Percentage Calculator

Calculate percentages, percentage change, markups/discounts, reverse percentages, and batch calculations.

Basic %: compute (A% of B), or what % A is of B.
Basic % Results
A% of B
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What % is A of B
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% Change: compare old vs new to get change, increase, or decrease.
% Change Results
Absolute Change
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% Change
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Direction
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Add/Subtract %: apply markup or discount to a value.
Add/Subtract % Results
Percent Amount
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Result Value
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Expression
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Reverse %: find original value before a discount/markup.
Reverse % Results
Original Value
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Check
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Points vs %: compare percentage points and relative percent change.
Points vs % Results
Percentage Points
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Relative % Change
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Direction
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Ratio → %: convert a ratio (A : B) into a percentage share.
Ratio → % Results
Percentage
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Expression
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Batch: paste multiple lines and compute in one go. Use one of the supported formats below.
Separate values with commas or spaces. One calculation per line.
Batch Results
# Input Result Notes
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Percentage Calculator – Overview

The Nautical Solver Percentage Calculator is a multi-purpose utility designed to handle a wide range of percentage-based calculations. It covers basic percentage operations as well as more advanced use cases such as percentage change, markups and discounts, reverse percentage calculations, and batch processing.

The calculator is structured into multiple tabs, each focusing on a specific type of percentage operation. All calculations are deterministic and based on standard mathematical definitions.

Available Calculation Modes
  • Calculate a percentage of a given value
  • Determine what percentage one value is of another
  • Compute percentage increase or decrease between two values
  • Add or subtract a percentage (markup or discount)
  • Reverse percentage calculations to find original values
  • Compare percentage points versus relative percentage change
  • Convert ratios into percentage form
  • Perform batch percentage calculations using multiple input lines
Typical Use Cases

This calculator can be used for financial analysis, engineering calculations, reporting, planning, budgeting, performance comparison, and general numerical evaluation where percentage relationships are required.

Notes & Limitations
  • All calculations follow standard percentage formulas
  • Division by zero and invalid inputs are automatically rejected
  • No rounding assumptions are enforced beyond displayed precision
  • Batch calculations require one operation per line in the supported format
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