Pay & allowances
Pay rise and salary increase
See your new annual salary and the monthly increase from a proposed percentage pay rise.
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Everyday arithmetic
Percentage
Percentage: value × percentage ÷ 100
Everyday arithmetic
Percentage change
Percentage change: (new − original) ÷ |original| × 100
Everyday arithmetic
Percentage difference
Percentage difference: Absolute difference ÷ arithmetic mean × 100
Everyday arithmetic
Percentage points
Percentage points: New rate minus original rate, in percentage points
Math & statistics
Percentile with linear interpolation
Percentile with linear interpolation with an explained formula, a worked example and checks for invalid or unsupported inputs.
Math & statistics
Permutations
Permutations: n! ÷ (n−r)!; order matters
Physics & engineering
Pipe flow velocity
Pipe flow velocity using clearly labeled inputs, with the formula, a worked example and practical limits explained.
Physics & engineering
Pipe internal capacity
Pipe internal capacity: Treat the internal bore as a cylinder: volume = π × (internal diameter / 2)² × length.
Physics & engineering
Pipe Reynolds number
Pipe Reynolds number using clearly labeled inputs, with the formula, a worked example and practical limits explained.
Digital quantities
Pixel density
Pixel density: PPI = √(width² + height²) ÷ physical diagonal
Web & design
Pixels and rem converter
Pixels and rem converter with editable inputs, an explained method, a worked example and clearly stated output limits.
Home & construction
Plant spacing grid count
Plant spacing grid count: Place plant centers half a spacing from each boundary.
Math & statistics
Poisson event probability
Poisson event probability with an explained formula, a worked example and checks for invalid or unsupported inputs.
Math & statistics
Polynomial definite integral by Simpson’s rule
Polynomial definite integral by Simpson’s rule: Composite Simpson’s rule: h/3 × [f(a)+f(b)+4Σ odd interior samples+2Σ even interior samples], evaluating the entered polynomial with Horner’s method.
Math & statistics
Polynomial value and derivative
Polynomial value and derivative: Evaluate coefficients with Horner’s method.
Home & construction
Pool and tank filling time
Pool and tank filling time using clearly labeled inputs, with the formula, a worked example and practical limits explained.
Money & borrowing
Portfolio rebalancing trade worksheet
Portfolio rebalancing trade worksheet: Target value = (sum of current values + new cash) × target weight.
Unit converters
Power converter
Power converter: result = amount × source factor ÷ destination factor. Factors are relative to W.
Math & statistics
Powers and roots
Powers and roots: Raise the base to the supplied real exponent
Home & construction
Premixed concrete bag quantity
Premixed concrete bag quantity: Bags = ceil(required m³ × 1000 × (1+waste fraction) / stated litres of wet yield per bag).
Money & borrowing
Present value of an annuity
Present value of an annuity: enter your own figures, see the result and calculation method, and check the model’s assumptions.
Unit converters
Pressure converter
Pressure converter: result = amount × source factor ÷ destination factor. Factors are relative to Pa.
Math & statistics
Prime factorization
Decompose a positive whole number into prime factors, exponents and the number of positive divisors.
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