1)   Off The Road Winch Load Calculator 1
OTR Trading has made this winch load calculator available to you for you to work out the load that a 4x4 winch would take based on the parameters you feed it. You can use this 4x4 winch load calculator on an electric or hydraulic winch scenario.
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 2)   Off The Road Metric Tire Size Calculator 1
As any 4x4 or car enthusiast should know, when you are dealing with formulas dealing with gear ratios and such - you will need to know the tire diameter in inches; this calculator will offer just that.
4x4, winch, tire, dimension, calculator,

 3)   4x4Calc 1.00
4x4OffRoads.com - 4x4 Off Road Calculator Use this program for calculations for your modifications project. It currently has three mini-calculators. Select your calculator by clicking on the various tabs.
4x4, off road, 4 wheeling,