Free tool
Convert between metric and imperial units across the categories that actually show up in engineering coursework - length, mass, pressure/stress, torque, and volume flow rate - not just the everyday conversions a generic converter covers.
Updates live as you typeEnter a value to convert.
Encodr works just as well for engineering coursework as for pre-med - build a deck from your own notes and let spaced repetition handle the review.
Get started freeMost of the world standardized on SI (metric) units decades ago, but US engineering practice, imperial-unit legacy equipment, and a lot of published reference material still run in feet, pounds, and psi. Rather than pick a side, most engineering programs teach both and expect you to convert fluently between them - which is where a mismatch actually costs points, not in the underlying physics. Torque and pressure conversions in particular mix base units in ways that are easy to get backwards under time pressure (a newton-meter is not a newton, and a pascal is not a psi), so this tool works off the same underlying SI base unit for every category rather than a lookup table of every possible pair.
Why engineering courses keep both unit systems alive, and the conversions that actually come up in coursework.
The two formulas behind every error-analysis section: one for addition and subtraction, one for multiplication and division.
Spaced repetition and retrieval practice were tested on word lists and vocabulary, not just MCAT content - what carries over to engineering, business, and art courses.
How to prepare for an intro college physics exam: learn equations with their conditions, practice from a blank page, mix problem types and check every answer.
How to use PV = nRT, which value of R to pick, the unit conversions that trip people up, and worked examples for P, V, n, T and molar mass.
Enter two measurements with their uncertainties to see the propagated uncertainty in a sum, difference, product, or quotient.
Open tool →Enter any three of displacement, initial velocity, final velocity, acceleration and time to solve the other two, with the equation shown.
Open tool →Enter launch speed, angle and height to get time of flight, range, maximum height and impact velocity, with the working shown.
Open tool →Equivalent resistance for 2 to 8 resistors in series or parallel, plus current, voltage drop and power for each one.
Open tool →Solve 1/f = 1/do + 1/di for the focal length, object or image distance, with magnification and whether the image is real or virtual.
Open tool →