Calculation Methodology

CalcVo separates calculation logic from presentation. All numeric results come from a pure TypeScript engine with zero React dependencies — the same code paths power calculators, share links, and embeds.

Engine architecture

• Money: Standard amortization, compound interest, PMI estimation
• Health: WHO BMI categories, Mifflin-St Jeor BMR/TDEE
• Education: Credit-weighted GPA, multi-scale conversion
• Date: Calendar-aware arithmetic with leap years

Rounding rules

Internal calculations use full floating-point precision. Display values are rounded for readability (typically 2 decimal places for currency, 1 for percentages). Amortization schedules may show penny-level rounding on the final payment.

AI boundary

The AI Calculator extracts structured fields from natural language only. It never computes numeric results. All math runs through the deterministic engine after you confirm inputs.

Data handling

Standard calculator inputs stay in your browser. Share links encode state in URLs; short links store state temporarily (up to 30 days). See privacy policy for details.