Dual Commercial & Engineering Engine
Scientific & Citizen Retail Calculator
Toggle instantly between Citizen retail calculator with GST Tax & Grand Total keys and Casio FX-991EX scientific calculator with trigonometry and powers.
Standard Calculator
Commercial arithmetic with GST (+Tax / -Tax), Grand Total (GT), and currency words
GST: 18%
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Why Professionals & Students Choose This Suite
Zero server latency, 100% private in-browser computation, and verified financial & mathematical formulas.
1-Click Dual Mode Switch
Seamlessly transition between Citizen shopkeeper mode and fx-991EX scientific mode.
High Precision Math Parser
Evaluates complex nested algebraic and trigonometric expressions safely.
AEO & Search Answers
Calculator Modes & Functions FAQs
Everything about retail invoicing math, DEG/RAD angles, and scientific formulas.
Citizen Mode offers dedicated GST TAX+ and TAX- computation buttons, Grand Total (GT) memory accumulation, CE (Clear Entry), Double-Zero (00) fast entry, and automatic numbers-to-words invoicing readout.
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