an arbitrary price on every cart line, the section on catalog prices below explains why this app is not the right tool.
What the Shoperize Free plan includes
Free supports one published area calculator on up to three products. That is enough to run a real calculator on live product pages, not just a demo. Advanced capabilities depend on the plan, so check the App Store listing for current plan details before you decide.
What you can configure
- Unit conversion: shoppers can enter measurements in the unit they know, and the calculator converts to the unit your coverage is defined in.
- Waste: a percentage added to the measured area for cuts, pattern matching and mistakes.
- Package coverage: how much area one box, roll or pack covers.
- Rounding: how the result becomes a whole, purchasable quantity.
- Limits: minimum and maximum values so shoppers can't enter nonsense.
- Product assignments: which products use which calculator.
Measurements stay in the cart, and coverage updates when the quantity changes. That matters more than it sounds, as the example below shows.
Three ways to create rules
You can build a rule manually, start from a template, or generate an editable AI draft and adjust it. Plan limits apply to how you use these. An AI draft is a starting point for the same settings listed above, so you still confirm coverage, waste and rounding yourself.
What "published" means
A calculator is published when it is live on the product pages it is assigned to. Until then, treat it as a draft: set up one product, run your test cases, and only publish when the quantities match what you would calculate by hand. A checklist is further down.
Worked example: a 12 x 14 ft room on the Free plan
A shopper is tiling a 12 x 14 ft room. Your product is sold by the box, and each box covers 20 sq ft. You set waste to 10% and rounding to round up to whole boxes. The price below is an example figure, not a recommendation.
- Area: 12 x 14 = 168 sq ft.
- Add 10% waste: 168 x 1.10 = 184.8 sq ft.
- Divide by box coverage: 184.8 / 20 = 9.24 boxes. Whole boxes only, so round up to 10 boxes.
- Coverage and total: 10 boxes x 20 sq ft = 200 sq ft. At an example catalog price of $42 per box, the total is 10 x $42 = $420.
| Step | Calculation | Result |
|---|---|---|
| Room area | 12 x 14 | 168 sq ft |
| With 10% waste | 168 x 1.10 | 184.8 sq ft |
| Boxes (exact) | 184.8 / 20 | 9.24 |
| Boxes (rounded up) | round up | 10 |
| Coverage purchased | 10 x 20 | 200 sq ft |
| Example total | 10 x $42 | $420 |
The charge is the Shopify product price times the quantity. The calculator decides the quantity, not the price per box.
What the shopper sees in the cart
The cart holds 10 boxes and keeps the measurements the shopper entered, so the line still makes sense to them (and to your fulfillment team) later. If the shopper edits the quantity to 11, coverage updates to 220 sq ft. If they drop it to 9, they can see coverage fall to 180 sq ft, which is below the 184.8 sq ft they needed. Your team doesn't need to guess what happened.
For a fuller walkthrough of box math, see this square footage calculator setup for boxes, waste and cart.
What Free doesn't cover (and when you'd need a paid plan)
Free has clear edges:
- One published area calculator. If you need several different calculators live at once, Free doesn't cover that.
- Up to three products. A fourth product needs a different plan.
- Advanced capabilities depend on plan. The listing shows what each plan includes today, so verify there rather than relying on a blog post.
What Shoperize does not do
- It does not replace the line price with an arbitrary calculated amount.
- It is not a quote-request form or quote workflow.
- It doesn't offer quantity discounts, processing fees or multi-product bundles as features you can promise shoppers.
- It is not a sizing chart app (more on that in the FAQ).
If any of those is a must-have, say so up front when you evaluate tools. It saves a trial that was never going to fit.
How pricing stays tied to Shopify catalog prices
The calculator sets the quantity. Shopify then charges the catalog price times that quantity. Your price per box lives on the product or variant, where it already lives.
That has practical benefits:
- Your discount codes, taxes, shipping rules and reports keep working on ordinary line items.
- Finance sees the same price per unit in Shopify as the shopper saw on the page.
- Changing a price means editing the product, not a separate calculator formula.
The trade-off is real: this approach is not suited to free-form formulas like (width x height) x rate with an arbitrary line price. If you sell banners cut to any size, a calculator built for that model is the better fit. For a side-by-side look at the approaches, read which custom size pricing method works for your catalog.
Why free workarounds fail: variants per size and quote forms
If a free calculator doesn't fit, merchants usually fall back on two workarounds. Both look cheap and cost more later.
Variant per size
Creating a variant for every size sounds simple until you count. Shopify limits how many variants a product can have, and a flooring or fabric line with many sizes, finishes and lengths multiplies fast. Every price change means editing many variants. And a variant for "12 x 14 ft" doesn't help the shopper with a 12 x 13.5 ft room.
