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- 3D model scale calculatorFind the percentage scale setting needed to change a model dimension to your target size.
- A/B test calculatorCompare two independent conversion rates using a pooled two-proportion z statistic and two-sided approximate p-value.
- Algebra calculatorSolve a × x + b = c and check the substitution.
- Angle between two vectors calculatorThe angle is arccos of the dot product divided by both vector magnitudes.
- Angle of elevation calculatorFind the angle above horizontal from a vertical rise and a horizontal distance: angle = atan(rise ÷ distance).
- Area calculatorAdd areas of rectangular, circular and triangular parts to measure a compound surface.
- Aspect ratio calculatorResize dimensions without stretching: target height = target width × original height ÷ original width.
- Atoms to moles calculatorConvert a count of atoms or molecules to moles using n = particles/Nₐ.
- Average rate of change calculatorAverage rate of change = (second y − first y) ÷ (second x − first x).
- Bayes theorem calculatorUpdate a prior probability with the likelihood of an observation under an event and its complement.
- Board game score calculatorAdd each player’s round scores and rank totals, with a highest-wins or lowest-wins setting.
- Central limit theorem calculatorFind the mean and standard error of a sampling distribution: SE = population SD/√n.
- CFM calculatorCalculate volumetric airflow in CFM from duct area × average air velocity.
- Coterminal angle calculatorReduce an angle to 0 ≤ θ < 360° by adding or subtracting complete turns.
- Cross product calculatorCompute the three-dimensional cross product u × v using the right-hand rule.
- Derivative calculatorDifferentiate a polynomial and evaluate its slope at x.
- Dilution calculatorUse C₁V₁ = C₂V₂ to find how much stock solution is needed for a target concentration and final volume.
- Displacement calculatorDisplacement = initial velocity × time + ½ × acceleration × time².
- Distance calculatorDistance between two planar points = √((x₂ − x₁)² + (y₂ − y₁)²).
- Dot product calculatorThe dot product adds the products of matching vector components.
- Double angle calculatorCalculate sin(2θ), cos(2θ) and tan(2θ) from an angle in degrees.
- Empirical rule calculatorFind the mean ± one, two and three standard deviations for a proposed normal model.
- Endpoint calculatorThe missing endpoint equals twice the midpoint minus the known endpoint, component by component.
- Equation of a line calculatorFind the line through two points: slope = (y₂ − y₁)/(x₂ − x₁), then y = mx + b.
- Expected value calculatorWeight possible outcomes by their probabilities.
- Exponential decay calculatorProject repeated proportional loss with remaining = initial × (1 − loss rate)ⁿ.
- Exponential growth calculatorProject compound growth with final = initial × (1 + rate)ⁿ.
- Fibonacci sequence calculatorFind Fₙ exactly with F₀ = 0, F₁ = 1 and Fₙ = Fₙ₋₁ + Fₙ₋₂.
- Flow rate calculatorVolumetric flow rate = volume ÷ elapsed time.
- Golden ratio calculatorSplit a total length in the golden ratio φ = (1 + √5)/2.
- Grams to moles calculatorConvert grams to moles with amount = mass ÷ molar mass.
- Graph functions onlinePlot a function, adjust the window and inspect a value.
- Half angle calculatorCalculate the sine, cosine and tangent of half your angle in degrees.
- Half life calculatorFind what remains after a chosen time: remaining = initial × 2^(−time/half-life).
- Impulse calculatorImpulse = average net force × time interval.
- Integral calculatorIntegrate a polynomial and calculate a signed area between bounds.
