How ProjectFigures Calculators Work

Your figures are the input authority

Measurements, prices, rates, payroll figures and other project inputs come from you. ProjectFigures does not silently substitute a national-average price when a calculator is designed to use your supplier or business figure.

Deterministic formulas, explicit units

Each calculator has a defined scope for its inputs, formula semantics, unit handling and outputs. Supported unit conversions use defined conversion rules so the same valid inputs produce the same calculation result.

The calculator-specific methodology, assumptions and limits shown on each tool remain authoritative for that calculator because not every project uses the same geometry, rounding or purchase-planning rules.

Waste, extra and overage stay visible

When a calculator supports waste, extra allowance, overage, contingency or another planning adjustment, ProjectFigures keeps that choice explicit instead of burying it in an unexplained multiplier.

Likewise, density, coverage, package size, stock length, margin and similar inputs are shown when they materially affect the result.

Whole-count planning is calculator-specific

When a tool promises countable purchase units such as bags, packages, boards or panels, its engine uses the whole-unit behavior defined for that calculator. A quantity estimate and a purchase count are kept conceptually separate when the product requires that distinction.

Invalid inputs do not become invented answers

Calculator engines use validation and numeric-safety rules to reject missing, unsupported or unsafe values instead of intentionally manufacturing a plausible-looking result. The exact accepted ranges and validation rules vary by calculator.

A planning estimate is not site reality

ProjectFigures outputs are planning aids. Real purchase quantities, supplier packaging, waste, labor productivity, site conditions, structural requirements, code obligations and contract terms can change what a project actually needs.

Verify important decisions against the calculator's stated assumptions and, when the work requires it, against suppliers, plans, local requirements and qualified professionals.

Testing and release review

The project uses automated regression and release checks for calculator behavior, route metadata, build integrity and selected browser interactions. Those checks help prevent regressions; they are not an external certification and do not guarantee that every result fits every real-world project.