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 calculator8 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 calculatorMass–spring period
Solve the ideal mass–spring oscillator relationship for period, spring constant or attached mass, with full working.
Open calculatorCapacitor discharge
Calculate voltage, elapsed time or time constant for an ideal RC discharge, including half-life and logarithmic working.
Open calculatorSnell’s law
Use Snell’s law to solve refractive index or refracted angle, with degree/radian handling shown explicitly.
Open calculatorMotion graph segment
Analyse a straight segment of a velocity–time or position–time graph for acceleration, displacement or average velocity.
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