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Plugin · Size calculator

Answer the question every enquiry starts with.

How much space do I need? Most storage sites answer that with a size chart and hope. This calculator turns one slider into a straight answer: the space, what it holds, and the unit you actually have free at that site.

Size CalculatorLive
One-bedroom flatTransit van
50 ft² unit
Closest available unit: Medium · £95.00/month
Get a quote →
The problem

Almost nobody knows what 50 sq ft looks like. So customers guess, and a guess goes one of two ways: they book too small and leave frustrated, or they stall on the size question and never finish the enquiry at all. A size chart alone does not settle it, because it asks the customer to do the translating.

14sizes
One slider, fourteen sizes
matched to your real stock
Capabilities

What it does

Three ways to picture it

Space size, van load and box count move together, and the customer can slide by whichever one they actually understand.

Matched to real stock

Every size resolves to the smallest unit you have free at that location, so the answer is never a unit you cannot sell.

Nothing fits? Still a lead

When the size is bigger than anything free, it captures a callback request instead of showing a dead end.

See it in action

One slider. A real answer.

Drag it. The comparisons move together, the recommendation names a unit you actually have, and the quote button carries the size straight through to the booking form. This is the live plugin, running on this page.

Storage Size Calculator · live on this site
The live plugin, running on this site with demo units. On your site it runs against your own sizes, prices and locations.
Features

Built for storage sites

Real-world comparisons

Every size is described as a room, a vehicle load and a number of boxes, so nobody has to picture square feet.

Availability aware

Recommendations come from the units you actually have free at that site, not a generic list.

Size guide included

A full size table, generated from the same list the slider uses, so the guide and the calculator can never disagree.

Drops in anywhere

Shortcode, block or Elementor widget. Identical output from all three, and no page builder required.

Fully brandable

Colours, button shape and every line of copy are settings, so it takes your branding rather than ours.

Sq ft or sq m

Set the default and let the visitor switch. Their choice is remembered while they browse.

Running on this page

The calculator above is the plugin itself, not a screenshot or a mockup.

Live
Behind the scenes

You set the sizes. It matches the stock.

The sizes on the slider and the units you rent are two separate lists, kept deliberately apart. You edit both in WordPress, and the plugin reconciles them on every render, so a small site still gets a smooth slider and never recommends a unit it cannot let.

Storage Unit Booking · EnquiriesView all
CustomerSizeMove-inStatus
Sarah Patelsarah.patel@example.com50 sq ftMedium14 JunNew
James Okaforjames.okafor@example.com25 sq ftSmall21 JunFollowing up
Mia Donnellymia.donnelly@example.com300 sq ftCallback, nothing free1 JulBooked
Developer hooks on every enquiry Fire your own code to push each one wherever it needs to go.
Settings
Brand colours
Default size unitsq ft · visitor can switch
Show a from price
Show what fits
Quote button goes tobooking form · or your own system
  • Your sizes, your words: every size, comparison and description is editable, with UK defaults to start from.
  • Every enquiry captured: name, contact, size and move-in date, stored in WordPress and emailed to you.
  • Or skip the form entirely: point the quote button straight at the booking system you already run.

Want this on your storage site?

We’ll set it up against your own unit sizes, prices and locations, in your branding, or build something bespoke around how you work.

What clients say

Real reviews from real clients.

★★★★★ Rated 5.0 on Google
★★★★★

The team is very supportive, creative and organised when it comes to our marketing calendar. They take our views and needs into account and always find a way to 'translate' them into marketing terms.

Happy Tree Happy Tree Academy
★★★★★

Amazing experience with Amax Marketing! They built my self storage website and the process from start to finish was first class. I highly recommend them!

Grant Daniel Store Secure
★★★★★

We found Rahul and Terence to be knowledgeable, friendly and very helpful. When we have issues with our emails or website their response time has been very impressive, fixing the issue in great time.

Damian Mulhern Shield Self Storage
★★★★★

We've been working with the Amax team for a few years now for all things web design and development. Rahul, Naveed and Terence helped us build our website, set up pages with dynamic features, and source an event photographer. The communication is seamless and they're quick to troubleshoot. Great work!

Celia Illes ICFS
★★★★★

We worked with Amax to redesign the Sheeplands Self Storage website in 2024 and the whole experience was brilliant from start to finish. The team were helpful, communicative, and made the process really straightforward. They also hosted our site for a couple of years.

Sophie Baker Sheeplands Storage
★★★★★

I honestly cannot recommend this company enough. From the start, Rahul and Terence have been brilliant to work with. Communication has been excellent throughout, with quick responses, regular updates and a WhatsApp group that made everything really easy.

Idris Purple Monkey Self Storage
★★★★★

Strong knowledge, results-driven. Worked with Amax for nearly 3 years now, results keep moving in the right direction. Recommend!

Elyas Coutts Client
★★★★★

I've worked with Amax for several months now and I've been super impressed by their attention to detail, dedication, approachability and professionalism. Would highly recommend them.

Laura Alderson JF Hudson
★★★★★

Amazing experience with Amax.

InDesign Showroom London InDesign Showroom
★★★★★

We had a great experience working with Amax Marketing. Rahul, Terence and Christopher were extremely helpful and responsive throughout, making everything very straightforward. Nothing was too much trouble. We're really pleased with the final result and would highly recommend them.

MidWales Storage Self storage
★★★★★

Our experience with Amax has been fantastic. They made us a fantastic website for our self storage site to operate from. The response on tasks and customer care has been brilliant. Truly a 10/10 business to work with!

George Goodson Self storage
★★★★★

Professional, quick and friendly service, delivering exactly what was requested and on time. Couldn't have asked for more! Very happy with the results and to work with the whole team. Cheers guys!

Samer Ebbini Client
★★★★★

We've worked with Amax for the past few years and have a great, collaborative relationship. Their communication has been fantastic and they're always open to new ideas, delivering on what they say they'll do with quick turnarounds.

Joshua Webb Client
★★★★★

We're thrilled with the website Amax Marketing created for Orange Box Self Storage. It's professional, visually stunning, and perfectly optimised for SEO. Their customer service has been outstanding, always responsive and genuinely invested in our success. We can't wait to continue our partnership with ongoing SEO and PPC campaigns.

Binder B Orange Box Self Storage
★★★★★

Rahul and the AMAX team have been working on our website for the last couple of months, and I have been very impressed with the results! They have been re-designing parts of the site and adding SEO, and we've had a lot more traffic to the site as a result. We look forward to seeing even more results in the future!

Emily Bibb Client
★★★★★

Rahul and his team have recently begun re-designing and re-building our website in preparation for SEO work, and so far it has been fantastic! Really impressed with how quickly they got to grips with what we're about and what we want to achieve. Excited to see the final result!

Sean Kelly Client
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