Quote forms
A form that asks for dimensions and promises a reply works, but slowly. Someone on your team does the math by hand, replies by email and waits. Shoppers who wanted an answer now often buy elsewhere. Manual quotes also introduce errors, such as forgetting waste or using the wrong coverage figure.
The wrong-quantity problem
Take a tile shop and the same 12 x 14 ft room. The shopper divides 168 by 20, gets 8.4, rounds up to 9 and buys 9 boxes: 180 sq ft. Their room needs 184.8 sq ft with 10% waste. They are short by 4.8 sq ft, and the next batch of tile may be a different dye lot. That becomes a support ticket, a reorder or a return.
Package rounding plus quantity checks in the cart prevent that. The calculator gives 10 boxes, shows the coverage, and keeps the measurements attached to the line so the shopper can see why.
How other calculator apps handle "free" (App Store listings, as read Nov 2026)
"Free" means three different things in app listings, so read carefully:
- Free plan: a tier you can keep using on a live store, with limits.
- Free trial: full or partial access for a set period, then you pay.
- Free on development stores: you can build and test, but a live store needs a paid plan.
Here is what the public listings showed on 2026-11-06. Plans and prices change, so verify on each listing.
| App | Listed pricing | Rating (reviews) | What "free" means |
|---|---|---|---|
| Apippa Custom Price Calculator | Free plan listed for development stores; paid from $19.99/month, based on revenue from custom products | 4.9 (211) | Free on dev stores |
| MS Custom SizePrice Calculator | From $29.99/month, 14-day free trial | 3.0 (18) | Free trial |
| M Custom Size Price Calculator | From $24.99/month, 14-day free trial | 5.0 (21) | Free trial |
| Shoperize Price Calculator | Free plan: one published area calculator on up to three products | See the listing | Free plan on a live store |
I haven't listed features for the other apps beyond their pricing, because their listings are the source of truth. Review each one for your own use case. If you are weighing Apippa specifically, see the Apippa alternative comparison. For a wider checklist of what to ask any vendor, there is a buyer's guide to custom price calculator apps.
Is Free enough for your store? A quick decision table
| Situation | Free enough? | What to check |
|---|---|---|
| One flooring line, a few best sellers | Likely yes | Coverage per box and waste are the same across the line |
| Three wallpaper SKUs | Likely yes | Roll coverage and pattern repeat waste |
| Full catalog of many products | No, plan upgrade or a pilot first | Which products drive most calculator-related questions |
| Free-form sizes with a formula price | No | You need an app built for arbitrary line pricing |
| You need a quote workflow | No | A quote or form tool fits better |
A pilot approach
Start with your three best-selling measured products. Publish, run the test checklist below, and watch for support questions about quantity over a few weeks. If the calculator removes guesswork, expand to more products on a plan that supports them. If it doesn't fit, you've spent an afternoon, not a migration.
Setup checklist before you publish
- Confirm coverage per package and unit. Check the box or roll coverage against the manufacturer's spec, and make sure the unit matches (sq ft vs sq m).
- Set the waste and rounding rule. Pick a waste percentage that matches how you advise customers, and round up so shoppers never end up short.
- Test limits and cart quantity edits. Try a tiny room, a huge room, and a shopper changing the quantity in the cart. Confirm coverage updates.
- Check the mobile product page. Most flooring and tile shoppers browse on a phone. Make sure the inputs and results are readable.
- Run your hand-math cases. Use the 12 x 14 ft example: if you don't get 10 boxes, something is configured wrong.
For a longer list, use this 7-point flooring calculator test checklist.
If you sell by area, length or package, you can install Shoperize Price Calculator and try the Free plan on up to three products (details at https://calculator.shoperize.com). Setup help is at https://help.shoperize.com.
Frequently Asked Questions
Is there an app that can calculate product prices?
Yes, several Shopify apps do. Some compute a price from a formula such as width x height x rate, while others, like Shoperize Price Calculator, convert a measurement into a purchasable quantity and let the Shopify catalog price set the charge. Choose based on whether you sell free-form sizes or fixed packages.
How much does Shopify take from a $20 sale?
It depends on your Shopify plan and your payment gateway, since fees typically combine a percentage and a fixed amount per transaction and can change. Check Shopify's official pricing page for the current rates on your plan rather than relying on a fixed figure.
Is there a Shopify app that can create sizing charts?
Yes, sizing chart apps exist, mostly for apparel and footwear. They are a different category from price calculators, and Shoperize Price Calculator is not a sizing chart app. It turns area, length, volume or weight into purchasable quantities.
Can you make 10k a month on Shopify?
Some stores do, but no app or plan guarantees it. It depends on your margins, traffic, average order value and repeat purchases. A calculator can help by reducing wrong-quantity orders and support questions, but it won't create demand by itself.
Does the calculator change the product price at checkout?
No. The calculator sets the quantity, and Shopify charges the catalog price times that quantity. Discount codes, taxes and reports keep working on normal line items.