Subject topic
Research & Fieldwork
Observation, transect, quadrat, sampling, coding, survey and data-planning tools.
20 tools in this topicMake research effort and summary calculations reproducible. The hub combines five new research tools with survey, randomization, averaging and data-list utilities; the simple results are prompts for protocol and statistical review, not substitutes for it.
Calculators
13
Weighted Average CalculatorCalculate a weighted average from values and weights.Average CalculatorFind the mean of a list of numbers.Normal Distribution CalculatorCalculate probability below, between and above entered bounds for a normal model with visible z-scores.Mechanical Power CalculatorConvert work over time into average watts, kilowatts and mechanical horsepower without hidden efficiency.Hydrostatic Pressure CalculatorCalculate gauge and absolute pressure at depth for a static constant-density fluid.Sample Size CalculatorEstimate completed responses for a proportion from confidence, margin, prevalence and population inputs.Margin of Error CalculatorEstimate an uncorrected normal-approximation margin for a sample proportion and confidence level.Linear Thermal Expansion CalculatorEstimate signed length change, final length and relative expansion from temperature change.Variance CalculatorCalculate population variance, sample variance and sample standard deviation from a browser-local number list.Confidence Interval CalculatorEstimate a two-sided mean interval from sample mean, standard deviation, size and a preset level.Density Mass Volume CalculatorSolve for density, mass or volume from the other two values while keeping the unit relationship explicit.Ideal Gas Law CalculatorSolve PV equals nRT for pressure, volume, amount or absolute temperature with fixed SI units.Matrix Determinant CalculatorCalculate the determinant and trace of an entered three-by-three matrix and identify singular cases.
Other tools
1Other tools
3
Molarity CalculatorSolve molarity, solute moles or final solution volume with explicit mole-per-liter definitions.Half-Life CalculatorSolve remaining amount, elapsed time or half-life for a constant first-order exponential decay model.Beer-Lambert Law CalculatorSolve absorbance, molar absorptivity, path length or concentration and inspect ideal transmittance.