Compute the back-EMF and electromagnetic torque of a DC motor from its machine constant: E=k·ω, T=k·I. In SI units the back-EMF constant equals the torque constant (k_e=k_t=k, V·s/rad=N·m/A). Also returns the mechanical (air-gap) power P=T·ω=E·I. Speed accepted in rad/s or RPM.

Math & Numbers

Beam Deflection Calculator

Look up and compute the maximum deflection for four classic beam cases: cantilever with end point load (δ=PL³/3EI), cantilever with UDL (δ=qL⁴/8EI), simply supported with mid-span point load (δ=PL³/48EI), and simply supported with UDL (δ=5qL⁴/384EI).

Finance

Debt Payoff Calculator

General-purpose debt payoff planner comparing avalanche, snowball, and minimum-only strategies. Enter debts as 'name, balance, APR%, minPayment $' per line plus an extra monthly payment. Shows payoff time, total interest, savings, balance decline curves, and a per-debt repayment detail table.

Finance

Depreciation Calculator

Compare four depreciation methods side by side: straight-line, declining balance (with multiplier, e.g. 2 for DDB), sum-of-the-years'-digits (SYD), and units of production (when yearly usage is provided). Shows book-value curves and a year-by-year depreciation table.

Math & Numbers

Decibel Calculator (Power Ratio, Voltage Ratio, dBm/dBu/dBV)

Convert between ratios and decibels (10·log power, 20·log amplitude), and across absolute units dBm/dBW/dBV/dBu/dBFS/SIL

Math & Numbers

Density Calculator (ρ = m/V)

Compute density, mass, or volume from the other two, with specific gravity and a float/sink check

Math & Numbers

Degrees to Arcminutes

Convert degrees to arcminutes with configurable decimal precision

Math & Numbers

Degrees to Arcseconds

Convert degrees to arcseconds with configurable decimal precision

Math & Numbers

Degrees to Gradians

Convert degrees to gradians with configurable decimal precision

Math & Numbers

Degrees to Radians

Convert degrees to radians with configurable decimal precision

Math & Numbers

Days to Hours

Convert days to hours with configurable decimal precision

Math & Numbers

Days to Months

Convert whole days to exact calendar months from a specified start year and month