Welcome to the Free Online Calculator Use blog page. Subscribing to this blog lets you know whenever a new calculator has been added to the site, or when an existing calculator has been updated or upgraded.

To subscribe to my calculator blog (no email necessary), right-click on the orange RSS button below, and then paste the URL into your RSS reader. Or, click on the *Feedly* or *My Yahoo!* button if you keep a personalized home page at one of those sites.

You can also be alerted to new and updated calculators by following me on either Facebook, Twitter, or Google Plus, or by subscribing to my Monthly **What's New** email update (subscription form in the right-hand column or below all calculators).

###### Feb 22, 2023

### New! Bitcoin Satoshi Calculator

This 290th new calculator is the most important calculator I have ever created.

Why?

Because it forced me to learn:

- What all-important problem Bitcoin was brilliantly designed to solve.
- How Bitcoin works, which once understood, explains why it is the only cryptocurrency that meets all of the requirements of digital money.
- How Bitcoin is giving property rights to some oppressed populations for the first time in their lives.
- The generational wealth current Bitcoin owners could realize if it ever becomes the global reserve currency.

If you take the time to study the resources listed in the **Learn** section of the page, the Bitcoin Satoshi Calculator could be the most important online calculator you have ever visited.

From what I've learned, the question you need to ask yourself is: Will people in the future call you "lucky" because you took the time to learn about Bitcoin now, or will you call others "lucky" because they did take the time and you didn't?

Specifically, the Bitcoin Satoshi Calculator in the *Investing* section, will convert between bitcoin, satoshi, and US dollars.

Plus, since the calculator loads the current Bitcoin price from coingecko.com, you can enter a "what if" future price to see what your current or planned holdings would be worth at that future price.

Here is a screenshot showing an example of inputs and outputs.

If you use my affiliate link (https://www.swanbitcoin.com/danpeterson) to set up an account with Swan Bitcoin, you will get **$10 worth of bitcoin for free**. Otherwise, type "swanbitcoin.com" into your web browser to start your journey to the future of money.

Please use the expandable feedback form beneath the calculator to let me know if you discover any issues or have any suggestions for improvements.

Stack sats and chill!

-Dan

P.S. The new calculator was also added to the Ad-Free Member Version.

###### Feb 07, 2023

### Updated About Me Page

Added the following video/text to my **About Me** page after a 2-month journey to financial enlightenment.

My Story, Part 5: The Biggest Aha! Moment of my Life

**Hint:** Will you choose the blue pill or the orange pill?

###### Jan 11, 2023

### New! Five Number Summary Calculator

This 289th new calculator, the Five Number Summary Calculator in the *Statistics* section, will calculate the five-number summary for an entered data set.

Specifically, the calculator will find the data set's minimum value, first quartile, median, third quartile, maximum value, and interquartile range and generate the step-by-step solution and a visual summary representation.

Note that while there are several methods for calculating quartiles when position values fall between two numbers in the data set, this calculator uses the interpolation method.

Here is a screenshot showing a snippet of the results of the built-in example.

Please use the expandable feedback form beneath the calculator to let me know if you discover any issues or have any suggestions for improvements.

Happy New Year!

-Dan

P.S. The new calculator was also added to the Ad-Free Member Version.

###### Nov 21, 2022

### New! Octal to Decimal Converter

This 288th new calculator, the Octal to Decimal Converter in the *Conversion* section, will convert octal numbers to decimal numbers and show its work.

Here is a screenshot showing an example conversion.

And here is a screenshot showing how the calculator generates a tutorial showing how to use the successive duplication method to convert octals to decimals.

Please use the expandable feedback form beneath the calculator to let me know if you discover any issues or have any suggestions for improvements.

Happy Thanksgiving!

-Dan

P.S. The new calculator was also added to the Ad-Free Member Version.

###### Oct 25, 2022

### New! Add Multiple Feet and Inches Calculator

This 287th new calculator, the Add Multiple Feet and Inches Calculator in the *Construction* section, will add multiple feet and inches measurements, including fractions of an inch, and give the results in decimal and tape measurement formats (rounded to your desired fraction of an inch).

