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`alpha = tan^-1( H / L )`

Enter a value for all fields

**IMPORTANT NOTE: **THIS CALCULATOR WAS UPDATED ON 9 NOV 2022 TO USE A HORIZONTAL LENGTH (L) TO SIMPLIFY THE MEASURING PROCESS.

The **Approach Angle** calculator computes the maximum angle (**α**) of a ramp onto which a vehicle can climb from a horizontal plane without interference (scraping) the ramp or incline.

**INSTRUCTIONS:** Choose units and enter the following:

- (
**h**) Height of Undercarriage (see diagram) - (
**L**) Length from Tire contact point to the point below the tail (see diagram)

**ANGLE (α):** The calculator returns the approach or departure angle in degrees. However, this can be automatically converted to other angle units (e.g. radians) via the pull-down menu.

You own an RV and want to take it up your driveway, but you DO NOT want to hear the crunch of bottoming out. The Approach Angle calculator computes the maximum angle your vehicle can approach based on two measurements, the height at the tail (H) and the length from the tire contact point and the point below the tail (L)

The formula for the Approach Angle is:

α = tan^{-1}(H/L)

where:

- α = Max Approach Angle
- H = Height of Undercarriage
- L = Length of Base from Tire to Point below Tail

Approach angle (α) is the maximum angle of a ramp onto which a vehicle can climb from a horizontal plane without interference. It is defined as the angle between the ground and the line drawn between the front tire and the lowest-hanging part of the vehicle at the front overhang. Approach angle is also referred to as ramp angles.

To calculate your approach angle, put your vehicle on a flat and level surface. Next, measure the height (H) and length (L). To measure the height (H) and length (L), mark the point directly below the end of the undercarriage at the tail of your vehicle. Measure the height from the undercarriage to that point, and the length from the center of the tire to that point. This only works if there is nothing (e.g., muffler tail pipe) that hangs down even lower. **α° = Approach angle: ß° = Departure angle**

* Break-over Angle (β )*

Camber Angle (Φ)

**Related Items:**

- See a YouTube video on how to use this calculator by clicking HERE.
**Approach (Departure) Angle calculator****Degree to Percent Grade****Camber angle**- Wheel camber (tilt) calculation of angle**Camber offset**- Wheel camber (tilt) calculation of offset**Breakover Angle****Time to Overtake:**Computes the time for one object to overtake another.**Distance to Overtake:**Computes distance traveled to overtake another.**Speed to Overtake:**Computes the average velocity to overtake another.**Distance Traveled:**Computes the distance traveled over a period of time.

Wikipedia - http://en.wikipedia.org/wiki/Approach_and_departure_angles