STP Online Calculator
Groschopp’s torque calculator (STP online conversion calculator) provides a fast, easy way to calculate speed, torque or power. The most commonly used units can be selected and conversions are automatically and accurately generated. Download the desktop version for full use of the tool, including unit conversions, efficiency calculations and more. Visit our resources page for more engineering tools.
The MOTORTEC™ STP conversion calculator provides a fast, easy way to calculate speed, torque, or power. You can select conversions based on the most commonly used units and automatically generate results that can be printed out.
- Calculate Speed, Torque and Power
- Calculate Estimated Electrical Current and Losses for Optimum Motor Selection
- Easily and Accurately Convert Units of Measurement
- Customizable, Printed Report Function
- Calculate Operating Costs.
STP reports are detailed and comprehensive, as well as customizable.
Speed, Torque and Power Calculations:
Rotational devices such as motors and gearmotors are given specifications in relationship to speed, torque and horsepower. The relationship between these variables follows the equation below.
There are a number of web sites that give additional information on the history of Horsepower and its calculation by searching the key word “horsepower”.
STPe can also be used simply as a tool to reliably and accurately convert units.
Calculating Electrical Input and Losses
STP has an added feature to calculate estimated input power and losses. Based on the power requirements determined in the STP calculation, additional information can be entered in the Electrical Input and Loss calculator, to estimate electrical values based on the efficiency of the system.
Calculating Annual Operating Cost:
To calculate the annual operating cost, it is first necessary to enter the following operational parameters:
STP uses this data to calculate total Hours/Year operation. The button marked “Get KWh Rate” links to the U.S. Department of Energy website for electrical power rates by location. The selected kWh rate should be entered into the $/kWh data field for final calculation of annual operating cost.
Conversions used in the program are listed below (STP calculations are accurate to nine decimal places)
- pi = 3.141…
- 1 Pound = 16 Ounces
- 1 Foot = 12 Inches
- 1 Inch = 2.54 Centimeters
- 1 Meter = 100 Centimeters
- 1 rpm = 2 pi / 60 radians
- 1 Newton = 100,000 Dynes
- 1 Newton = 0.2248… Pounds Force
- 1 hp = 745.6998… Watts