Math & Numbers
Solve wavelength, frequency, or wave speed from v=f·λ, with derived period, angular frequency, wave number, and photon energy
wavelength-calculatorMath & Numbers
Calculate divider output voltage, solve for R1 or R2, and evaluate load effects with a circuit diagram
voltage-divider-calculatorMath & Numbers
Compute cable voltage drop from current, length, conductor size (AWG/mm²) and material, for DC, single-phase and three-phase circuits
voltage-drop-calculatorMath & Numbers
Convert watts to horsepower with configurable decimal precision
watt-to-hpMath & Numbers
Convert watts to kilowatts with configurable decimal precision
watt-to-kwMath & Numbers
Convert weeks to days with configurable decimal precision
weeks-to-daysMath & Numbers
Calculate weighted GPA from credits, grades, and course rigor bonuses for honors, AP, or IB classes
weighted-gpa-calculatorMath & Numbers
Run a paired nonparametric Wilcoxon signed-rank test from paired samples or differences
wilcoxon-signed-rank-calculatorMath & Numbers
Run Welch two-sample t tests for independent groups with unequal variances from raw data or summary statistics
welch-t-test-calculatorMath & Numbers
Calculate a winsorized mean by capping extreme low and high values before averaging
winsorized-mean-calculatorMath & Numbers
Calculate a weighted average from paired values and weights, with contribution and normalized weight details
weighted-average-calculatorMath & Numbers
Calculate water costs based on usage and water rates
water-bill-calculator