Deterministic Financial & Business Calculators
Transparent online utilities for freelancers, e-commerce sellers, employees, and founders. Real math, explicit assumptions, and instant reactive answers.
All Verified Calculators
Deterministic, testable financial models with transparent mathematical documentation.
Freelance Net Hourly Rate & Fee Calculator
Calculate your required billing rate after platform fees, taxes, and non-billable hours.
Required Gross = Desired Net ÷ ((1 - Tax%) × (1 - Platform%) × (1 - Processing%))
E-Commerce Profit & Delivery Margin Calculator
Accurately model per-order gross profit, net margin, return-adjusted profit, and break-even ROAS.
Net Contribution = Order Revenue - COGS - Shipping - Packaging - Platform Fee - Ad CPA - Expected Return Loss
Smart Income Tax & Salary Deduction Calculator
Estimate taxable income, statutory deductions, social insurance, and net salary across 4 jurisdictions.
Net Pay = Gross Income - Statutory Tax Brackets - Social Contributions (FICA/NI/CPP/Medicare) - Pre-tax Deductions
SaaS & Subscription Profitability Calculator
Analyze MRR, ARR, margin-adjusted Customer Lifetime Value (LTV), LTV:CAC, and payback period.
Adjusted LTV = (ARPU × Gross Margin%) ÷ Monthly Churn% | Payback = CAC ÷ (ARPU × Gross Margin%)
Multi-Currency Bank Conversion Calculator
Calculate true international transfer costs including exchange rate markups and hidden bank spreads.
Total FX Cost = Fixed Wire Fee + (Send Amount × % Fee) + (Send Amount × FX Markup Spread%)
Engineered for Accuracy, Privacy & Speed
Every calculator is designed for instant answers, transparent formulas, and complete data isolation.
Top-of-Page Access
No scrolling past 2,000 words of filler content. Immediate reactive inputs with linked sliders.
Documented Formulas
Complete mathematical equations, variable mappings, and step-by-step worked examples published openly.
Verified Schedules
Official statutory brackets for US (IRS), UK (HMRC), Canada (CRA), and Australia (ATO).
Client-Side Isolation
All numbers stay in your browser. No telemetry, no backend logging, no selling of salary or margin data.