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Find calculations and practical tools relevant to education & research. Check the method, units and limits before using a result.
Laboratory Dilution CalculatorCalculate stock volume using C₁V₁ = C₂V₂.Density CalculatorMass per unit volumeKinetic EnergyKinetic energy from mass and velocityGravitational Potential EnergyPotential energy near EarthMolarityMolarity from moles and solution volumeSolute Mass from MolarityMass needed for a target molaritySurvey Response RateCompleted surveys as percentage of invitationsTraining Completion RateCompleted training count divided by eligible staffLaboratory coefficient of variation (CV)Laboratory & diagnostics · Quality · Compare standard deviation with mean control value.Diagnostic sensitivityLaboratory & diagnostics · Quality · Compare true positives with true positives plus false negatives.Diagnostic specificityLaboratory & diagnostics · Quality · Compare true negatives with true negatives plus false positives.Positive predictive valueLaboratory & diagnostics · Quality · Compare true positives with true positives plus false positives.Negative predictive valueLaboratory & diagnostics · Quality · Compare true negatives with true negatives plus false negatives.Laboratory specimen rejection proportionLaboratory & diagnostics · Quality · Locally defined measure of laboratory specimen rejection proportion.Laboratory turnaround-time complianceLaboratory & diagnostics · Quality · Locally defined measure of laboratory turnaround-time compliance.Pupil-teacher ratioEducation · Utilization · Compare enrolled pupils at the specified education level with teachers at the same education level.Gross enrolment ratioEducation · Access · Compare students enrolled at the specified level, regardless of age with population of the official age group for that level.Net enrolment rateEducation · Access · Compare official-age students enrolled at the specified level with population of the official age group for that level.School completion rate (reference-age population)Education · Quality · Compare people in the reference age group who completed the level with people in the reference age group.Examination pass rateEducation · Quality · Locally defined measure of examination pass rate.Student attendance session rateEducation · Quality · Locally defined measure of student attendance session rate.Required data-field completenessResearch, data & AI · Quality · Locally defined measure of required data-field completeness.Data rule validity rateResearch, data & AI · Quality · Locally defined measure of data rule validity rate.Study follow-up retentionResearch, data & AI · Quality · Locally defined measure of study follow-up retention.Survey completion among startersResearch, data & AI · Quality · Locally defined measure of survey completion among starters.Binary classifier accuracyResearch, data & AI · Quality · Locally defined measure of binary classifier accuracy.Standard score (z score)z = (x − mean) / SDStandard error of a meanSE = sample SD / √nCohen d from a supplied pooled SDd = (mean₁ − mean₂) / pooled SDUnadjusted odds ratio from 2×2 countsOR = ad / bcCrude risk ratio from two cohortsRR = (events₁/total₁) / (events₂/total₂)Percentage point changeChange = new percent − old percentRelative percentage changeChange = (new − baseline) / baseline × 100Two-component weighted scoreScore = (score₁×weight₁ + score₂×weight₂)/(weight₁+weight₂)Study session duration from a time budgetMinutes per session = total hours × 60 / sessionsAssessment marks percentageScore = marks earned / maximum marks × 100Word Frequency CounterCount words without sending text anywhere.CSV Cleaner, Statistics & ParetoClean duplicate rows, summarise numeric data, chart a sequence and count categories.ZIP Compressor & ExtractorCreate ZIP files or open a ZIP with its password. Keep your original files.PowerPoint CompressorReduce embedded image size in PPTX. Also supports DOCX and XLSX.Office File CompressorRecompress images in PowerPoint, Word and Excel files.Excel Sheet & Workbook UnlockerRemove worksheet and workbook editing protection from an unencrypted XLSX file. File-open passwords are not removed.PDF Compressor & OptimiserLossless object-stream optimisation for readable, unsigned PDFs; size reduction varies.Audio ToolsChange the format, make files smaller or edit a clip. Your file stays on your device.Video ToolsChange the format, make files smaller or edit a clip. Your file stays on your device.GIF ToolsChange the format, make files smaller or edit a clip. Your file stays on your device.Professional Worksheet StudioEditable logs, action plans and cost/ratio worksheets for 48 work areas. Save your own layout and export CSV.