Home & construction
Water use
Water use: Liters per day = flow × minutes × uses
THE WHOLE TOOLKIT
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Dates & time
Weekday count
Weekday count: Count Monday–Friday in [start,end); no holiday exclusions
Business & selling
Weekly hours and overtime payroll worksheet
Weekly hours and overtime payroll worksheet: Split each person’s entered weekly hours at the chosen threshold.
Math & statistics
Weighted average
Weighted average: Σ(value × weight) ÷ Σweights
Math & statistics
Weighted median
Weighted median with an explained formula, a worked example and checks for invalid or unsupported inputs.
Business & selling
Weighted supplier scorecard
Weighted supplier scorecard: Require a weight for every score column and a total weight of 100%.
Math & statistics
Welch two-sample t statistic and degrees of freedom
Welch two-sample t statistic and degrees of freedom: Set a = s₁²/n₁ and b = s₂²/n₂.
Text & writing
Whitespace cleanup
Whitespace cleanup: Trim leading/trailing whitespace and replace internal whitespace runs with one space
Text & writing
Word and character count
Word and character count: Count whitespace-delimited words and Unicode code points
Text & writing
Word frequency counter
Word frequency counter locally in your browser, with clear input requirements, a worked example and an explanation of the result.
Dates & time
Work shift hours and unpaid breaks
Calculate paid shift hours and minutes from start/end times, unpaid breaks and an explicit overnight option.
Business & selling
Working capital and current ratio
Working capital and current ratio: enter your own figures, see the result and calculation method, and check the model’s assumptions.
Money & borrowing
Year-by-year variable-return drawdown
Year-by-year variable-return drawdown: For each entered year apply its return to the current balance, then take the entered year-end withdrawal.
Math & statistics
Z-score standardization
Express an observation as the number of population standard deviations above or below the mean.
Math & statistics
Real nth root
Real nth root: Solve y^n = x over the real numbers.
Math & statistics
Exponential decay and remaining amount
Exponential decay and remaining amount: Remaining amount = initial amount × 2^(−elapsed time / half-life).
Math & statistics
Exponential growth doubling time
Exponential growth doubling time: Doubling time = ln(2) / ln(1 + growth/100), with a strictly positive growth rate.
Math & statistics
Circular sector area
Circular sector area: Sector area = π × radius² × central angle / 360 for angles from zero through 360 degrees.
Math & statistics
Circular arc length
Circular arc length: Arc length = radius × angle in radians = radius × angle in degrees × π/180.
Math & statistics
Ellipse area
Ellipse area: Ellipse area = π × semi-major axis × semi-minor axis.
Math & statistics
Ellipsoid volume
Ellipsoid volume: Ellipsoid volume = (4/3) × π × a × b × c, where a, b and c are the three semi-axes.
Math & statistics
Circular frustum volume
Circular frustum volume: A circular cone frustum has volume πh(R² + Rr + r²)/3.
Math & statistics
Torus volume
Torus volume: For a ring torus, volume = 2π² × major radius × tube radius².
Math & statistics
Distance from a point to a line
Distance from a point to a line: For line ax + by + c = 0, perpendicular distance is |ax₀ + by₀ + c| / √(a² + b²).
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