Results also include total inches, a step-by-step tutorial showing how to add the measurements manually, and a printable list of the measurements.

Here is a screenshot showing an example calculation.

And here is a screenshot showing how the calculator generates a tutorial showing how to add the measurements without a calculator.

Thank you!

-Dan

P.S. The new calculator was also added to the Ad-Free Member Version.

###### May 09, 2022

### New! Percentile Rank Calculator

This 286th new calculator, the Percentile Rank Calculator in the new *Statistics* section, will calculate a percentile rank for a value within a data set.

Since there is no standard percentile rank formula, the calculator calculates the rank using three different methods, including the PERCENTRANK.INC *Excel* method.

Finally, the calculated results include the step-by-step solution for each of the included methods.

Here is a screenshot showing the results of one of the built-in examples.

Thank you!

-Dan

P.S. The new calculator was also added to the Ad-Free Member Version.

###### Apr 26, 2022

### New! Percentile Calculator

This 285th new calculator, the Percentile Calculator in the new *Statistics* section, will calculate a percentile value from a data set.

Since there is no standard percentile formula, the calculator calculates the value using two primary methods: the *Nearest Rank Method* and the *Linear Interpolation Between Closest Ranks Method*, including three variants of the latter.

Finally, the calculated results include the step-by-step solution for each method and a chart comparing them.

Here is a screenshot showing the chart included in the results.

Thank you!

-Dan

P.S. The new calculator was also added to the Ad-Free Member Version.

###### Jan 07, 2022

### New! Contract for Deed Calculator

This 284th new calculator, the Contract for Deed Calculator in the *Mortgage* section, will calculate a monthly contract for deed payment, including the interest-only amount, or calculate the balloon from a monthly payment amount.

Sellers can use the calculator to optimize a buyer's contract, and buyers can use it to double-check the seller's calculations.

Finally, the calculator will also generate a printer-friendly amortization schedule.

Here is a screenshot showing an example of the calculated results.

As always, please use the expandable feedback form beneath the calculator to let me know if you discover any issues and/or have any suggestions for improvements.

Happy New Year!

-Dan

P.S. The new calculator was also added to the Ad-Free Member Version.

###### Nov 18, 2021

### New! 30 60 90 Triangle Calculator

**Yes, I'm Still Alive!**

If you've been following this page, you have no doubt noticed it's been a while since I've posted any updates. In case you're interested, here's the story in a nutshell.

Wanting to downsize from our large home now that our eight children are grown and out on their own, we spent April and most of May readying our house for showings before putting it up for sale at the end of May. We marked the price up significantly from the realtor's comparable market analysis (CMA) to give us time to find a smaller home to purchase. Or so we thought. To our shock, our home received a full-price offer in 36-hours!

On such short notice, the only smaller home we could find in our desired area was an offer from friends to sell us a house they had been renting out. Unbeknownst to them, the renters had trashed the place to the point it was barely habitable. Only after we purchased the home did we discover that all of our local contractors were booked for the year. Consequently, I was forced to spend the last six months gutting and remodelling our new home.

I still have three rooms to go, but the main living areas are completed, which has freed up the time I needed to start getting back to the work I love. Whew!!

With that said, I am finally ready to announce a new calculator. This 283rd new calculator, the 30 60 90 Triangle Calculator in the *Math* section, will solve a special right triangle having interior angles of 30, 60, and 90 degrees given just one of the measurements.

Plus, the calculator will find the triangle's inradius and circumradius and show step-by-step how the other measurements are derived from the one provided.

Here is a screenshot showing an example of the calculated results.

As always, please use the expandable feedback form beneath the calculator to let me know if you discover any issues and/or have any suggestions for improvements.

Happy Thanksgiving!

-Dan

P.S. The new calculator was also added to the Ad-Free Member Version.

###### Mar 15, 2021

### New! Baluster Calculator

This 282nd new calculator, the Baluster Calculator in the *Construction* section, will calculate even post spacing, the number of balusters needed, and the spacing of those balusters.

Plus, a printable diagram is generated that includes the near-side, on-center, and far-side measurements for posts and balusters (metric, inches only, or feet and inches, depending on your preference).

