Compute the total, sensible, and latent capacity of an air-handling-unit (AHU) coil from the entering/leaving air state and the dry-air mass flow ṁ_da. Total capacity Qt = ṁ_da·(h1 − h2); sensible capacity Qs = ṁ_da·cp_ma·(T1 − T2) with cp_ma ≈ 1.006 + 1.86·W [kJ/(kg da·K)]; latent capacity Ql = Qt − Qs; Sensible Heat Ratio SHR = Qs / Qt. Each state is described by dry-bulb T plus one humidity input (relative humidity φ, or humidity ratio W); W is derived from the Magnus saturation fit when RH is supplied, and enthalpy h = 1.006·T + W·(2501 + 1.86·T) [kJ/kg da]. Signed result — works for cooling or heating coils.

Math & Numbers

RLC Admittance Calculator (Y = G + jB)

Compute complex admittance Y = 1/Z = G + jB for series or parallel RLC circuits: G = R/|Z|², B = −X/|Z|². Returns conductance, susceptance, magnitude and phase angle. Supports any subset of R/L/C.

Math & Numbers

Active Earth Pressure (Rankine)

Calculate the Rankine active earth pressure on a smooth vertical wall backfilled with cohesionless soil. K_a = tan²(45°−φ/2). Optional uniform surcharge q. Returns the base pressure p₀, the total force P, and the resultant height.

Math & Numbers

Acre to Square Meter

Convert acres to square meters with configurable decimal precision

Math & Numbers

Acre to Hectare

Convert acres to hectares with configurable decimal precision

Math & Numbers

Acre to Square Feet

Convert acres to square feet with configurable decimal precision

Math & Numbers

Adjusted R-Squared Calculator

Calculate adjusted R squared from R squared, sample size, and predictor count

Math & Numbers

Absolute Value Calculator

Calculate the absolute value of positive, negative, or decimal numbers and explain the sign relationship