If you sell anything without a fixed price, you have had this conversation with yourself a few times: I should put a calculator on the site. Then you looked at what’s out there, found thirty plugins that appear to do the same thing, and put it off.
Putting it off was reasonable. The trouble is that „price calculator” describes four completely different things, and those thirty plugins only do one of them. Choose from the wrong category and you lose a weekend to end up with a form that doesn’t do what you wanted.
Below are the four, with what each really costs — and the real cost is almost never the licence.
First: what do you want to happen at the end?
Before any tool, answer three questions. They decide your category on their own.
- Does the customer pay on the spot, or ask for a quote? If you take money online you need a basket and payments. If you don’t, a basket is a complication you maintain for nothing.
- Does the price come from dimensions, or from ticked options? „Area × rate” and „medium package plus two extras” are different arithmetic, and tools tend to be good at one of them.
- Does it matter that the customer sees what he configured? Selling a service, no. Selling a physical object made to size, it is often the difference between a request and a visit to your competitor’s page.
Option 1. A form with a formula
The crowded category. There are dozens of cost calculator plugins — Cost Calculator Builder, Stylish Cost Calculator, several more on CodeCanyon — all built around the same idea: you place fields in a form, write a formula between them, and the plugin shows the result.
Most have a serious free version, a drag-and-drop builder, and dozens of ready-made templates for services: cleaning, transport, renovation, printing, rentals.
When it’s the right choice
- You sell a service, not an object.
- The price comes out of a formula you can write on one line.
- Your customer needs a number, not a picture.
Where it bites
They are forms. A form does not draw. If your product has a shape, the customer fills in figures without ever seeing what he is buying — so the calculator gives him a price, but it doesn’t give him confidence.
The second limit shows up with rules that don’t fit in a formula: minimum order, quantity thresholds, rates that change past a certain size. All doable with the conditional logic in the paid tiers, but maintaining it becomes a project in itself.
The real cost is not the licence. It’s the afternoon spent learning the builder, and the evening you discover your minimum-order rule can’t be expressed. Set aside a day, not an hour.
Option 2. WooCommerce with variations
If you want to take payment online, this is the well-trodden road. WooCommerce is free, every developer knows it, and for made-to-measure you add an extra-fields plugin that multiplies width by height by a rate.
When it’s the right choice
- You want payment on the spot, not a conversation.
- You already run a shop with a working order flow.
- Your products have a sane number of combinations.
Where it bites
WooCommerce is built for products that exist in stock. A 2,150 × 1,750 mm panel does not exist until you make it. You can talk it into working, and plenty do, but you end up maintaining an entire shop — payments, tax, stock, order emails — in order to get a calculator.
Plus the question worth asking early: do you actually want someone buying without speaking to you? For anything installed on site, an order paid without a conversation is often an order you will be the one to cancel.
Option 3. Built to order
You hire someone to write exactly what you want. It comes out exactly as you wanted, first time.
Where it bites
Not on price — on what happens afterwards. Eight months later you change your rates. Who edits it? If the answer is „I ring that lad”, you have bought a product with one key, and someone else is holding it.
The question to ask before signing isn’t what it costs. It’s: can I change my own prices without ringing anyone? If not, the figure in the quote is only the deposit.
Option 4. A configurator that draws
One difference from option 1, and it changes everything: alongside the price, the customer sees a drawing of what he configured, to scale, dimensioned. He drags a slider and both the figure and the shape move.
This category is far thinner, because a drawing cannot be generic. A form with a formula can calculate anything, from a pizza to a mortgage. A drawing has to know what it’s drawing.
When it’s the right choice
- You sell a physical object made to size: fences, blinds, joinery, furniture, glass, terrace covers, railings.
- Your customer isn’t a specialist and can’t picture it from numbers.
- You want the request to arrive with the full specification, not „how much for a gate?”.
Where it bites
It is specialised by definition. If your product looks nothing like what it knows how to draw, it is no use to you — and it’s fairer to find that out before, not after.
Choosing, briefly
| Your situation | What to take |
|---|---|
| A service, priced by formula | Form with a formula (option 1) |
| Payment online, products in stock | WooCommerce (option 2) |
| Rules nobody else has | Built to order (option 3) |
| Physical object, sold by the millimetre | Configurator that draws (option 4) |
What it really costs, whichever you pick
Not the licence. Three things, in the order they catch people out:
Your rates. Every tool asks for your own numbers, and most people find out at that moment that they aren’t written down anywhere — they’re in your head, with exceptions you apply by instinct. Writing them out takes longer than the install. The most reliable method: take two recent jobs of different sizes, put them through the calculator, and adjust rates until both totals land where the invoices did. If one fits and the other doesn’t, the difference is nearly always the fixed part — the cost that doesn’t grow with size, and that nobody thinks to write down.
The nerve to show a price at all. This is the real obstacle, not the technology. The fear is that competitors will see your prices. The reality is that they see them anyway, by asking for a quote like any other customer. What you lose by hiding them are the people who couldn’t be bothered to ask.
What you do with the requests. A calculator that works brings you more enquiries, not fewer. If you currently answer in two days, a calculator only makes the pile taller.
A five-minute test, before you install anything. Take the last quote you sent. Write down the formula that would have produced that number — every line, including the fixed part. If it comes out, any tool above will work for you. If it doesn’t, no tool saves you, and the website was never the problem.
Why I’m writing this
I run a fence and gate workshop outside Bucharest, and I worked through three of the four options in the wrong order. I ended up at the fourth because my product has a shape, and my customers can’t picture it from numbers.
The configurator I built for my own workshop is now a free WordPress plugin that runs on your site. You can try it in the demo before downloading anything, and if you want to see how it’s set up, it’s on the front page.
But if what you took from this article is that option 1 suits you, take option 1. Better to lose a reader than to cost him a day.
Not sure which category you’re in? Tell me what you sell and how you work the price out today. I’ll tell you which option you’re in, even when it isn’t mine. contact@univers-all.eu
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