Rental Property Depreciation Calculator (27.5-Year MACRS)
The numbers worked. Rent = Mortgage. There is leftover cash flow. Equity grows over time in the market. That’s the spiel. But what most novice … Read More
JSCalc
Markup Percentage Calculator: Cost to Price & Margin
Knowing exactly what number sits between your cost and your price allow you to quote a customer with confidence. It’s the difference that will keep … Read More
Natural Logarithm Calculator: ln(x), e^x, Log Base b
You must understand that natural logarithm is behind exponential growth and exponential decay, which is the mechanism behind everything from radioactivity to our perception of … Read More
Break Even Point Calculator: Units & Revenue Needed
When it comes to launching a product, you have energy but no idea if you’re actualy making money. Why? Because when you’re excited, the math … Read More
LED Resistor Calculator: Ohm, Watt & Series/Parallel
With a 9-volt battery and a new red LED, you hook things up hoping for a nice constant light to put on your night stand. … Read More
Binomial Distribution Probability Calculator + PMF Table
The binomial distribution apply to binary decisions, in other words, any decision with exactly two options. That’s true of quality control checks, election polls, and … Read More
Resistor Color Code Calculator – 4, 5, 6 Band Decoder
When you’re working in your garage and pull out a beige resistor from your project box only to discover its label has worn away, there’s … Read More
Correlation Coefficient Calculator (Pearson r + r²)
Suppose you’re looking at two lists of numbers. The first list represent hours studied for an exam; the second list contains your final grade on … Read More
Fraction Exponent Calculator: Rational Powers & Roots
On paper, rational exponents can be intimidating. They seem like a math teacher’s evil plot to make their students miserable so they’d just go home … Read More
Labor Probability Calculator by Gestational Week
Week Thirty-Nine: “Now it’s not just the calendar that worries us. Now we’re worried about the internet, which tells us that labor will happen any … Read More