Methodology

How CalculatorGarage Builds a Calculator

Each tool is developed as a small, testable model: defined inputs, unit-consistent math, documented formulas, and explicit outputs. Wherever estimates are involved (for example, drivetrain loss or rolling diameter variance), the model states assumptions and boundary conditions.

1) Define Inputs and Units

Inputs are constrained to realistic ranges and converted to consistent base units before calculations run. This prevents silent unit mismatch and produces comparable results across vehicle platforms.

• Variable isolation: each input affects only the parts of the formula it should.
• Unit normalization: conversions happen before computation, not after.
• Range controls: invalid or extreme values are flagged or bounded.

2) Use Documented Formulas

Formulas are presented in plain language and tied to the exact variables used in the calculator. If a calculator uses a derived value (for example, tire diameter from size format), that derivation is shown.

• Formula transparency: what is computed and why is visible to the user.
• Worked examples: sample inputs and outputs demonstrate expected behavior.
• Assumption disclosure: model assumptions are stated where they materially affect results.

3) Validate and Cross-Verify

Models are checked against real-world mechanical scenarios, published references where applicable, and internal test cases spanning typical and edge input ranges.

• Scenario validation: results are compared against known mechanical behavior and constraints.
• Input sweeps: multiple ranges are tested to catch instability and discontinuities.
• Edge handling: divide-by-zero, negative, and out-of-range conditions are handled explicitly.

4) Revision Tracking

When formulas or assumptions change, the calculator is updated with a documented revision note so results remain traceable over time. This keeps models defensible as data and standards evolve.