Free Math & Science Tools
111 free maths and science tools — Ohm's law, physics formulas, LCM/GCD, circle calculator, fraction calculator, periodic table, half-life and more.
Whether you need to solve a triangle from two known sides, calculate force from mass and acceleration, find the LCM and GCD of a set of numbers, compute radioactive half-life decay, look up an element's electron configuration on an interactive periodic table, or convert significant figures — LazyTools has a free maths and science tool for it. All 111 tools run in your browser with step-by-step working shown.
From free geometry calculators for circles, triangles and vectors to physics formula solvers, chemistry unit converter, fraction calculator and interactive periodic table — this collection covers the maths and science calculations that students, teachers and professionals need, with formulas and working shown for every result.
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Free Online Maths and Science Tools: The Complete Student and Teacher Guide
LazyTools offers 50 free, browser-based maths and science tools that go beyond calculation — they show the working, explain the formula used and display results in meaningful units. All run client-side with no account required, making them practical for classroom use, mobile devices and situations with limited connectivity.
Free Ohm's Law Calculator for Electronics
The free Ohm's Law Calculator solves all four combinations of the Ohm's law and power law relationship: enter any two of voltage (V), current (I), resistance (R) and power (P) and it calculates the remaining two. Supports all standard electrical units with built-in unit conversion: V/mV/kV, A/mA/uA, ohm/kohm/Mohm, W/mW/kW. Covers the most common electronics calculations: finding the right resistor value for an LED circuit, calculating component current draw, or finding the power dissipation of a resistor.
Free LCM and GCD Calculator
The free LCM and GCD Calculator computes both the Least Common Multiple and Greatest Common Divisor (Highest Common Factor) for up to 10 numbers simultaneously, displaying the prime factorisation of each number alongside the result. The LCM is needed for fraction common denominators, scheduling repeating events with different periods, and gear ratio calculations. The GCD/HCF is needed for simplifying fractions, splitting quantities into equal groups, and cryptographic applications. Both are computed using the efficient Euclidean algorithm with step-by-step display.
Free Triangle and Circle Calculators
The free Triangle Calculator handles any combination of known values — SSS (three sides), SAS (two sides and included angle), SSA (two sides and non-included angle — the ambiguous case, showing both solutions where they exist), or ASA/AAS (two angles and one side) — deriving all remaining sides, angles, area, perimeter and altitude using the law of cosines, law of sines and Heron's formula. The free Circle Calculator derives area, circumference, diameter, arc length and sector area from any one input value, extending to sphere surface area and volume.
Free Physics Formula Solver
The free Physics Formula Solver covers the most commonly needed physics formulas in solve-for-any-variable format: kinematics (distance, speed, time, acceleration, final velocity), Newton's second law (F=ma), momentum, kinetic energy, gravitational potential energy, work done, power and Hooke's law. Enter known quantities, select the variable to solve for — the tool rearranges the formula algebraically and computes the result with correct units. The Force Calculator applies Newton's second law and weight (W=mg) in the same flexible format. The Vector Calculator handles 2D and 3D vector operations: addition, dot product, cross product, magnitude and unit vector.
Free Interactive Periodic Table of Elements
The free Interactive Periodic Table displays all 118 elements colour-coded by category (alkali metals, alkaline earth metals, transition metals, post-transition metals, metalloids, nonmetals, halogens, noble gases, lanthanides and actinides). Click any element for a full data card: atomic number, atomic mass, electron configuration (standard and noble gas notation), electronegativity, atomic radius, ionisation energy, melting and boiling points, density, state at standard conditions, year and country of discovery, and common uses. Serves as both a quick reference tool and an educational resource for students learning periodic trends.
Free Scientific Notation, Significant Figures and Half-Life Calculators
The Scientific Notation Converter converts between standard decimal and scientific notation for numbers as large as 10^100 or as small as 10^-100. The Significant Figures Calculator rounds any number to a specified number of sig figs with the rounding step displayed explicitly — essential for chemistry and physics laboratory work. The Half-Life Calculator computes remaining quantity after radioactive decay using the exponential decay formula N(t) = N0 x (1/2)^(t/t-half). The Chemistry Unit Converter handles moles, grams and molecules for stoichiometry. The Equation Solver solves linear and quadratic equations with step-by-step algebraic working. The Fraction Calculator performs all four arithmetic operations on fractions and mixed numbers with full working shown.
Free Gardening and Horticulture Calculators
The Mulch, Compost and Soil Calculators convert area and depth into cubic yards, cubic feet and bag counts for any garden material — saving a trip back to the garden centre. The Plant Spacing Calculator and Bulb Spacing Calculator determine exact plant or bulb counts for square and triangular planting layouts with a 10% waste allowance. The Grass Seed Calculator covers 14 species with separate new-seeding and overseeding rates. The Sod Calculator gives pallet and roll counts with a configurable waste factor. The Potting Soil Calculator handles round, square and rectangular containers with output in both litres and US quarts.
Free Indoor Growing and Controlled Environment Calculators
The VPD Calculator (Vapor Pressure Deficit) computes kPa from temperature and relative humidity, classifying the result into growth-stage zones from seedling through flowering. The Daily Light Integral (DLI) Calculator converts PPFD to mol/m²/day or back — the correct metric for comparing grow lights and setting photoperiod targets. The CO2 Grow Room Calculator determines enrichment volume, daily CO2 usage and tank size requirements from room dimensions and target ppm. The Water Soluble Fertilizer Calculator converts NPK grade and target nutrient ppm into grams per gallon for hydroponics and fertigation applications.
Free Agriculture and Crop Science Calculators
The Corn Yield Calculator implements the standard yield component method — ears per acre, kernel rows and kernels per row — to estimate pre-harvest bushels per acre. The GDU Calculator (Growing Degree Units) applies the standard corn caps (Tmax 86°F, Tmin 50°F) and looks up the resulting growth stage from VE through R6 black layer. The Grain Conversion Calculator converts between bushels, pounds, short tons and metric tonnes for 10 grain species using USDA standard test weights. The Plant Population Calculator derives plants per acre from row and in-row spacing with crop benchmark comparison. The Fertilizer Calculator converts NPK grade and target nutrient rate into pounds per 1,000 sq ft and total purchase quantity. The Acres Per Hour Calculator applies the ASABE field efficiency factor to give effective coverage rate, time to complete a field and fuel cost estimate.
Free Forestry and Livestock Calculators
The Basal Area, Tree Height, Tree Diameter, Tree Age, Tree Spacing and Tree Value Calculators cover the core forestry measurement and valuation calculations used in stand assessment, plantation planning and timber appraisal. The Tree Leaves Calculator estimates total leaf count and Leaf Area Index (LAI) by species. For livestock management, the Animal Mortality Rate Calculator quantifies herd losses and economic impact. The Cattle Per Acre Calculator converts pasture area to stocking rate using Animal Unit Months (AUM). The Feed Conversion Ratio Calculator computes FCR, feed cost per kg of gain and days to target weight. The Livestock Fence Cost Calculator calculates material quantities and cost for any perimeter and fence type.