A collection of precision niche calculators and utilities running 100% in your browser. No sign-ups, no trackers, instant calculations.
Convert annual salary to hourly, daily, weekly, and monthly pay with an instant itemized US after-tax take-home breakdown by state.
Official 2025-2026 progressive District of Columbia income tax estimator with Form D-4A Maryland/Virginia commuter reciprocity exemptions.
Modern AqAdvisor alternative calculating freshwater biological waste percentage, GPH filtration flow turnover, and species compatibility.
Determine invoice due dates, 2/10 Net 30 early payment discounts, annualized APR returns, weekend business day shifts, and late penalties.
Precision scale length and fret slot cut distance schedule based on 12th root of 2 equal temperament with interactive SVG fretboard and CSV export.