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Browse the tool catalog - Math, Date & Finance | Page 44

Calculators, numerics, date logic, statistics, and finance tools Page 44.

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Math & Numbers

Energy Unit Converter

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

Finance

Ethereum Address Validator

Check if a string is an Ethereum address. Does not validate address checksums.

Finance

Dividend Calculator

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

Calculator

Dice Probability Calculator

Calculate probabilities for dice rolls and combinations

Math & Numbers

Derivative Calculator

Calculate derivatives of common functions

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.

Math & Numbers

DC Motor Back-EMF & Torque Calculator (E=kω, T=kI)

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.

Finance

Currency Exchange Calculator

Convert an amount between currencies using live exchange rates from a free, no-key API (open.er-api.com). Supports 160+ world currencies. Shows the converted amount, the exchange rate used, a comparison table against popular currencies, and the rate update timestamp.

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.

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

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