Basic Calculator
Standard arithmetic
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Your All-in-One Free Calculator
Stop switching between apps. Master Calculator packs 14 powerful calculators into one clean, ad-free interface — from basic arithmetic to EMI, GST, CGPA, and BMI.
Basic + Scientific
Full arithmetic, trig (sin/cos/tan), log, ln, √, powers, and memory.
Percentage Suite
Marks→%, discount amounts, % change and "X% of Y" in one place.
EMI & Loan
Monthly EMI, total repayment and interest paid for any loan.
GST Calculator
Compute 5%, 12%, 18%, 28% GST — inclusive or exclusive mode.
Interest (SI & CI)
Simple & compound interest with flexible compounding periods.
CGPA / GPA
Weighted GPA on 4 or 10-point scales with percentage conversion.
Area & Volume
Circle, square, rectangle, triangle and cylinder calculations.
Unit Converter
Length, weight, temperature, area and speed in 30+ units.
How to Use Master Calculator
Pick a Mode
Click any icon at the top — Basic, EMI, GST, CGPA etc.
Enter Values
Type into the labelled fields. Results update in real-time.
Read Results
See clearly labelled results with breakdowns instantly.
Switch Modes
Jump between any of the 14 calculators instantly.
Frequently Asked Questions
Is this calculator completely free?
Yes — 100% free, no sign-up required, no ads. All calculations run inside your browser.
How is EMI calculated?
Using the standard formula: EMI = P·r·(1+r)ⁿ / ((1+r)ⁿ−1), where r is the monthly rate and n is the number of months.
What GST rates does it support?
All Indian GST slabs: 5%, 12%, 18%, and 28% — in both inclusive and exclusive modes.
Can I calculate CGPA on both 4 and 10 scales?
Yes. Switch between 4-point (US) and 10-point (Indian university) scales along with the approximate percentage.
Does the unit converter handle temperature?
Yes. Convert between °C, °F, and Kelvin with offset-aware formula, not just multipliers.
Is data saved between sessions?
No. Calculations are ephemeral and private — nothing is stored on any server.