Here is a screenshot showing an example of the generated posts diagram with *Inches only* measurements selected.

Here is a screenshot showing an example of the generated baluster diagram with *Inches only* measurements selected.

As always, please use the expandable feedback form beneath the calculator to let me know if you discover any issues and/or have any suggestions for improvements.

Thank you!

-Dan

P.S. The new calculator was also added to the Ad-Free Member Version.

###### Mar 03, 2021

### New! Even Spacing Calculator

This 281st new calculator, the Equal Spacing Calculator in the *Construction* section, will generate a list of spacing options for two to a maximum number of dividers (balusters, spindles, shelves, slats, pickets, fasteners, etc.).

Plus, when a spacing option is selected, a printable diagram is generated that includes the near-side, on-center, and far-side measurements for each divider (metric, inches only, or feet and inches, depending on your preference).

Here is a screenshot showing an example of the generated diagram with *Inches only* measurements selected.

Thank you!

-Dan

P.S. The new calculator was also added to the Ad-Free Member Version.

###### Feb 18, 2021

### New! Carpenter Fraction Calculator

This 280th new calculator, the Carpenter Fraction Calculator in the *Construction* section, will add, subtract, multiply, divide, and scale feet and inches.

In addition to giving the results in both decimal and tape measurement formats (rounded to your desired fraction of an inch), the results include the step-by-step solution.

Plus, if you're a model builder, and you want to scale up or down from kit dimensions, you can choose to multiply a tape measurement by a percentage (50% = half size, 200% = double size, etc.).

You can also use the scale option to convert inches to feet and inches (enter the inches and set the scale factor to 100%).

Thank you!

-Dan

P.S. The new calculator was also added to the Ad-Free Member Version.

###### Feb 07, 2021

### New! Rounding Calculator

This 279th new calculator, the Rounding Calculator in the *Math* section, will round a number to any one of 18 different place values.

In addition to rounding to the desired place, the results include the number's color-coded decimal place value chart and steps to complete the rounding, as illustrated in the image below.

Plus, the results also include a chart showing the entered number rounded to the other 17 optional places (billions to billionths).

Hope you enjoy the Super Bowl!

-Dan

P.S. The new calculator was also added to the Ad-Free Member Version.

###### Feb 07, 2021

### New! Convert Percent to Decimal Calculator

This 278th new calculator, the Percent to Decimal Calculator in the *Conversion* section, will convert percentages to decimal numbers.

Plus, the calculator will show its work and give a step-by-step summary of the three methods you can use to arrive at the answer, as illustrated in the image below:

Many thanks,

-Dan

P.S. The new calculator was also added to the Ad-Free Member Version.

###### Feb 01, 2021

### Update: Paycheck Calculator Updated to 2021 Tax Rates

Just a quick note to let you know that I have updated the Paycheck Calculator to reflect the 2021 federal withholding rates, as well as the latest state withholding rates (2020).

Thank you!

-Dan

P.S. The updates were also added to the Ad-Free Member Version of the calculator.

###### Jan 13, 2021

### New! Convert Decimal to Percent Calculator

This 277th new calculator, the Decimal to Percent Calculator in the *Conversion* section, will convert decimal numbers to percentages.

Plus, the calculator will show its work and give a step-by-step summary of the three methods you can use to arrive at the answer, as illustrated in the image below:

Many thanks,

-Dan

P.S. The new calculator was also added to the Ad-Free Member Version.

###### Jan 01, 2021

### New! Ordering Decimals Calculator

This 276th new calculator, the Ordering Decimals Calculator in the *Math* section, will sort a set of decimal numbers from least to greatest and from greatest to least.

In addition to arranging the decimals in ascending and descending order, the results include the step by step process for sorting the decimals manually. For example, the image below illustrates *Step #3* for sorting the following set from least to greatest:

**0.15, 2.63, 0.008, 5, 4.27, 1.83, 3.13, 3.05, 4.0192**

Happy New Year!

-Dan

P.S. The new calculator was also added to the Ad-Free Member Version.

