Serial Dilution Model
Calculate concentration and overall dilution after repeated identical dilution steps.
ChemistryOpen tool ↗THE FEUTEX TOOLKIT
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First-Order Reaction Progress
Calculate concentration, converted fraction and half-life for an ideal first-order process.
ChemistryOpen tool ↗Second-Order Reaction Progress
Calculate concentration and half-life for a single-reactant second-order rate law.
ChemistryOpen tool ↗Arrhenius Temperature Rate Comparison
Estimate a rate-constant ratio between temperatures for a supplied activation energy.
ChemistryOpen tool ↗Beer–Lambert Absorbance
Calculate absorbance and transmission from concentration, optical path and molar absorptivity.
ChemistryOpen tool ↗Colligative Temperature Shifts
Calculate ideal freezing-point depression and boiling-point elevation from molality.
ChemistryOpen tool ↗Ideal Osmotic Pressure
Estimate osmotic pressure and effective osmolar concentration for a dilute solution.
ChemistryOpen tool ↗Two-Body Thermal Equilibrium
Calculate equilibrium temperature and transferred heat for two isolated thermal masses.
ChemistryOpen tool ↗Photon Energy and Photon Count
Calculate photon energy and number of photons in a monochromatic energy packet.
ChemistryOpen tool ↗Two-Isotope Mean Atomic Mass
Calculate abundance-weighted atomic mass and isotope contribution for a two-isotope model.
ChemistryOpen tool ↗Initial Great-Circle Bearing
Calculate the initial true bearing between two nonidentical geographic points.
GeospatialOpen tool ↗Geometric Horizon Distance
Estimate geometric horizon range and angular dip from observer altitude.
GeospatialOpen tool ↗Web Mercator Position
Project latitude and longitude to spherical Web Mercator meter coordinates.
GeospatialOpen tool ↗Map Scale Ground Resolution
Calculate printed map scale from ground resolution and print density.
GeospatialOpen tool ↗Geographic Raster Cell Area
Estimate a latitude-longitude cell area on a spherical Earth.
GeospatialOpen tool ↗Terrain Slope and Surface Distance
Compare horizontal distance, elevation gain, slope grade and sloped path length.
GeospatialOpen tool ↗Survey Coordinate Offset
Resolve a measured distance and north-referenced bearing into east and north coordinate changes.
GeospatialOpen tool ↗Nadir Camera Ground Footprint
Estimate a flat-ground imaging footprint and ground sample distance from camera geometry.
GeospatialOpen tool ↗Crosswind and Headwind Components
Resolve a wind vector relative to a course using user-supplied speed and relative angle.
GeospatialOpen tool ↗Carnot Heat Engine Limit
Estimate the upper efficiency bound and ideal work from hot and cold reservoir temperatures.
EnergyOpen tool ↗Net Radiative Heat Exchange
Calculate ideal radiative heat transfer between a surface and a large surrounding enclosure.
EnergyOpen tool ↗Ventilation Sensible Heat Loss
Estimate sensible heat carried by an outdoor-air flow before and after heat recovery.
EnergyOpen tool ↗Wind Rotor Power Scenario
Estimate incident wind power and extracted power using a chosen power coefficient.
EnergyOpen tool ↗Activity Emissions Scenario
Calculate gross emissions, avoided emissions and net emissions from user-supplied factors.
EnergyOpen tool ↗Centrifuge Relative Force
Calculate radial acceleration and relative centrifugal force from rotor radius and speed.
LaboratoryOpen tool ↗Independent Transfer Uncertainty
Combine independent absolute uncertainties for repeated equal-volume transfers.
LaboratoryOpen tool ↗Blank-Corrected Linear Calibration
Estimate concentration from sample signal, blank and a supplied linear calibration slope.
LaboratoryOpen tool ↗Single-Spike Standard Addition
Estimate original concentration from unspiked and spiked responses with dilution correction.
LaboratoryOpen tool ↗Chromatography Peak Resolution
Estimate separation resolution between two peaks using baseline widths.
LaboratoryOpen tool ↗PDF to GIF Converter
Render selected PDF pages as GIF animation with adjustable frame timing.
PDFOpen tool ↗PDF to PNG Converter
Render selected PDF pages as PNG images and download individually or together in a ZIP.
PDFOpen tool ↗PDF to JPG Converter
Render selected PDF pages as JPG images and download individually or together in a ZIP.
PDFOpen tool ↗PDF to WEBP Converter
Render selected PDF pages as WEBP images and download individually or together in a ZIP.
PDFOpen tool ↗PDF to TEXT Converter
Extract embedded text from selected PDF pages into a plain-text download without uploading your document.
PDFOpen tool ↗JPG to GIF Converter
Convert JPG images to a GIF animation with ordered frames, adjustable width and frame timing.
ImagesOpen tool ↗PNG to GIF Converter
Convert PNG images to a GIF animation with ordered frames, adjustable width and frame timing.
ImagesOpen tool ↗WEBP to GIF Converter
Convert WEBP images to a GIF animation with ordered frames, adjustable width and frame timing.
ImagesOpen tool ↗JPG to PNG Converter
Convert JPG images to PNG files with local processing and batch ZIP download.
ImagesOpen tool ↗PNG to JPG Converter
Convert PNG images to JPG files with local processing and batch ZIP download.
ImagesOpen tool ↗WEBP to PNG Converter
Convert WEBP images to PNG files with local processing and batch ZIP download.
ImagesOpen tool ↗WEBP to JPG Converter
Convert WEBP images to JPG files with local processing and batch ZIP download.
ImagesOpen tool ↗WAV File Inspector
Read sample rate, bit depth, channels, duration, peak level, RMS level and DC offset from an actual WAV file.
AudioOpen tool ↗WAV Audio Trimmer
Cut a WAV recording to a start/end time and export a sample-aligned audio file.
AudioOpen tool ↗Reverse WAV Audio
Reverse the frame order of a WAV file while keeping its channels aligned.
AudioOpen tool ↗WAV Fade In and Fade Out
Apply linear fades at the beginning and end of a WAV recording.
AudioOpen tool ↗WAV Peak Normalizer
Adjust WAV amplitude to a target peak in dBFS, preserving relative channel levels.
AudioOpen tool ↗Stereo WAV to Mono
Average the channels of a multichannel WAV recording into one mono channel.
AudioOpen tool ↗WAV Channel Extractor
Extract a numbered audio channel from a WAV recording into a mono WAV file.
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