Percentage Calculator

To calculate X percent of Y, multiply Y by X and divide by 100. Formula: (X × Y) / 100. For example, 20% of 200 = (20 × 200) / 100 = 40. Or just use our calculator above —type in the numbers and get instant results.

Percentage increase = ((New Value - Old Value) / Old Value) × 100. For example, going from 100 to 150: ((150 - 100) / 100) × 100 = 50% increase. Use the "Increase/Decrease" tab above for instant results.

To find what percentage X is of Y, divide X by Y and multiply by 100. Formula: (X / Y) × 100. For example, 25 out of 100 = (25 / 100) × 100 = 25%. Select the "X is what % of Y" mode in the calculator above.

To calculate the discount amount: Original Price × Discount % / 100. To calculate the final price: Original Price × (1 - Discount % / 100). For example, 20% off $50 = $50 × 0.8 = $40, with a $10 discount.

The fastest way to calculate percentages depends on the problem. To find X% of Y, multiply Y by X and divide by 100. For example, 20% of 80 = 80 * 20 / 100 = 16. You can also convert the percentage to a decimal first (20% = 0.2) and multiply directly.

The compound interest formula is A = P(1 + r/n)^(nt), where A is the final amount, P is the principal, r is the annual interest rate, n is the number of times interest is compounded per year, and t is the time in years. With regular monthly contributions, the formula becomes more complex, which is why a calculator is so useful.

The standard tip in the United States is 15-20% of the pre-tax bill. 15% is considered average service, 18% for good service, and 20% or more for excellent service. For bartenders, -2 per drink or 15-20% of the total is standard. Always tip on the pre-tax amount.

A good mortgage rate depends on the market and your credit score. Historically, rates below 5% are considered excellent. Factors include credit score, loan term, down payment, loan type, and economic conditions. Always shop around with multiple lenders.

When you make monthly contributions, each contribution starts earning interest from the day it is added. Over long periods, this creates a snowball effect where both your principal and accumulated interest earn more interest. The earlier and more consistently you contribute, the more dramatic the growth.

To calculate weighted grade, multiply each category score by its weight (as a decimal), then add them together. For example: if homework is 30% and you scored 90, and exams are 70% and you scored 85, your grade = (90 * 0.30) + (85 * 0.70) = 86.5%.

The 50/30/20 budget rule: 50% of after-tax income to needs (rent, food, utilities), 30% to wants (dining, travel), 20% to savings and debt. It is a simple framework that can be adjusted based on your individual situation and goals.

Save on interest by making larger down payments, paying off high-interest debt first (avalanche method), refinancing when rates drop, making biweekly payments, and maintaining good credit to qualify for lower rates. Even small extra payments can save thousands over time.

The fastest way to calculate percentages depends on the problem. To find X% of Y, multiply Y by X and divide by 100. For example, 20% of 80 = 80 * 20 / 100 = 16. You can also convert the percentage to a decimal first (20% = 0.2) and multiply directly.

The compound interest formula is A = P(1 + r/n)^(nt), where A is the final amount, P is the principal, r is the annual interest rate, n is the number of times interest is compounded per year, and t is the time in years. With regular monthly contributions, the formula becomes more complex, which is why a calculator is so useful.

The standard tip in the United States is 15-20% of the pre-tax bill. 15% is considered average service, 18% for good service, and 20% or more for excellent service. For bartenders, -2 per drink or 15-20% of the total is standard. Always tip on the pre-tax amount.

A good mortgage rate depends on the market and your credit score. Historically, rates below 5% are considered excellent. Factors include credit score, loan term, down payment, loan type, and economic conditions. Always shop around with multiple lenders.

When you make monthly contributions, each contribution starts earning interest from the day it is added. Over long periods, this creates a snowball effect where both your principal and accumulated interest earn more interest. The earlier and more consistently you contribute, the more dramatic the growth.

To calculate weighted grade, multiply each category score by its weight (as a decimal), then add them together. For example: if homework is 30% and you scored 90, and exams are 70% and you scored 85, your grade = (90 * 0.30) + (85 * 0.70) = 86.5%.

The 50/30/20 budget rule: 50% of after-tax income to needs (rent, food, utilities), 30% to wants (dining, travel), 20% to savings and debt. It is a simple framework that can be adjusted based on your individual situation and goals.

Save on interest by making larger down payments, paying off high-interest debt first (avalanche method), refinancing when rates drop, making biweekly payments, and maintaining good credit to qualify for lower rates. Even small extra payments can save thousands over time.