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Browse the tool catalog - Math, Date & Finance | Page 39

Calculators, numerics, date logic, statistics, and finance tools Page 39.

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Math & Numbers

Dimensional Analysis Unit Cancellation Tutor

Step-by-step factor-label unit cancellation with inverted-factor diagnosis and optional student-answer checking.

Math & Numbers

Doppler Effect Calculator (Frequency Shift)

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

Math & Numbers

Electronvolt to Joule

Convert electronvolts to joules with configurable precision

Math & Numbers

Effect Size Calculator

Calculate Cohen d, Hedges g, Cohen h for proportions, or correlation r effect sizes from summary statistics

Math & Numbers

Dot Product Calculator

Compute the dot product, cosine similarity, and angle between two vectors

Math & Numbers

Divisibility Calculator

Check whether one integer is divisible by another and show the quotient, remainder, and optional divisibility hint

Calculator

Elevation Calculator

Calculate elevation statistics from a list of elevation points

Math & Numbers

Discount Calculator

Calculate discounted prices, savings, and final price after applying percentage or fixed amount discounts

Math & Numbers

Electricity Calculator

Calculate electricity costs based on power consumption and usage time

Math & Numbers

Energy Unit Converter

Convert between different energy units (joules, calories, kilowatt-hours, BTU, etc.)

Finance

Dividend Calculator

Calculate dividend income, yield, and total returns from stock investments

Math & Numbers

Cylinder Radial Heat Conduction (Q=2πkL·ΔT/ln(r₂/r₁))

Compute radial steady-state heat conduction through a single-layer cylindrical wall (Fourier's law in cylindrical coordinates): radial heat flow rate Q = 2π·k·L·ΔT/ln(r₂/r₁) (W), inner-surface heat flux q_inner = Q/(2π·r₁·L) (W/m²), outer-surface heat flux q_outer = Q/(2π·r₂·L) (W/m²), and cylindrical thermal resistance R = ln(r₂/r₁)/(2π·k·L) (K/W). k is the thermal conductivity (W/(m·K)); L the cylinder length; r₁ the inner radius, r₂ the outer radius (must have r₂ > r₁ > 0); ΔT the temperature difference (K; a °C difference equals a K difference, a °F difference is converted by ×5/9). ΔT may be negative (indicating reverse heat flow), but k, L, r₁ and r₂ must be positive. Length and radius in m/cm/mm.