Daily Math & Conversions·Zero-Upload Browser Execution
Percentage, Margin & VAT Calculator
Compute VAT/sales tax (inclusive or exclusive), percentage deltas, retail discounts, and net profit margins.
Net Amount
$1,250
Tax Amount
$250
Final Total
$1,500
More in Daily Math & Conversions
10-Dimension Unit Converter
Instant precision conversions across Length, Mass, Temperature, Digital Storage, Speed, Pressure, Energy, Area, Volume, and Time.
Compound Growth Visualizer
Project multi-year savings and compound interest with monthly contributions and an interactive Recharts breakdown.
Color Palette & WCAG Contrast Inspector
Convert HEX colors to OKLCH, RGB, and HSL, preview harmonious tints, and verify WCAG 2.1 AA/AAA accessibility ratios.
Date Difference & Unix Epoch Lab
Convert Unix timestamps (seconds or milliseconds) to ISO-8601 UTC/local dates and calculate exact calendar spans.
IPv4 CIDR & Subnet Calculator
Compute network address, broadcast address, subnet mask, usable host range, and total host capacity from CIDR notation.
Scientific Expression Evaluator
Safely evaluate algebraic and trigonometric formulas (`sin`, `cos`, `tan`, `sqrt`, `log`, `abs`, `pi`, `e`) locally.