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

Doppler Effect Calculator (Frequency Shift)

Compute observed frequency and frequency shift for a moving source and/or observer

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

Enzyme Kinetics Calculator (Michaelis-Menten)

Calculate reaction velocity with Michaelis-Menten, estimate Km/Vmax via Lineweaver-Burk, and model enzyme inhibition.

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

Electronvolt to Joule

Convert electronvolts to joules with configurable 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