###### Dec 14, 2020

### New! Multiplying and Dividing Decimals Calculator

Even though had I created a Long Multiplication Calculator and a Long Division Calculator years ago, both of which handle decimal numbers, my most often requested calculator has been a *Multiplying Decimals Calculator*.

For that reason, I finally decided to accommodate that request by creating a basic Multiplying and Dividing Decimals Calculator (#275) that links to the long versions for those that want to see the step-by-step solutions.

In addition to providing the result of decimal multiplications and divisions, results containing decimals also include a *Rounding Chart* showing the result when rounded to each lesser number of places.

Thank you!

-Dan

P.S. The new calculator was also added to the Ad-Free Member Version.

###### Dec 10, 2020

### 4 New Converters!

To complete the subject of infix, postfix, and prefix conversions, I have added the following four converters to the *Conversion* section:

**#271:** Postfix to Prefix Converter

**#272:** Prefix to Postfix Converter

**#273:** Postfix to Infix Converter

**#274:** Prefix to Infix Converter

The results of all four of the new converters include a step-by-step tutorial showing how to complete each conversion using the stack method.

As always, please use the expandable feedback form beneath the calculators to let me know if you discover any issues and/or have any suggestions for improvements.

Thank you!

-Dan

P.S. The new calculators were also added to the Ad-Free Member Version.

###### Dec 01, 2020

### New! Prefix (Polish Notation) Evaluator

This 270th new calculator, the Prefix Evaluator in the *Math* section, will evaluate a prefix expression (Polish Notation).

Plus, included in the results will be the step-by-step process for achieving the result using the stack method.

Here is a screen shot showing a partial example of how the evaluator shows the color-coded steps of the evaluation:

Thank you!

-Dan

P.S. The new calculator was also added to the Ad-Free Member Version.

###### Dec 01, 2020

### New! Infix to Prefix Converter

This 269th new calculator, the Infix to Prefix Converter in the *Conversion* section, will convert infix math notation into prefix notation (Polish Notation, or PN) using the stack method.

You can either enter your own infix expression or choose from 22 built-in example infix expressions.

Plus, in addition to converting infix to prefix, the converter will display the step-by-step process used to arrive at the conversion.

Here is a screen shot showing an example of how the calculator displays an interactive explanation of the conversion using the stack method:

Thank you!

-Dan

P.S. The new calculator was also added to the Ad-Free Member Version.

###### Nov 04, 2020

### New! Endpoint Calculator

This 268th new calculator, the Endpoint Calculator in the *Math Calculators* section, will find a missing endpoint given the midpoint and the other endpoint.

Plus, the calculator shows the step-by-step solution and draws the results on a Cartesian plane.

Here is an example of how the Endpoint Calculator shows its work when given a starting endpoint of (-1, 4) and a midpoint of (1, 5):

Thank you!

-Dan

P.S. The new calculator was also added to the Ad-Free Member Version.

###### Oct 30, 2020

### New! Midpoint Calculator

This 267th new calculator, the Midpoint Calculator in the *Math Calculators* section, will find a line segment's midpoint given the two endpoints.

Plus, the calculator also calculates the line's length, shows the step-by-step solution, and draws the results on a Cartesian plane.

Here is an example of how the Midpoint Calculator shows its work:

Thank you!

-Dan

###### Oct 09, 2020

### New! Ohms Volts Watts Amps Converter

This 266th new calculator, the Ohms Volts Watts Amps Converter in the *Conversion Calculators* section, will calculate any two of the four electrical values from the two entered.

Plus, each calculated result includes the Ohms Law formulas used, along with the step-by-step solution of the two equations.

So instead of needing to find and refer to an *Ohms Law Formula Wheel* for the appropriate formula, the converter makes the selections based on the two values you enter, and then solves the formulas -- all in the blink of an eye!

In case you're not familiar with it, here is the Ohms Law Pie Chart the *Ohms Volts Watts Amps Converter* is based on:

Thank you!

-Dan

P.S. The new calculator was also added to the Ad-Free Member Version.

###### Sep 03, 2020

### New! Price Per Square Foot Calculator

This 265th new calculator, the Price Per Square Foot Calculator in the *Personal Finance* section, will calculate the rent or price per square foot.

