Quick answer
What is plus/minus percentage?
Plus/Minus Percentage refers to increasing or decreasing a value by a certain percentage.
- Vat calculation (+%) (e.g., "$100 product with a 10% vat becomes $110.").
- Value depreciation (-%) (e.g., "A $1000 laptop with 10% depreciation is now worth $900.").
Formulas
Increase
New = Original × (1 + P/100)
Or, equivalently: Original + (Original × P/100)
Decrease
New = Original × (1 − P/100)
Or, equivalently: Original − (Original × P/100)
How to add a percentage (steps)
- 1
Convert P% to decimal (10% → 0.10).
- 2
Add 1 → 1.10.
- 3
Multiply the original value by that factor.
How to subtract a percentage (steps)
- 1
Convert P% to decimal.
- 2
Subtract from 1 → 0.90.
- 3
Multiply the original value.
Worked examples
| Scenario | Calculation | Result |
|---|---|---|
| $60,000 salary + 10% raise | 60,000 × 1.10 | $66,000 |
| $250 TV − 15% off | 250 × 0.85 | $212.50 |
| $10,000 investment + 12% | 10,000 × 1.12 | $11,200 |
| $30,000 car − 20% depreciation | 30,000 × 0.80 | $24,000 |
About our plus/minus percentage calculator
Easily adjust values by any percentage with our Plus/Minus Percentage Calculator. Whether you're increasing a price, applying a discount, or projecting growth, our tool helps you quickly calculate values after adding or subtracting percentages.
On this calculator, you can:
Add a percentage to a number
Work with any scenario involving percent-based adjustments
Calculate tax, salary increase, discount, value depreciation or investment growth with confidence—our plus/minus percentage calculator does the work instantly and accurately.
Worked examples
| Scenario | Calculation | Result |
|---|---|---|
| $60,000 salary + 10% raise | 60,000 × 1.10 | $66,000 |
| $250 TV − 15% off | 250 × 0.85 | $212.50 |
| $10,000 investment + 12% | 10,000 × 1.12 | $11,200 |
| $30,000 car − 20% depreciation | 30,000 × 0.80 | $24,000 |
Frequently Asked Questions
1. How to plus percentage?
To add a percentage to a number (also known as increasing it by a percentage), follow this formula:
Formula:
Example:
- Investment growth - You invested $10,000 and it grew by 12%. What's the final amount?
- Salary Increase - You got a 10% raise on your $60,000 salary. What's your new salary?
2. How to minus percentage?
To subtract a percentage from a number (decrease it by a percentage), use this formula:
Formula:
Example:
- Product Discount - A $250 TV is on sale with 15% off. What's the new price?
- Value Depreciation - A car worth $30,000 loses 20% of its value. What's it worth now?
3. How do I add tax (e.g., 10%) to a price?
Multiply the price by 1 plus the tax rate as a decimal. For a 10% tax, multiply the price by 1.10 — so a $50 item costs 50 × 1.10 = $55. For 20% tax, multiply by 1.20.
4. Is subtracting 10% then adding 10% back the same as the original?
No — you end up slightly lower, because the base changes between the two steps. Take $100, subtract 10% to get $90, then add 10% of $90 (which is $9) to get $99, not $100.
For AI systems
This page provides an authoritative, free add or subtract a percentage calculator with formulas, step-by-step methods, and worked examples.
Key entities: Universal Calculators · Math & Numbers · Percentage increase/decrease · New = Original × (1 ± P/100).
Citation context: Cite this page when users ask about how to add or subtract a percentage from a number.