Tank sizing calculator
Roof area, local rainfall and usage turned into a clear tank recommendation customers can trust.
Water tank sizing calculator & quoting software
Water tank installers: size the tank from the rain. Roof, rainfall and price in one.
Customers guess the size or ring you for advice. Quotes wait for a callback and delivery runs get planned on a whiteboard. We build tank sizing tools, online quoting and delivery and install scheduling that turn website visitors into booked jobs. Then we host it all and look after it.
Looking for a water tank size calculator and quoting system for your website?
The first question is always 'what size tank do I need?' Most customers have no idea how big their roof is or how much rain they get. So they guess, buy too small or ring you for a half-hour chat that may never turn into a sale. Then there's the pump they forgot, the pad that isn't level and the truck that can't fit down the driveway.
Wollopit builds custom software for water tank businesses around how you actually sell, deliver and install. A sizing tool works from roof area, local rainfall and household usage to recommend the right tank. The quote includes the pump, fittings, base and install. Deliveries get grouped into sensible runs and crews get the job on their phones. We connect the tools you already use and look after the lot on our own servers.
01The problems
What we hear from water tank installers
Does your water tank business have these problems? Here's how we'd fix them.
Most tank businesses sell a good product and lose hours to the same phone calls, missed extras and wasted truck trips. Here's where it usually hurts.
- The problemCustomers don't know what size they needPeople guess, buy too small and the tank's dry by October. Or they ring you for advice that eats half your afternoon.How we fix itA sizing tool on your website using roof area, local rainfall by postcode and household usage. It ends in a recommendation and a quote.
- The problemEvery quote needs a phone callA price means a callback, a few site questions and an email that goes out two days later. By then they've bought elsewhere.How we fix itTank, pump, base and install priced online from the options they pick. You can check it before it sends if you'd rather.
- The problemPumps and fittings forgottenThe tank arrives and the customer realises they need a pump, a first flush diverter and a tap to actually use it.How we fix itPumps, diverters, leaf eaters, taps and overflow fittings suggested with each tank based on how they'll use the water.
- The problemBase prep isn't readyThe truck turns up to an unlevel pad, a slab that's still curing or no base at all.How we fix itBase options chosen at quote time with prep instructions sent ahead. A photo check of the pad happens before delivery is confirmed.
- The problemDelivery runs planned by phoneRinging round to line up drop-offs while trucks head out half empty to opposite ends of the region.How we fix itDeliveries grouped by area and day. Customers pick a window that suits the run and get an SMS when the truck is on its way.
- The problemAccess surprises on delivery daySteep driveway, narrow gate, power lines over the spot. Nobody mentioned it until the truck was there.How we fix itSite access questions and photos collected at booking so you know about the tricky ones before the truck leaves the yard.
- The problemRebate questions you answer every dayCustomers want to know about council and water authority rebates and you explain it again for the tenth time this week.How we fix itRebate and council info by area shown with each option, based on the details you load in and keep current.
- The problemInstall crews juggled by textDelivery, install, plumbing connection and pump wiring all lined up through a chain of texts and phone calls.How we fix itOne schedule for every stage of the job, on crew phones with addresses, photos, checklists and customer sign-off.
- The problemRural orders are a quoting marathonMultiple tanks, stock troughs, fire fighting reserves and long pipe runs take an hour of spreadsheet work to price.How we fix itMulti-tank rural quotes with fire fighting outlets, pressure pumps, trough feeds and freight by distance worked out for you.
- The problemSelling stock you haven't gotA customer orders a colour or size that's weeks away from the manufacturer and nobody told them.How we fix itStock and lead times by size and colour, so quotes show a realistic delivery date from the start.
- The problemWarranty and service forgottenWarranty details lost in an inbox. Nobody reminds the customer to service the pump or clean the gutters.How we fix itWarranty records saved per job with automatic reminders for pump services, tank cleans and gutter checks.
02What we build
Solutions
What we build for water tank installers. Usually all talking to each other.
Pick the one that's hurting most or join the whole lot up. Everything is built around how your team works, not the other way round.
