RV Leveling Calculator

A bubble level reading doesn't tell you which wheels to shim, so this calculator turns two off-level readings into four wheel-specific block heights. Front-to-Back Off Level and Side-to-Side Off Level are each treated as a direct height difference, not an angle -- the sign tells the engine which end is already higher, and the magnitude becomes the block height for the opposite end. A positive Front-to-Back reading raises only Rear Block Height; a negative reading raises only Front Block Height instead, and the same split applies side-to-side between Left and Right Block Height. Because each axis only ever raises one of its two ends, Front-to-Back Off Level is the sole driver of Rear Block Height (and, when negative, of Front Block Height), with Side-to-Side Off Level playing no role in either.

Wheelbase and Track Width are collected for reference only -- since the off-level readings are already direct height differences rather than angles measured over a distance, the block-height math never needs to convert them through the RV's dimensions, so changing either one leaves every block height and the wheel-position count completely unchanged. Wheel Positions Needing Blocks counts how many of the four positions are nonzero, so it can hold steady across a range of off-level readings before a big enough change pushes a position from zero to needing a block (or the reverse). This doesn't replace physically checking the bubble level after blocking -- ground slope and tire pressure both shift the reading.