Custom calculators for your website that bring search traffic and leads

• ·Your customers do a calculation before buying: an installment, a payroll cost, a solar panel estimate, shipping, the amount of material.
• ·Your team runs that calculation by hand, over and over, by email or WhatsApp.
• ·The logic lives in a spreadsheet that only works on one computer.
• ·You publish content for search and want a page that people link to and come back to.

Search results for calculator queries are full of look-alike pages that get edge cases wrong and bury the result under ads. Your customers use them anyway and leave with someone else’s brand in mind.

An AI chat can explain the formula. It can’t give your customer an exact, repeatable result on your page, with your rules and a next step.

The hard part is the rules: tables that change every year, rounding, dates and holidays, the input nobody tested. Those need to be written down, tested and kept current.

Each person who does the math on another site is a visit, and maybe a customer, that never reached you.

Every quote your team calculates by hand is time spent on work a page could do, often for people who aren’t ready to buy yet.

A calculator with a wrong result does more harm than no calculator, especially on money, taxes or health.

• ·People who search for the calculation land on your site and see your brand next to the answer.
• ·The result ends with a next step: get it by email, talk on WhatsApp, ask for a quote.
• ·Your team gets leads who already did the math, with their inputs attached.

1. 01The tool on your site, as its own page or inside an existing one, on WordPress, Shopify, Wix, Webflow or custom code.
2. 02The rules written down with their sources, and automated tests for the calculation, edge cases included.
3. 03A page built to rank: explanation, FAQ and search metadata around the tool.
4. 04Lead capture where it fits: email the result, a WhatsApp button, booking, or sending the inputs to your CRM.
5. 05Shareable results: a link that reopens with the same inputs, and a printable summary.
6. 06Tracking for usage and leads.

1. Step 1: 01

   Short

   The question

   Which search or customer question the tool answers, and what should happen after the result.

2. Step 2: 02

   Before any screen

   The rules

   Formulas, tables, sources and edge cases written down and agreed. For regulated calculations, your specialist signs off.

3. Step 3: 03

   Most of the project

   Build and test

   The calculation first, with tests, then the interface, on a preview link.

4. Step 4: 04

   Short

   Publish

   The page, tracking and lead capture live on your domain.

5. Step 5: 05

   Optional

   Upkeep

   Updates when the inputs change, such as a new year’s tax table.

• ·The calculation or spreadsheet you use today, and the person on your team who can check it.
• ·The source for every official figure: tax tables, rates, regulations.
• ·Brand assets and the page where the tool will live.
• ·What the visitor should do after seeing the result.

Tools on this site you can use now, free and without signing up.

• All free toolsOn this site

  More than 300 calculators, converters and generators in English and Portuguese. They bring search traffic to this site.

• 13th salary calculatorOn this site

  Brazilian 13th salary with the 2026 INSS table and income tax rules, every deduction shown step by step.

• Pix QR code generatorOn this site

  Builds the Pix payment code defined by Brazil’s central bank, checksum included, entirely in the browser.

• CPF validatorOn this site

  Checks a Brazilian taxpayer number with the official check-digit rule, entirely in the browser.

How much does a custom calculator cost?

It depends on how complex the rules are, whether the tool captures leads or connects to a CRM, and how many languages it needs. Adapting one of the tools on this site is the cheapest route. Send a brief and you get a written proposal with the price before work starts.

How long does it take?

The rules take the most time, so a calculation that is already clear in a spreadsheet moves faster. Adapting an existing tool from this site is the quickest path. The proposal gives dates for your scope.

My site runs on WordPress, Wix or Shopify. Will it work there?

Yes. On any platform it goes in as an embed you paste like a video or a map, and on a React or Next.js site it goes in as a component. It can also live on its own page under your domain.

We already have a developer. Why not build it in-house?

You can. What I bring is having built more than 300 of these: the rules document, tests for edge cases, the search page around the tool and the lead capture. I can also hand your developer the tested calculation to plug into your site.

What if it doesn’t bring traffic?

Rankings depend on the query, the competition and your domain, so nobody can promise one. I pick the question with you based on what people search for and what already ranks. From day one the tool also does its other job: answering your customers’ calculation on your site, with a next step.