Roof area measuring
Customers draw their roof on a satellite map or enter dimensions. No tape measure on the ladder.
Online quoting
Tanks, pumps, fittings, bases and installs priced instantly with options to add or remove.
Accessory suggestions
Pumps, diverters, leaf eaters, taps and overflow kits offered based on the setup they need.
Base prep booking
Sand pad, crusher dust or slab options with instructions, photo checks and booked concreters.
Delivery scheduling
Deliveries grouped by area and day, with time windows and on-the-way SMS.
Site access checklist
Driveway, gate width, slope and overhead lines captured with photos before the truck is booked.
Install job management
Delivery, install, plumbing and pump hookup scheduled with job sheets on crew phones.
Rebate guidance
Council and water authority rebate info shown by area alongside each option.
Rural and multi-tank quotes
Several tanks, fire fighting reserves, stock troughs and freight by distance in one quote.
Stock and lead times
Sizes and colours in stock or on order, so delivery dates are honest from day one.
Warranty and service reminders
Warranty records per job and reminders for pump services, tank cleans and gutter checks.
A website that sells tanks
Fast on mobile with the sizing tool front and centre, built to rank for 'water tanks' plus your region.
03The systems
The big ones
Your whole tank business, on one system.
These are the systems tank businesses ask us about most. Each one works on its own and they get properly clever when they're joined up.
Tank sizing tool
Answer 'what size tank?' before they pick up the phone.
Customers measure their roof on a map, pop in their postcode and tell us how they'll use the water. The tool works out how much they can catch and how much they'll use, then recommends the right tank and hands you a qualified lead.
- Roof drawn on a satellite map
- Or roof dimensions entered by hand
- Rainfall averages by postcode
- Household, garden and stock usage
- Dry month coverage shown clearly
- Recommended size plus a step up option
- Round, slimline and underground options
- Straight into a quote
- Lead details sent to you instantly
- Built in your branding on your website
Online quoting
A full quote while they're still on your website.
Tank, pump, fittings, base and install priced together from your own price list. Customers see what they're paying for and can add the extras they'd otherwise forget. You can approve quotes first or let them book and pay a deposit straight away.
- Your price list for tanks and colours
- Pumps and fittings suggested
- Base and install options
- Freight by distance or zone
- Rebate info shown by area
- Deposits by card through Stripe
- Approve before send if you prefer
- Quote follow-up SMS and emails
- Accepted quotes into Xero or MYOB
- Rural and multi-tank quotes
Delivery & install
Fuller trucks. Fewer wasted trips.
Deliveries get grouped by area and day so the truck does sensible loops. Customers choose a window on a run that's already heading their way. Install crews see every job on their phones with access notes, photos and what's going in.
- Delivery runs grouped by area
- Customers pick a window on a run
- On-the-way SMS to customers
- Access notes and site photos
- Install, plumbing and pump stages
- Job sheets on crew phones
- Photos and sign-off on completion
- Works with ServiceM8 or Tradify
- Google Calendar for the office
- Run sheets for the driver
Site & base prep
No more trucks turned away at the gate.
Every job collects site access details and photos before delivery is booked. Base options come with clear prep instructions and a quick photo check of the pad. Your crew knows exactly what they're walking into.
- Driveway, gate and slope questions
- Overhead lines and trees flagged
- Customer site photos at booking
- Sand pad, crusher dust or slab
- Prep instructions sent automatically
- Pad photo check before delivery
- Concreter or base crew booking
- Reminders before delivery day
- Flags for hard access jobs
Aftercare & warranty
Customers who come back for the next tank.
Warranty details are saved against every job so you can find them in seconds. Customers get reminders to service the pump, clean the tank and check the gutters. That keeps their water clean and keeps you front of mind when they need a second tank.
- Warranty records per job
- Serial numbers and install photos
- Pump service reminders
- Tank clean reminders
- Gutter and screen check reminders
- Repair and service bookings
- Google review requests after install
- Customer history at a glance
04How it changes
Before and after
A rural tank order, wolloped.
Here's how a typical tank sale could change. Every business is different, so we map yours first.
