Tan Calculator

The tangent function (tan) is the ratio of the opposite side to the adjacent side, equivalent to sin(θ)/cos(θ). Tangent represents the slope of the line from the origin to a point on the unit circle

The calculator uses the standard published formula for tan calc. Results are accurate to the precision of the inputs you provide. For financial, medical, or legal decisions, always verify with a qualified professional.

This calculator works with inches. You can enter values in the units shown — the calculator handles all conversions internally.

The core formula is: tan(θ) = opposite / adjacent = sin(θ) / cos(θ). Each step in the calculation is shown so you can verify the result manually.