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Truenumber calculator with units and tolerance
Use this technical calculator anytime you need to do a quick calculation involving units or tolerances. It is part of a hosted version of the truenumber platform designed to help companies work with and manage engineering numbers. Developed specifically for engineers, this calculator stores parameters and calculated result as truenumber hyperlinks.
Read the instructions below and click each example to open it in the calculator. Then hit [Enter] button to do the calculation.
How to enter simple calculations w/o parameters
Calculations always need to be in curly-baces { }. Try these examples:
or, use square-brackets [ ] to enter numbers with units
We hope you'll provide a subject and a property for what you are calculating (if you don't, it will)
area of my yard = {[342 ft] * [125 +/- 1.5 m]} yd^2
Or enter a simple truenumber (not a calculation at all - no curly braces)
resistivity of tungsten = 52.8e-9 ohm m
How to enter calculations with parameters
In this expression, the built-in constant $g is the earth's gravitational acceleration, and t is a parameter.
HINT: In the calculator, click the
icon to see the keypad. It lists all available functions, operators and constants.
length of fall = {1/2*$g*t^2} ft
Enter it into the calculator and a box for parameter t will appear. In it, type time of fall = 3 sec then hit the Set t button to see your answer. (or enter time of fall = 3 +/- 0.1 sec to see tolerance in action)
We'll store your numbers and formulas*
As long as cookies are enabled in your browser, your list of truenumbers and calculations will be saved and will be there whenever you return to the site*.
*NOTE: This is a free demo version of the Truenumber calculator. We use browser cookies to enable storage of your data for your convenience, but with no guarantees it will always be there. Cookies are fragile, and we reserve the right to remove this demo service and/or your data without notice. To get a robust repository for numbers and formulas that you can share with your co-workers, sign up at top right for a hosted numberspace trial. The first 30 days are free.