Builder-Calc is an independent website with construction calculators for practical building tasks. We create fast and easy-to-use tools for calculating materials, dimensions, and structural parameters.
The project began as a practical collection of personal calculators for everyday tasks: how much mix to use on a site, what slope to choose, how to calculate the weight of metal, how to lay deck boards. The tools proved useful to other craftsmen, so we've collected them in one place, streamlined the interface, and made them available to everyone.
Today, our goal is for every user to receive accurate figures in minutes without registration, unnecessary clicks, or hidden restrictions. We're gradually adding languages, improving tooltips, and refining formulas based on real user questions.
Oleksandr coordinates Builder-Calc, defines requirements based on user feedback, and ensures consistency in the interface, logic, and quality of the calculators.
Igor Sikorsky Kyiv Polytechnic Institute - Faculty of Informatics and Computer Science (FIOT).
Led small engineering teams on data-driven web apps; introduced lightweight release checklists and usability reviews now applied to every calculator.
Maksym designs roofing tools with a focus on practical site decisions: slope choice, rafter span, spacing, and material take-off.
Kyiv National University of Construction and Architecture - Faculty of Civil Engineering.
Worked with small contractors on private houses and light roofs; focuses on inputs clarity and unit switching for roof calculators.
Iryna develops calculators for foundations and slabs, keeping inputs realistic for small projects and renovations.
Odessa State Academy of Civil Engineering and Architecture - Civil Engineering, specialization Geotechnics.
Former site engineer for small foundations and floors; moved to tooling and documentation to reduce on-site miscalculations.
Maintains metal weight and section tools, aligning densities and section data with common Ukrainian standards.
Ukrainian State University of Science and Technologies (Dnipro) - Dnipro Metallurgical Institute, Department of Metal Forming.
Experience in stock calculations and estimating; now optimizes our section database and export formats.
Focuses on stair geometry that meets comfort and code-like proportions for typical homes and small public spaces.
Lviv Polytechnic National University - Institute of Building and Environmental Engineering.
Designed stair solutions for renovation projects; translates common rules into clear inputs and outputs.
Builds tools for timber and common building materials, focusing on cut plans and waste reduction.
Kyiv National University of Construction and Architecture - Faculty of Technology of Building Materials.
Worked with suppliers and builders to align catalog sizes with real-world dimensions; maintains our material presets.
Translates structural rules of thumb into conservative calculators for small structures.
Prydniprovska State Academy of Civil Engineering and Architecture - Faculty of Civil and Industrial Engineering.
Former structural designer assistant; focuses on safe defaults and clear warnings.
Creates simple, practical tools for household and small commercial electrical tasks.
Igor Sikorsky Kyiv Polytechnic Institute - Faculty of Electric Power Engineering and Automatics (FEA/FEPEA).
Worked alongside installers; adapts rules into calculator-friendly inputs with clear outputs.
Keeps wall-related calculators focused on applicability limits and material options.
Kharkiv National University of Civil Engineering and Architecture - Civil Engineering.
Experience with small residential masonry jobs; curates presets for common wall types.
Builds tools for insulation and envelopes, keeping inputs realistic and units consistent.
Kharkiv National University of Civil Engineering and Architecture - Heat and Gas Supply and Ventilation.
Worked with retrofit teams on energy saving; standardizes our insulation presets and examples.
Maintains geometric and conversion tools: angles, areas, volumes, and quick trigonometry for the job site.
Taras Shevchenko National University of Kyiv - Faculty of Mechanics and Mathematics.
Tutored math for engineering students; turns typical geometry tasks into quick calculators.
Found an error in a calculator or have a question? Leave a message - we read everything.
To provide clear and accurate calculations for real-world jobs - quickly, free of charge, and without unnecessary theory.
Our calculators provide engineering-related estimates for planning and comparison. They are not a substitute for project design, code compliance checks, or professional supervision.