Fetal Weight Percentile Calculator by Gestational Age
All you hear are the sounds of the Doppler probe and monitor humming as the ultrasound tech takes measurements across your belly and baby’s head. … Read More
JSCalc
CC to Horsepower Calculator: Estimate Engine HP by Type
That’s what you see on the sticker and think you’re good to go. For decades, we’ve thought in terms of cars. Displacement is our unit … Read More
Permutation and Combination Calculator (nPr, nCr)
The more options there are for messing something up, even a seemingly simple one, the more panicky it gets. You’re standing in line at the … Read More
Sample Size Power Calculator for Effect Size & Power
Your goal is to plan a study and wonder about its validity. It is not merely about collecting data, but about whether you’ll have enough … Read More
Torque Wrench Extension Calculator (Crowfoot Setting)
I’ve always tightened a lug nut with a wrench, and when it clicks I think I’m at the right spec, but using an adapter can … Read More
Area Converter: sq m, sq ft, Acre, Hectare, sq mile
It’s one of those concepts that’s difficult to wrap your head around: area is not linear but exponential. Double the size of a square and … Read More
Impact Force Calculator: Fall & Collision Force (N, g)
Drop your smart phone, which lands on tile. You feel your stomach drop before you even look. Your stomach drops as you hear a crack. … Read More
Length Converter: mm, cm, m, km, in, ft, yd, Miles
How do you measure distances? Yeah, that’s easy, right up until the day you live in a country that uses feet instead of meters and … Read More
Pipe Velocity Calculator: Flow Rate to Fluid Speed (V=Q/A)
If you flip on a faucet and hear a distinctive whining sound through the walls, then you’re also hearing what’s happening: Water is flowing at … Read More
Coulomb Force Calculator: Solve F, Charge, or Distance
The force between two atoms is immense. Yet the static shock you feel when touching a doorknob is tiny compared to it. But that tiny … Read More