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197 Free Tools

Math & Science Tools

Every math & science tool on Online Tool Store, in one place. Runs entirely in your browser — nothing is ever uploaded.

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ANOVA Calculator

Quick, free ANOVA Calculator in your browser

Boat Displacement Calculator

Quick, free Boat Displacement Calculator in your browser

Button State Generator

Quick, free Button State Generator in your browser

Aperture F-Stop Converter

Compare f-stops: stop difference, light ratio, T-stop

Complex Number Calculator

Quick, free Complex Number Calculator in your browser

Element Symbol Flashcards

Quick, free Element Symbol Flashcards in your browser

Firearm Ballistic Coefficient Converter

Quick, free Firearm Ballistic Coefficient Converter in

Gas Law Calculator

Quick, free Gas Law Calculator in your browser

Heat Exchanger Sizing Estimator

Quick, free Heat Exchanger Sizing Estimator in your browser

Lens Focal Length Calculator

Quick, free Lens Focal Length Calculator in your browser

Miter Angle Calculator

Quick, free Miter Angle Calculator in your browser

Negotiation Range Calculator

Quick, free Negotiation Range Calculator in your browser

Normal Distribution Visualizer

Quick, free Normal Distribution Visualizer in your browser

Poisson Distribution Calculator

Quick, free Poisson Distribution Calculator in your browser

Polynomial Root Finder

Quick, free Polynomial Root Finder in your browser

Radioactive Decay Calculator

Quick, free Radioactive Decay Calculator in your browser

Router Bit Speed Reference

Quick, free Router Bit Speed Reference in your browser

Star Trail Exposure Calculator

Quick, free Star Trail Exposure Calculator in your browser

Tent Capacity Guide

Quick, free Tent Capacity Guide in your browser

True Airspeed Calculator

Quick, free True Airspeed Calculator in your browser

Work Week Number Calculator

Quick, free Work Week Number Calculator in your browser

Fabric Yardage Calculator

Quick, free Fabric Yardage Calculator in your browser

Projectile Motion Calculator

Range and flight time from launch values

Square Root Simplifier

Simplify radicals into exact form

Binary Operations Calculator

Perform bitwise operations with binary values

Significant Figures Counter

Count and round significant figures

Parallelogram Calculator

Compute area and perimeter quickly

Exponent Calculator

Calculate powers and roots

Percentage Change Calculator

Measure increases and decreases

Quadratic Equation Solver

Set up ax2 + bx + c roots

Fibonacci Generator

Create a Fibonacci sequence

Factorial Calculator

Find n! with a clear formula

Standard Deviation Calculator

Measure variation in a dataset

Binary Calculator

Binary arithmetic and bitwise operations

Rank Calculator

Rank a list with 4 tie methods, CSV export

Surface Area Calculator

Surface areas for common 3D solids

Combination Calculator

Calculate nCr combinations with the formula shown

Distance Between Points

2D and 3D coordinate distance

Percentage Calculator

All percent problems in plain language

Average Calculator

Mean, median, and mode from a number list

Area Calculator

Calculate area for five common 2D shapes

Scientific Calculator

Full-function calculator with history

Matrix Calculator

Multiply matrices, and find determinants and inverses

Probability Calculator

Calculate single, combined, and repeated-event probabilities

Ratio Calculator

Solve and scale proportional ratios

Slope Calculator

Slope and line equation from two points

Volume Calculator

Volumes of 3D solids from dimensions

Circle Calculator

Area, circumference, radius conversions

Fraction Calculator

Add, subtract, multiply and divide fractions

Permutation Calculator

nPr arrangements with explanations

Variance Calculator

Calculate variance and standard deviation from data

Number Sequence Finder

Detect the pattern and predict the next terms

Correlation Calculator

Measure Pearson correlation between two series

Weighted Average Calculator

Calculate averages with custom weights

Triangle Solver

Solve triangle sides, angles, area, and perimeter

Molar Mass Calculator

Find molecular weight from a chemical formula

Hex Calculator

Add and subtract hexadecimal numbers

Long Division Calculator

Step-by-step long division working

Fraction Simplifier

Reduce fractions to lowest terms

Prime Factorization Tool

Break numbers into prime factors

Chemical Equation Balancer

Balance chemical reactions with whole-number coefficients

Derivative Calculator

Symbolic derivatives with steps

Pythagorean Theorem Calculator

Solve any side of a right triangle

Midpoint Calculator

Midpoint coordinates with formula

Rounding Tool

Round to any decimal place or multiple

Limit Evaluator

Numerically estimate a function's limit

Z-Score Calculator