If you already know the rent or price per square foot, you can also use the calculator to calculate the price or rental payment from the per square foot value.

Plus, the calculator includes a built-in square footage calculator wherein you can calculate and total the square footage of any number of rooms, floors, and buildings. And you can enter width and length measurements in feet only, feet and inches, or inches only.

Here is a screen shot showing a how the built-in, expandible square footage calculator converts the width and length measurements to square feet and totals all square footages:

And finally, you can save or print your square footage entries for later use.

Thank you!

-Dan

P.S. The new calculator was also added to the Ad-Free Member Version.

###### Aug 18, 2020

### New! Rule of 72 Calculator

This 264th new calculator, the Rule of 72 Calculator in the *Investing* section, will calculate the time or interest rate required for an investment to double.

In addition to the Rule of 72, the calculator also includes alternative double-your-money rules (69 and 70), as well as the Rule of 115 (triple your money) and the Rule of 144 (quadruple your money).

Plus, if you enter the starting amount of the investment, an annual growth chart will be included in the results.

Here is a screen shot showing a portion of the results when *Rule of 72* and *Number of Years* are selected:

Thank you!

-Dan

P.S. The new calculator was also added to the Ad-Free Member Version.

###### Jul 25, 2020

### New! Yahtzee Online Game

This 263rd new calculator, the Yahtzee Online Game in the *Sports, Games, and Fun* section, includes options for calculating a scoresheet, playing solitaire, or playing multiplayer with up to six players.

A built-in score calculator displays the points for all unfilled combinations after each dice roll, and you can click the blue combination titles for popup scoring descriptions.

Here is a screen shot showing an example of the game report you can print out when playing solitaire Yahtzee:

It only takes about 4 minutes to play a game of solitaire Yahtzee, so I invite you to give it try and and let me know if you discover any issues and/or have any suggestions for improvements.

Thank you!

-Dan

P.S. The new calculator was also added to the Ad-Free Member Version.

###### Jun 25, 2020

### New! Dice Roll Simulator

This 262nd new calculator, the Dice Roll Simulator in the *Sports, Games, and Fun* section, will generate a random dice roll for 1-20 dice having 2-20 sides.

A built-in roll calculator will calculate the sum, average, and product of each roll, plus keep cumulative totals for a series of rolls.

Also, the shake timing can be set to random stop time or to manual stop time, and the roll-display can be set to include a history of prior rolls.

Here is a screen shot showing an example of how the virtual dice roller displays the rolls when five, six-sided dice are being rolled:

Thank you!

-Dan

P.S. The new calculator was also added to the Ad-Free Member Version.

###### Jun 10, 2020

### New! Speed Distance Time Calculator

This 261st new calculator, the Speed Distance Time Calculator in the *Conversion* section, will calculate the speed, distance, or time when given the two known variables.

In other words, the calculator will solve for *speed* given the time and distance, *distance* given the speed and time, and *time* given the speed and distance.

Also, speed and distance units can be entered or solved for in inches, feet, yards, miles, nautical miles, centimeters, meters, and kilometers, and rate can be entered or solved for in per second, per minute, or per hour ratios.

Plus, the results will include a step-by-step explanation detailing how the calculator solved for the missing variable -- including any unit conversions it performed.

Here is a screen shot showing an example of how the calculator explains its work:

Thank you!

-Dan

P.S. The new calculator was also added to the Ad-Free Member Version.

###### Mar 14, 2020

### Update: Budgeting Percentages Average Calculator

Just a quick note to you let you know that I have updated the Budgeting Percentages Average Calculator in the *Budget* section to reflect the latest *Consumer Expenditure Survey* conducted by the U.S. Bureau of Labor Statics.

Just enter your before-tax income and the calculator will tell you what others in your income level spend on 14 different household expense categories, plus 83 sub-categories.

Here is a screen shot showing a partial example of how your income is split up between expense categories and sub-categories based on the survey results:

Plus, I also added a 50/30/20 Budget Calculator to the *Notes* section on the page.

Thank you!

-Dan

P.S. The updates were also added to the Ad-Free Member Version of the calculator.

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