Business calculators and web tools for calculations

Service Format

Problem

Calculations live in Excel, PDF instructions, or employees' heads: cost, delivery, discounts, and exceptions are handled manually and easily produce errors.

Solution

I design a web calculator or calculation API around your rules: formulas, reference data, constraints, hints, and integration with the website or back office.

Result

Your team and customers get one calculation flow: faster answers, fewer errors, and transparent logic instead of scattered spreadsheets.

Timeline

After the brief, we review rules and test examples. First comes the calculation core, then the interface, API, and validation on real scenarios.

Collaboration Format

You send rules, calculation examples, and constraints → I formalize the logic → build a prototype → we verify results → launch the working version.

Start with the brief

How It Works in Practice

A business calculator is useful when calculation depends on many parameters, reference tables, and exceptions. It can be a customer-facing widget, an internal tool for managers, or an API that calculates cost inside an online store.

When This Is Relevant

Managers calculate prices manually in Excel, and results differ between employees.
There are tariffs, discounts, seasonal limits, regions, coefficients, or other exceptions.
Customers need a quick preliminary estimate on the website without messaging a manager.
An internal system needs a calculation API for orders, delivery, estimates, or condition checks.

What I Do in the Project

I analyze current calculation rules and translate them into formal logic.
I build the calculation core: formulas, reference data, conditions, constraints, and checks.
I create a web interface for customers or back office users: fields, hints, results, and clear errors.
When needed, I add an API so the calculator can connect to a website, CRM, or online store.

What You Receive

A working web calculator or calculation API for a specific business process.
Verified test examples to compare results with your current rules.
Clear logic for updating tariffs, coefficients, and reference data.
Development recommendations: saved calculations, exports, integrations, analytics, and error control.

We usually start with real calculations: valid input, expected result, and disputed exceptions. This quickly shows where the logic is already formalized and where it needs to be carefully reconstructed from documents and practice.