Deterministic Financial & Statutory Calculators
Client-side financial estimation and statutory fee calculators with mathematical transparency.
Active Utilities7
Stripe Fee Calculator 2026 — Card Processing & Reverse Invoicing
Calculate exact Stripe processing fees, net payouts, and reverse invoicing amounts (how much to charge to receive $X net) with zero server data transfer.
VAT Calculator 2026 — Add or Extract VAT & Sales Tax
Calculate exact Value Added Tax (VAT) and sales tax additions or reverse deductions instantly. Free, private, client-side VAT calculator with country presets (UK, Germany, France, Turkey, etc.).
PayPal Fee Calculator 2026 — Merchant Fees & Reverse Invoicing
Calculate exact PayPal commercial transaction fees, net payouts, and reverse invoice amounts (how much to charge to receive $X net) with zero server data transfer.
Freelance Hourly & Day Rate Calculator 2026 — Billable Rate Modeling
Calculate your true freelance hourly and day rates based on desired net income, business overhead, non-billable administrative time, and tax reserves. 100% private.
Profit Margin & Markup Calculator 2026 — Gross Margin vs Markup
Calculate gross profit margin, markup percentage, revenue price, and profit multiplier instantly. Master the mathematical difference between margin and markup with zero server tracking.
Mortgage Calculator 2026 — Amortization Schedule & Early Payoff
Calculate your monthly mortgage payments, total interest costs, and full amortization schedule. Simulate extra principal payments and dual annual/monthly interest rates.
Compound Interest Calculator 2026 — Investment Growth & Compounding Schedule
Calculate compound interest on investments, savings, and retirement funds. Simulate monthly contributions, compounding frequencies, and inflation-adjusted real purchasing power.