A better way to check your lab work
Free Physics Calculators
with Full Working
Uncertainties, regression, statistics and laboratory quantities — with the steps between your data and your answer.
9 calculators
Uncertainty & measurement
From instrument readings to a defensible final result. Convert, combine and report measurement uncertainty.
Repeated measurements & timing
Calculate mean, range, half-range uncertainty and uncertainty per cycle, with an explicit instrument floor and comparison to SEM.
Open calculatorInstrument readings & zero error
Correct a zero offset and estimate reading uncertainty using a stated resolution convention or supplied instrument uncertainty.
Open calculatorAgreement within uncertainty
Compare two measurement intervals or a result with an accepted value. Check overlap and see the numerical gap with a careful conclusion.
Open calculatorPercentage uncertainty
Convert absolute uncertainty into percentage uncertainty. See the formula, substituted values and a correctly rounded measurement.
Open calculatorAbsolute uncertainty
Find absolute uncertainty from a measured value and percentage uncertainty, with full working and matched decimal-place rounding.
Open calculatorUncertainty propagation
Propagate uncertainties for sums, differences, products, quotients and powers using school-lab rules, with all working shown.
Open calculatorPercentage error & difference
Calculate percentage error against an accepted value or percentage difference between two values. Compare definitions and see the working.
Open calculatorSignificant figures
Round decimal or scientific-notation numbers to 1–15 significant figures. Understand leading zeros, trailing zeros and halfway rounding.
Open calculatorGradient uncertainty
Find gradient uncertainty from maximum and minimum acceptable slopes, plus percentage uncertainty and a rounded best-gradient result.
Open calculator5 calculators
Statistics & data
Turn repeated measurements into a mean, a spread and a fitted relationship. Keep the assumptions in view.
Error bars & acceptable lines
Plot x and y uncertainty bars, test a candidate line against every rectangle, and find maximum/minimum gradients and intercept bounds.
Open calculatorLinearization & log plots
Transform both axes with squares, roots, reciprocals or logarithms. Propagate uncertainties, fit a line and export processed data.
Open calculatorGraph gradient, area & prediction
Find segment gradients, linearly interpolate or extrapolate, and estimate signed area with trapezoids. See each interval and its working.
Open calculatorStandard deviation & error
Calculate mean, population and sample standard deviation, and standard error from a list of measurements, with formulas and full working.
Open calculatorLinear regression
Fit a straight line to two-column data. Calculate slope, intercept, R², Pearson r and coefficient standard errors with a graph and working.
Open calculator4 calculators
Physics
Check laboratory quantities with clear SI conversions and formulas you can follow.
SI units & dimensional checks
Convert simple and compound physics units, expand derived SI units, and detect incompatible dimensions with transparent scale factors.
Open calculatorPhysical constants from gradients
Turn a graph gradient into g, spring constant, resistivity or an exponential time scale, with first-order propagated uncertainty.
Open calculatorPendulum period
Calculate a simple pendulum period from length, or length from period. Choose length units and gravitational acceleration, with full working.
Open calculatorResistivity & resistance
Solve wire resistance, resistivity, length or area. Enter cross-sectional area or circular-wire diameter and see every SI unit conversion.
Open calculatorUseful for the report. Better for understanding it.
Each tool includes the formula, defined variables, a worked example and common mistakes. Built for high-school and introductory university labs, including students studying IB Physics and AP Physics.
Read the calculation and rounding conventions