Free calculators for Chemistry, Physics, Biology & Math with step-by-step solutions. Trusted by 100,000+ students worldwide.
Suggested Calculators
Free chi-square calculator — run goodness of fit tests and tests of independence with full (O−E)²/E working tables, p-values, critical values, and Cramér's V effect size. Supports contingency tables up to 6×6
Use Calculator →Free arc length calculator — find arc length of circle arcs (s=rθ), functions (∫√(1+f'²)dx), parametric and polar curves. Also finds radius from arc length using the sagitta-chord formula. Full step-by-step working
Use Calculator →Standard atmosphere calculator — find temperature, pressure, density, and speed of sound at any altitude using the ISA model. Includes density altitude calculator, pressure altitude converter, and full ISA reference table from sea level to 80km
Use Calculator →Air properties calculator — find density, dynamic viscosity, kinematic viscosity, specific heat (cp, cv), thermal conductivity, Prandtl number, and speed of sound at any temperature. Includes molar mass of air (28.9647 g/mol) and a complete reference table from −50°C to 1000°C
Use Calculator →Free density calculator — solve ρ=m/V for density, mass, or volume, find density of cylinders and spheres, use water displacement, and look up water density in kg/m³, lb/ft³, g/cm³, and lb/gal at any temperature
Use Calculator →Free uniform circular motion calculator — solve for period, frequency, angular velocity, centripetal acceleration, centripetal force, and normal force. Full UCM formula reference and AP Physics 1 worked examples
Use Calculator →Free dilution factor calculator. Solve C1V1=C2V2 equations, calculate dilution ratios (1:10, 1:50), serial dilutions, and cell dilutions. Instant recipe box showing exactly how to prepare your solution
Use Calculator →reaction order calculator solve zero order, first order, and second order integrated rate laws, calculate half-life, find rate constant k, and determine reaction order from experimental data with step-by-step working
Use Calculator →Free reaction order calculator solve zero order and first order kinetics equations, calculate half-life, determine reaction order from data. Includes integrated rate law solver and graphs.
Use Calculator →partial pressure calculator use Dalton's Law and mole fraction to find partial pressure of any gas. Includes ideal gas law method, gas mixture analyzer, and pressure unit converter.
Use Calculator →find the percent composition by mass of any compound from its chemical formula or mass data. Step-by-step working with examples and practice problems.
Use Calculator →Free empirical formula calculator - find the empirical and molecular formula from percent composition or element masses. Step-by-step working with examples for every calculation.
Use Calculator →Free arc length calculator — find arc length of circle arcs (s=rθ), functions (∫√(1+f'²)dx), parametric and polar curves. Also finds radius from arc length using the sagitta-chord formula. Full step-by-step working
Use Calculator →Standard atmosphere calculator — find temperature, pressure, density, and speed of sound at any altitude using the ISA model. Includes density altitude calculator, pressure altitude converter, and full ISA reference table from sea level to 80km
Use Calculator →Air properties calculator — find density, dynamic viscosity, kinematic viscosity, specific heat (cp, cv), thermal conductivity, Prandtl number, and speed of sound at any temperature. Includes molar mass of air (28.9647 g/mol) and a complete reference table from −50°C to 1000°C
Use Calculator →Free density calculator — solve ρ=m/V for density, mass, or volume, find density of cylinders and spheres, use water displacement, and look up water density in kg/m³, lb/ft³, g/cm³, and lb/gal at any temperature
Use Calculator →Free uniform circular motion calculator — solve for period, frequency, angular velocity, centripetal acceleration, centripetal force, and normal force. Full UCM formula reference and AP Physics 1 worked examples
Use Calculator →Free force calculator solve F = ma for force, mass or acceleration, calculate net force from multiple forces, find applied force with friction, and compute average force using impulse-momentum theorem. Full step-by-step working
Use Calculator →Free chi-square calculator — run goodness of fit tests and tests of independence with full (O−E)²/E working tables, p-values, critical values, and Cramér's V effect size. Supports contingency tables up to 6×6
Use Calculator →Free Hardy-Weinberg calculator. Solve p, q, p², 2pq, q² from any known value — recessive phenotype frequency, allele frequency, or observed counts — with complete step-by-step working. Includes genotype frequency calculator, allele frequency calculator, and phenotype frequency calculator
Use Calculator →Free Punnett square calculator and generator. Create 2×2 monohybrid, 4×4 dihybrid, 8×8 trihybrid, and 16×16 quadhybrid crosses instantly. Includes ABO blood type, X-linked, and special cross modes with step-by-step results
Use Calculator →Free DNA molecular weight calculator compute MW from sequence or length, convert between ng/µL, nM, and pmol, calculate DNA concentration and purity from A260/A280 spectrophotometer readings. Supports dsDNA, ssDNA, and RNA
Use Calculator →Free reverse complement calculator for DNA and RNA sequences. Find the complement, reverse, and reverse complement instantly. Supports IUPAC ambiguity codes, FASTA input, GC content, palindrome detection, and DNA-to-mRNA transcription
Use Calculator →Predict your puppy's adult weight and size category based on breed, current weight, and age
Use Calculator →Free variance calculator. Calculate sample variance (÷n−1) or population variance (÷n), coefficient of variation (CV%), and variance percentage (% change between two numbers) — with complete step-by-step working for each
Use Calculator →Free margin of error calculator. Find MOE from sample statistics or proportions using MOE = z*(or t*) × standard error, build a confidence interval, or solve the required sample size for a target margin of error — with full step-by-step working
Use Calculator →Free standard error calculator. Calculate the standard error of the mean (SEM = s/√n) or the standard error of estimate for regression (SEE = √(SSres/(n−k−1))) with complete step-by-step working
Use Calculator →Free critical value calculator for t, z, and chi-square distributions. Find t critical values, z critical values, and chi-square critical values instantly with confidence level or alpha input, step-by-step working, and printable reference tables
Use Calculator →Free t-test calculator for one-sample, two-sample (independent), and paired t-tests. Get the t statistic, degrees of freedom, p-value, critical value, and a clear reject/fail-to-reject decision with full step-by-step working.
Use Calculator →Free polar to rectangular calculator. Convert polar coordinates (r,θ) to rectangular (x,y) and back — with step-by-step working, quadrant-correct atan2 handling, complex number form, and degree/radian toggle
Use Calculator →Complete Laplace transform table and inverse Laplace table cheat sheet. All standard transform pairs, properties, and operational rules. Print-friendly reference for engineering and math students
Master Hardy-Weinberg equilibrium with 10 fully worked practice problems. Learn the 5 conditions for Hardy-Weinberg equilibrium and step-by-step problem solving methods
Complete guide to de Broglie wavelength and wave-particle duality learn the de Broglie equation, how matter has wave properties, and worked examples from electrons to everyday objects
Free chemistry, physics, biology & math calculators with step-by-step solutions. Trusted by 100,000+ students. Solve any science problem instantly!
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