Percentage Calculator

The SolversPro Percentage Calculator is a free browser-based math utility that calculates percentage of a number, proportional shares, and percentage increase or decrease across three interactive calculation modes in real time.

Result (Z)

20% of 150 = 30

Percentage (Z%)

20%

30 is 20% of 150

Percentage Change

+50%

Increase

Absolute Difference

+25

75 - 50 = 25

From 50 to 75 is a 50% increase

How to Use

Pick Mode

Select one of the 3 tabs matching your problem.

Enter Values

Fill in your numbers with any decimals needed.

See Result

Calculations execute instantly as you type.

Copy & Save

Copy the answer with one click or save it.

Common Use Cases

🏷️

Shopping Discounts

Instantly calculate how much you save on 15%, 25%, or 40% store sales.

🧾

Sales Tax & VAT

Figure out the exact tax owed on invoices or consumer goods before checkout.

🎓

Grade Tracking

Convert test points into exact grade percentages to monitor academic progress.

💼

Salary Raise Negotiations

Calculate the percentage boost or exact dollar increase for your next salary adjustment.

Percentage Calculation Methods & Formula Reference

Standard mathematical formulas and definitions for computing percentage proportions, discounts, and variations.

Calculation Mode	Mathematical Formula	Example Query	Calculated Result
Percentage of a Value	Result = (P / 100) × V	What is 20% of 150?	30
Fraction as Percent	Percent = (X / Y) × 100	What percent is 25 of 200?	12.5%
Percentage Increase	Change = ((V₂ - V₁) / V₁) × 100	Increase from 50 to 75	+50.0%
Percentage Decrease	Change = ((V₂ - V₁) / V₁) × 100	Decrease from 80 to 60	-25.0%

Frequently Asked Questions

/How do I calculate a 20% discount on a price?

To calculate a 20% discount, use Mode 1 ('What is X% of Y?'). Enter 20 as the percentage and the original price as the number. The result is your total savings. To find your final discounted price, simply subtract that discount amount from the original price (or directly calculate 80% of the original price).

/What is the formula for percentage increase or decrease?

The formula for percentage change is: ((New Value - Original Value) / |Original Value|) × 100. If the resulting number is positive, it indicates a percentage increase. If negative, it represents a percentage decrease. Mode 3 computes both the exact percentage change and the absolute difference automatically.

/Can I use this calculator for VAT, GST, or sales tax?

Yes! To find sales tax, VAT, or GST, use Mode 1 ('What is X% of Y?'). Enter your local tax rate (e.g., 7% or 20%) and the pre-tax subtotal. The calculated result is your tax amount. Add this figure to your subtotal to get the final bill including tax.