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
JSCalc
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
Carbon Footprint Calculator: Home, Car, Flights, Diet
In reality, you don’t need to think about your carbon footprint as an amorphous state of mind, it’s really a collection of very concrete actions: … Read More
Wave Energy Calculator: Ocean Wave Power Per Meter
Wind sweeping over an ocean surface produce waves. These waves produce swells which is carried to the shoreline in a regular way. To harness that … Read More
Sample Size Calculator: Margin of Error & Confidence
So, how do I recruit? You want a specific answer with little means of getting it. How many response will be enough to produce valid … Read More
Hourly to Annual Salary Calculator With Pay Periods
Your offer letter appears impressive. But when you attempt to plug it in to the rent check, it’s all smoke and mirrors. That year-long number … Read More
DC Voltage Drop Calculator for 12V 24V 48V Wiring
Think of it like this: Your camp fridge goes dead. Why? Because voltage dropped as the battery’s voltage sagged under the load. There was still … Read More
Weight Percentile Calculator for Kids and Adults
If you’ve ever been to a pediatrician’s office, you’ve likely glanced at a growth chart hanging on the wall. Those spaghetti-like tangles appears to be … Read More
BMX Gear Ratio Calculator: Gear Inches & Rollout
Using this calculator allows you to see how the choices you make with your equipment impact your ride. I’ve talked to folks who talk about … Read More