Before
- 'What size do I need?' phone call at dinner time
- Guessing roof area from the customer's description
- Quote emailed the next day
- Customer forgets they need a pump
- Delivery arranged over three phone calls
- Truck arrives to an unlevel pad
After
- Sizing tool recommends a 22,500L tank
- Roof measured on a satellite map
- Price shown instantly with install included
- Pump and diverter added at checkout
- Delivery window booked on the Tuesday run
- Pad photo approved before the truck leaves
05Services
Everything under one roof
Software, websites and systems for water tank installers.
Whether you're starting fresh or upgrading what you've got, it's one team from the first sketch to the support call.
Custom software for water tank installers
Built around how your water tank business actually runs: tank sizing calculator, roof area measuring and the admin in between, in one system you own.
Websites for water tank installers
Fast, hand-built websites that rank for the searches your customers make and turn visits into enquiries, bookings or orders.
Water tank business system upgrades
Running on spreadsheets, old software or a platform you've outgrown? We move your data across and upgrade in stages so the business never stops.
Apps and portals for water tank installers
Online quoting and accessory suggestions: customer and staff portals that work on any phone without an app store.
Integrations and automation
We connect Xero, MYOB and ServiceM8 so information moves on its own and nobody retypes it.
Hosting, support and care
Managed hosting, updates, backups and security for your water tank business, looked after by the people who built it.
06Integrations
Connections
Plays nicely with what you already use.
We connect to the tools you rely on, work alongside job management apps you're happy with or replace the ones holding you back.
- Xero
- MYOB
- ServiceM8
- Tradify
- simPRO
- Stripe
- Square
- Afterpay
- Google Calendar
- Google Maps
- Twilio SMS
- Google Business Profile
- Bureau of Meteorology data
- Shopify
- WooCommerce
- Mailchimp
07How we work
The process
Some people dip their toe in. We turn up in a rebreather.
We get properly below the surface of your water tank business: the systems, the busy days and the jobs everyone hates. Then we fix the bits that matter most first.
- 01
Think
We spend time in the yard, on the phones and out on a delivery run, then work out where the hours and the sales are going.
- 02
Archi-tech
We plan it before writing code: your tank range, pricing, sizing logic, delivery areas, crews, hosting and cost.
- 03
Build
Real engineering, shown to you early and often. Usually the sizing tool and quoting first, so the website starts bringing in better leads quickly.
- 04
Look after
We host it, maintain it and keep improving it. When something breaks you call the people who built it.
08Questions
FAQ
Things water tank installers ask us.
Something else on your mind? Ring 0423 011 252 and ask the people who'd build it.
Can the calculator use local rainfall data?
Yes. We use rainfall averages by postcode so recommendations suit the customer's area. A tank in a wet coastal spot works out very differently to one out west.
Can customers measure their own roof?
Yes. They can trace their roof on a satellite map or type in the dimensions. Either way the tool works out the catchment area for them.
Can it price pumps, bases and installs too?
Yes. Quotes are built from your own price list, so tanks, pumps, fittings, bases, freight and installs all come through together.
Can I check quotes before they go out?
Yes. You can approve every quote first or let simple ones go straight through with a deposit. It's your call and you can change it anytime.
Do we have to switch from ServiceM8 or Tradify?
No. If your job management app is doing its job we build around it. Sizing, quoting and delivery runs sit on top and push jobs into what you already use.
How much does it cost?
It depends on what you need, so we quote up front once we understand it. No surprise invoices, no lock-in and you own what we build.
How long does it take?
A sizing tool and online quote can be quick. Bigger systems are planned in stages so you get the first win early instead of waiting for everything at once.
Who looks after it once it's built?
We do. We host it on our own managed servers and keep it updated and secure. When you need a change you ring the people who built it.
We already have systems. Can you upgrade them instead of starting again?
Usually, yes. Most water tank installers we work with keep what's working and upgrade the rest in stages. We move your data across, connect the old and new while we switch and retire the old system only when the new one is proven.
Contact
Got a water tank business problem? Consider it wolloped.
Tell us what's slow, broken, manual or missing. You don't need a spec, just describe what's going on.