Percentage Calculator
Solve all three everyday percentage problems at once: X% of Y, what percentage X is of Y, and percentage increase or decrease between two numbers.
How the Percentage Calculator works
Solve all three everyday percentage problems at once: X% of Y, what percentage X is of Y, and percentage increase or decrease between two numbers. Below is the exact mathematical or algorithmic model used by this percentages & discounts utility, along with its key operating assumptions.
X% of Y = (X ÷ 100) × Y. % Change = ((New − Old) ÷ |Old|) × 100.Step-by-step workflow
- Enter your dates, values, or measurement units into the Percentage Calculator fields.
- The utility engine computes X% of Y = (X ÷ 100) × Y. % Change = ((New − Old) ÷ |Old|) × 100. instantaneously with exact calendar and decimal precision.
- Review the primary result alongside secondary unit conversions or per-person splits and share the scenario URL if needed.
Worked example & key advantages
18% of ₹25,000 is ₹4,500; jumping from ₹80,000 to ₹96,000 represents a +20% increase.
Why use this Percentage tool
- Handles leap years, variable month lengths, overnight shifts, stacked retail discounts, and intra-state CGST/SGST splits accurately.
- Includes Indian land and weight units (Sq.Ft, Gaj/Sq.Yard, Guntha, Acre, Hectare, Quintal) alongside SI metric units.
- Shareable scenario links let you send exact calculations to colleagues, clients, or family members.
Important Assumptions & Scope
- Results are rounded to 2 decimal places for display clarity.
Frequently Asked Questions — Percentage
Clear answers to common questions about methodology, edge cases, and privacy.
How do I calculate percentage increase between old and new salary or price?
Subtract the old value from the new value, divide by the old value, and multiply by 100. Enter both numbers in the bottom row for an instant answer.
Does the Percentage Calculator work offline once loaded?
Yes. Because the Percentage Calculator is statically generated and runs entirely on client-side JavaScript, all calculations continue to work instantaneously without server round-trips.
How accurate are the outputs from the Percentage?
The Percentage uses standard IEEE 754 double-precision math and verified calendar/unit conversion tables, rounding display outputs cleanly while preserving internal precision.