Z-score, percentile, and interpretation from a value

Logarithm Calculator

Any base, with the working and the rounding shown

Scientific Notation Converter

Convert values between notation styles

System of Equations Solver

System of Equations Solver

Ohm's Law Calculator

Ohm's Law Calculator

Illuminance Converter

Illuminance Converter

Resistor Color Code Calculator

Resistor color code calculator, 3-6 bands

Fraction to Decimal Converter

Exact decimals, with repeating blocks marked properly

Integral Calculator

Definite integrals computed numerically

Function Grapher

Plot y=f(x) equations interactively

Prime Number Checker

Test primality and list nearby primes

Outlier Detector

IQR, z-score and MAD together, because they disagree

GCF and LCM Calculator

Greatest common factor, least multiple

Periodic Table Explorer

Interactive element data and trends

Confidence Interval Calculator

Calculate a confidence interval for a sample mean

Trapezium Calculator

Area, perimeter, and height of a trapezium

Three-Phase Power Calculator

Convert between kW, kVA, current, and voltage

Earthing Resistance Calculator

Estimate earth electrode resistance

Heat Sink Calculator

Size a heat sink from thermal resistance

RF Link Budget Calculator

Work out an RF link budget and margin

Monte Carlo Simulator

Run a random simulation over your assumptions

Monty Hall Simulator

Monty Hall simulator: see why switching wins

Algebra Simplifier

Simplify an algebraic expression step by step

Unit Circle Explorer

See sine, cosine, and tangent on the unit circle

Random Walk Simulator

Watch a random walk unfold and spread

Buffer pH Calculator

Buffer pH: solve pH or the ratio for target pH

Solubility Rules Reference

Look up whether a salt dissolves in water

Specific Heat Calculator

Calculate heat energy for a temperature change

Time Dilation Calculator

Calculate relativistic time dilation

Sound Speed Calculator

Speed of sound in air, water, and solids

Crop Water Requirement Calculator

Estimate irrigation water a crop needs

Lowest Common Denominator Calculator

Find the LCD to add or compare fractions

Beam Load Calculator

Check bending and deflection on a simple beam

Motor Starting Method Selector

Choose a starting method for an induction motor

Battery State of Charge Chart

Read state of charge from resting voltage

Nyquist Sampling Calculator

Find the sample rate a signal needs

Servo Pulse Calculator

Convert servo angle to pulse width

Power Supply Ripple Calculator

Size a smoothing capacitor for a rectifier

Margin of Error Calculator

Find the margin of error for a survey result

Knapsack Solver

Choose the best-value items within a limit

Number Properties Lookup

See the properties of any whole number

Taylor Series Expander

Expand a function as a Taylor series

Empirical Formula Calculator

Find an empirical formula from percentages

Bond Energy Calculator

Estimate reaction enthalpy from bond energies

Reynolds Number Calculator

Calculate Re and identify the flow regime

Psychrometric Calculator

Work out humidity, dew point, and wet bulb

Telescope Magnification Calculator

Match eyepieces to your telescope

Compass Declination Calculator

Convert between magnetic and true bearings

Decimal to Fraction Converter

Convert a decimal to a simplified fraction

Boolean Truth Table Generator

Generate truth tables from logical expressions

IEEE 754 Float Inspector

Break down a float's sign, exponent and mantissa bits

Motor Full Load Current Calculator

Calculate motor full load current from power

Battery Bank Configurator

Plan series/parallel battery bank configuration

ADC Resolution Calculator

Calculate ADC step size from resolution and range

Capacitor Discharge Calculator

Calculate capacitor voltage during discharge

Effect Size Calculator

Calculate Cohen's d effect size between two groups

Linear Programming Solver

Two-variable linear programming input preview

Collatz Sequence Explorer

Generate the Collatz sequence for a number

Function Domain & Range Finder

Find the domain and range of a function

Ellipse Calculator

Calculate ellipse area, perimeter, and eccentricity

Oxidation Number Calculator

Determine oxidation numbers in a compound

Hess's Law Calculator

Calculate reaction enthalpy using Hess's Law

Bernoulli Calculator

Solve pressure, velocity, or height with Bernoulli

Rocket Equation Calculator

Calculate delta-v using the Tsiolkovsky rocket equation

Fraction Visualizer

See a fraction and its parts clearly

Bayes Theorem Calculator

Update probabilities with new evidence

Travelling Salesman Visualizer

Map routes and compare shortest paths

Continued Fraction Calculator

Continued fraction calculator: decimal to a/b

Differential Equation Solver

Solve common ODEs with step-by-step output

Percent Composition Calculator

