Quilt Binding Calculator
Compute the inches of binding required (perimeter + overlap), the number of 2½-inch strips needed cut from a 42-inch wid...
Compute the inches of binding required (perimeter + overlap), the number of 2½-inch strips needed cut from a 42-inch wid...
Compute pressure as force per unit area in pascals, with quick conversions to common engineering units.
Calculates target heart rate training zones using the Heart Rate Reserve (HRR) method. Enter lower and upper intensity p...
Compute the percentile rank of a chosen value within a list of numbers — the percentage of values that fall at or below...
Calculates optimal bedtimes for waking up after complete 90-minute sleep cycles to minimise sleep inertia.
Calculates the Nyquist (minimum) sampling rate f_s = 2·f_max. For audio (20 kHz) → 40 kHz; CD standard = 44.1 kHz. Also...
Compute Euler's totient φ(n) — the count of integers in 1..n coprime to n — directly from the prime factorisation. Enter...
Calculates portfolio return E[R_p] = w₁R₁ + w₂R₂ and variance σ²_p = w₁²σ₁² + w₂²σ₂² + 2w₁w₂ρσ₁σ₂ for two assets with gi...
Compute the mechanical work done by a constant force over a displacement, including the cosine factor for off-axis force...
Compute the log-odds (logit) of a probability p: logit(p) = ln(p/(1−p)). The logit maps (0,1) to (−∞, +∞) and is the inv...
Compute the mean, variance, mode and standard deviation of a Beta(α, β) distribution from its two shape parameters.
Compute the hypergeometric PMF P(X = k) for sampling n items without replacement from a population of N containing K suc...
Every "X% of Y" problem, every "what percent of", every percent-change question — written out the way you'd actually say them.
Standard deviation is "average distance from the average". That one sentence covers 90% of everything you ever need to remember about it.