Math & Numbers
Raise a base to any real exponent, with optional scientific notation and verification details
power-calculatorMath & Numbers
Round numbers to integers, decimal places, tens, or hundreds using a simple rounding mode selector
rounding-calculatorMath & Numbers
Solve proportion equations of the form a/b = c/d and calculate the missing term
proportion-calculatorMath & Numbers
Calculate percent error between an experimental value and a reference value
percent-error-calculatorMath & Numbers
Calculate the percentage decrease between an original value and a new value
percentage-decrease-calculatorMath & Numbers
Calculate the percentage increase between an original value and a new value
percentage-increase-calculatorDate & Time
Expand RRULE-based VEVENT recurrence into concrete occurrences and export them as JSON or a flattened ICS calendar
ics-calendar-recurrence-rule-expanderMath & Numbers
Run simple linear regression on paired numeric data and inspect slope, intercept, correlation, and predictions
regression-calculatorMath & Numbers
Table lookup of the unilateral Z-transform for 11 standard pairs, with parameter substitution, region of convergence, derivation note, and optional numeric X(z₀) evaluation.
z-transform-calculatorMath & Numbers
Solve Young's modulus (modulus of elasticity) in the linear-elastic region using E = σ/ε (Hooke's law). Three directions: modulus E = σ/ε, stress σ = E·ε, strain ε = σ/E. Pick the unknown, supply the other two positive values. Result in MPa with a GPa reading (e.g. steel ≈ 200 000 MPa).
youngs-modulus-calculatorMath & Numbers
Convert therms to kilowatt-hours with configurable decimal precision
therm-to-kwhMath & Numbers
Convert whole calendar years to exact days from a specified start year
years-to-days