Break compounds down by mass percent

Isotope Abundance Calculator

Estimate isotopic composition and average mass

Pipe Friction Loss Calculator

Estimate pressure drop in piping

Earthquake Energy Calculator

Convert magnitude into released energy

Astro Exposure Calculator

Astro exposure calculator: the 500 Rule for stars

Exposure Triangle Calculator

Balance ISO, shutter speed, and aperture

Trend & Seasonality Decomposer

Break a time series into components

Heat Transfer Calculator

Calculate conductive heat transfer through a material

Probability Tree Builder

Build a probability tree diagram across multiple events

Buck Boost Duty Cycle Calculator

Calculate the duty cycle for a buck-boost converter

SWR & Return Loss Calculator

Convert between SWR, return loss, and reflection coefficient

Adjacency Matrix Tool

Convert between a graph's edge list and adjacency matrix

Arbitrary Precision Calculator

Big number calculator — exact BigInt arithmetic

Fourier Series Visualizer

Visualize a waveform built from summed sine harmonics

Titration Curve Simulator

Plot a pH titration curve for an acid-base reaction

SMILES Structure Viewer

Render a 2D molecule structure from a SMILES string

Doppler Shift Calculator

Calculate the observed frequency shift from relative motion

Battery CCA Guide

Match cold cranking amps to vehicle requirements

Birthday Paradox Calculator

Calculate shared-birthday probability for a group

Breaker Selection Guide

Recommend circuit breaker size from load

Chaos Attractor Visualizer

Render chaotic attractors like Lorenz or Rössler

Density & Buoyancy Calculator

Calculate object density and buoyant force

Escape Velocity Calculator

Calculate escape velocity from mass and radius

EV Range Estimator

Estimate EV driving range from battery and conditions

Fabric Cutting Layout Optimizer

Optimize fabric layout to minimize waste

Fertilizer NPK Calculator

Calculate fertilizer blend ratios by NPK

Field of View Calculator

Calculate camera/lens field of view

Free Space Path Loss Calculator

Calculate RF free-space path loss in dB

Gutter Sizing Calculator

Size roof gutters based on catchment area

Inequality Solver

Solve linear inequalities with a visual number line

Livestock Feed Ration Calculator

Balance feed rations using the Pearson Square method

Markov Chain Calculator

Compute transition matrices and steady states

Origami Paper Size Calculator

Find the right starting square for your origami model

Paddy Yield Estimator

Project rice harvest yield using the IRRI formula

Polygon Area From Coordinates

Compute area and perimeter using the Shoelace formula

Power Factor Correction Calculator

Size capacitor banks to correct lagging power factor

Reaction Rate Calculator

Reaction rate calculator with a concentration-time chart

Room Lighting Calculator

Estimate room lumens and light fixture count

Screed Calculator

Calculate floor screed volume, cement bags, and sand

Thermal Expansion Calculator

Calculate linear and volumetric expansion from temperature change

Towing Capacity Checker

Check tongue weight and payload against safe towing limits

Interest Rate Solver

Solve for the unknown interest rate given other loan variables

Binomial Distribution Calculator

Calculate binomial probabilities, PMF, and CDF

Slope-Intercept to Standard Form Converter

Convert linear equations between slope-intercept and standard form

Enzyme Kinetics Calculator

Calculate reaction velocity using the Michaelis-Menten equation

Trigonometric Identity Verifier

Check trig identity transformations

Meteor Shower Calendar

Track meteor shower peak nights

Free Fall Time Calculator

Calculate falling time and speed

Constellation Finder by Season

Find constellations by season

Projectile Range Optimizer

Optimize launch angle and range

Vector Calculator

Compute dot product and magnitude for 2D/3D vectors

Dimensional Analysis Checker

Verify a formula's units balance on both sides

Chi-Square Test Calculator

Test observed counts against expected values

Jewelry Metal Weight Estimator

Estimate metal weight for a jewelry design before casting

Star Magnitude Brightness Comparator

Compare how much brighter one star is than another by magnitude

Terminal Velocity Estimator

Estimate an object's terminal velocity from mass, area, and drag

Satellite Pass Predictor (Manual TLE)

Predict a satellite's next visible pass from TLE data

Electric Field Strength Calculator

Calculate electric field strength from a point charge

Center of Mass Calculator

Calculate the center of mass for a system of point masses

Buffer Recipe Calculator

Calculate acid-to-base ratios for a target pH buffer

Simple Circuit Voltage Divider Calculator

Calculate output voltage from a two-resistor voltage divider

Apparent vs Absolute Magnitude Converter

Convert between a star's apparent and absolute magnitude