Math & Numbers
Calculate the break-even point for a product or business based on fixed costs, variable costs, and price
break-even-calculatorFinance
Calculate bond current yield and yield to maturity (YTM)
bond-yield-calculatorMath & Numbers
Convert between different angle units (degrees, radians, gradians, minutes, seconds, etc.)
angle-converterMath & Numbers
Convert between different area units (square meters, square feet, acres, hectares, etc.)
area-converterFinance
Generate detailed loan amortization schedule with payment breakdown
amortization-scheduleFinance
Calculate annuity payments, present value, and future value
annuity-calculatorMath & Numbers
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.
ahu-capacity-calculatorMath & Numbers
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.
admittance-calculatorMath & Numbers
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.
active-earth-pressureMath & Numbers
Convert acres to square meters with configurable decimal precision
acre-to-square-meterMath & Numbers
Convert acres to hectares with configurable decimal precision
acre-to-hectareMath & Numbers
Convert acres to square feet with configurable decimal precision
acre-to-square-feet