Author: PK

PK started DQYDJ in 2009 to research and discuss finance and investing and help answer financial questions. He's expanded DQYDJ to build visualizations, calculators, and interactive tools. PK lives in New Hampshire with his wife, kids, and dog.
Squared Calculator

Use this squared calculator to find the square of any number. Enter a value and instantly see it multiplied by […]

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Percentage of Percentage Calculator

Below is a percentage of percentage calculator, which will calculate the percentage of another percentage. Enter a percentage X% which […]

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Exponent Calculator

On this page is an exponent calculator. Enter a base b and an exponent or power n, and we'll compute […]

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Percent Error Calculator: How Far Off Was The Measurement?

Below is a percent error calculator, which will compute the percent error between a measured value and the actual, known […]

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Percent Change Calculator: What Was the Change from the Start to Finish?

On this page is a percent change calculator. Enter two numbers and we'll calculate the percentage change to go from […]

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Log Base 2 Calculator

On this page is a log base 2 calculator. Enter a number to find the logarithm base 2 and we'll […]

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Cubed Calculator

Use this cubed calculator to find the cube of any number. Enter a value and instantly see it multiplied by […]

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2025 Bitcoin Return

In 2025, bitcoin returned -6.33% in US dollar terms based on a buy-and-hold approach of buying the "opening" trade on […]

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2025 Ethereum Return

Ethereum returned -10.96% in 2025 in US Dollar terms. That's based on an "opening" trade of $3,332.41 on January 1, […]

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Fraction Exponent Calculator

Calculate numbers raised to fractional exponents - perfect for roots and powers in one operation. Fraction exponent calculator How fractional […]

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