Original Before Increase Calculator - Find Original Amount Before Percentage Increase
Help
Calculate the original value before a percentage increase, given the new value and percentage increase.
How to Use
- Enter the percentage increase into the first input field.
- Enter the new value (after increase) into the second input field.
- Optionally, check the "Round" box to round the result to two decimal places.
- The calculated original value is shown instantly as you type.
- Click "Add to Memos" or press Enter to save your calculation.
How It Works
The Original Before Increase calculator uses this formula:
For example, to find the original value when the new value is $1,150 after a 15% increase, the calculator computes:
So the original value was $1,000.
Important Note
When the increase percentage is -100%, the calculation is undefined because you cannot divide by zero. The calculator will show an error message in this case.
Practical Examples
- Reverse Salary Calculation: If a new salary is $54,000 after an 8% increase, the original salary was $50,000.
- Original Price Analysis: If an item costs $126 after a 5% price increase, the original price was $120.
- Investment Principal: If an investment is worth $2,240 after 12% growth, the original investment was $2,000.
- Pre-Growth Population: If a city has 103,000 people after 3% growth, the original population was 100,000.
- Original Rent: If rent is now $1,284 after a 7% increase, the original rent was $1,200.
- Base Budget: If a budget is $6,250 after a 25% increase, the original budget was $5,000.
Need more percentage tools?
- Increased Value Calculator
Calculate value after percentage increase. - Original Before Decrease Calculator
Find original amount before percentage decrease. - Decreased Value Calculator
Calculate value after percentage decrease. - Basic Percentage Calculator
For discounts or taxes. - Percentage Change Calculator
Work out increases or decreases. - Original Value Calculator
Reverse a percentage to the original amount. - Part-to-Whole Percentage
Find what % one number is of another. - Tip & Split Calculator
Calculate tip, total & per‑person share. - Specialized Calculators (63+)
Practical everyday calculations for real-life scenarios.
Requirements and Important Information
- No installation required – works directly in your browser.
- Compatible with all modern browsers (Chrome, Firefox, Safari, Edge).
- Calculations are performed locally – no data is sent to any server.
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Your calculation memos is stored only on your device.
Each calculator stores up to 20 most recent calculations, automatically removing the oldest entries when this limit is reached. - Works offline after the initial page load.
- Supports both desktop and mobile devices.
- No account or login required.
Helpful Calculator Features
- Real-time calculations that update as you type.
- Copy results to clipboard with a single click.
- Calculation memos that persists between sessions.
- Option to round results for cleaner numbers.
- Clear visual formulas to understand the math.
- Mobile-friendly interface that works on all devices.
- Dark mode support for comfortable viewing.
- Keyboard shortcuts for faster calculations.
Tips for Accurate Calculations
- Double-check input numbers for accuracy.
- Use decimal points for precision.
- Calculations update instantly as you type.
- When the Round checkbox is checked, numbers are rounded to 2 decimal places.