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kDa Calculator — Convert Daltons to Kilodaltons & Estimate Protein Size
Convert between Da, kDa and MDa instantly, estimate protein molecular weight from amino acid count or gene length, and predict SDS-PAGE band position with a visual gel diagram
Use Calculator →chemistry
Reaction Rate Calculator — Rate Law, Integrated Rate Laws
compute rate=k[A]^m[B]^n, determine reaction order and rate constant by method of initial rates, solve integrated rate laws for zero/first/second order, and identify reaction order.
Use Calculator →chemistry
Boiling Point Elevation Calculator — ΔTb=Kbmi & Freezing Point Depression
compute ΔTb=Kb×m×i and ΔTf=Kf×m×i for any solvent, find molar mass by cryoscopy, calculate van't Hoff factor. Includes Kb/Kf tables for 10 solvents and van't Hoff factor presets for common solutes
Use Calculator →chemistry
Activation Energy Calculator — Arrhenius Equation, Ea & Rate Constant
solve k=Ae^(−Ea/RT) for any variable, find Ea using the two-point Arrhenius method, perform linear regression on Arrhenius plot (ln k vs 1/T), and visualize the potential energy diagram.
Use Calculator →chemistry
Half Life Calculator — Radioactive Decay, Carbon Dating & Decay Constant
solve N=N₀(½)^(t/t½) for any variable, calculate carbon-14 dating age, find decay constant λ, and reference half-lives for 25+ isotopes. Includes types of radioactive decay with nuclear equations.
Use Calculator →chemistry
Equilibrium Constant Calculator — Kc, Kp, ICE Tables & Q vs K
write Kc/Kp expressions, solve ICE table problems, convert Kp to Kc using Kp=Kc(RT)^Δn, and compare Q to K to predict reaction direction. with color-coded ICE tables.
Use Calculator →chemistry
Reaction Rate Calculator — Rate Law, Integrated Rate Laws
compute rate=k[A]^m[B]^n, determine reaction order and rate constant by method of initial rates, solve integrated rate laws for zero/first/second order, and identify reaction order.
Use Calculator →chemistry
Boiling Point Elevation Calculator — ΔTb=Kbmi & Freezing Point Depression
compute ΔTb=Kb×m×i and ΔTf=Kf×m×i for any solvent, find molar mass by cryoscopy, calculate van't Hoff factor. Includes Kb/Kf tables for 10 solvents and van't Hoff factor presets for common solutes
Use Calculator →chemistry
Activation Energy Calculator — Arrhenius Equation, Ea & Rate Constant
solve k=Ae^(−Ea/RT) for any variable, find Ea using the two-point Arrhenius method, perform linear regression on Arrhenius plot (ln k vs 1/T), and visualize the potential energy diagram.
Use Calculator →chemistry
Half Life Calculator — Radioactive Decay, Carbon Dating & Decay Constant
solve N=N₀(½)^(t/t½) for any variable, calculate carbon-14 dating age, find decay constant λ, and reference half-lives for 25+ isotopes. Includes types of radioactive decay with nuclear equations.
Use Calculator →chemistry
Equilibrium Constant Calculator — Kc, Kp, ICE Tables & Q vs K
write Kc/Kp expressions, solve ICE table problems, convert Kp to Kc using Kp=Kc(RT)^Δn, and compare Q to K to predict reaction direction. with color-coded ICE tables.
Use Calculator →chemistry
Stoichiometry Calculator — Mole Ratios, Limiting Reagent & Yields
Solve mole ratio, limiting reagent, theoretical yield, percent yield, and gram-to-gram word problems for any balanced chemical equation
Use Calculator →Physics
Ideal Gas Law Calculator — PV=nRT, Combined Gas Law
use the combined gas law (Boyle's, Charles's, Gay-Lussac's), find molar mass of unknown gases, and compare ideal vs real gas with Van der Waals equation.
Use Calculator →Physics
Pressure Calculator — P=F/A, Hydrostatic, Absolute vs Gauge
compute P=F/A (force per area), hydrostatic pressure P=ρgh at any fluid depth, convert between absolute and gauge pressure, find pressure altitude with ISA formula, and convert all pressure units (Pa, psi, bar, atm, mmHg)
Use Calculator →Physics
Free Fall Calculator — Distance, Time, Velocity & Terminal Velocity
compute fall time, distance, and velocity using v=gt, d=½gt², and v²=2gd. Includes terminal velocity calculator, reference table for falls from 10ft to 30,000ft, and comparison with/without air resistance
Use Calculator →Physics
Doppler Effect Calculator — Frequency, Shift & Doppler Equation
compute observed frequency using f'=f(v+v_o)/(v+v_s) for sound or the relativistic formula for light. Includes sign convention guide, ambulance example, redshift calculator, and animated wavefront simulation
Use Calculator →Physics
Buoyancy Calculator — Buoyant Force, Float or Sink & Water Displacement
Calculate buoyant force using Archimedes' principle (F=ρVg). Find whether an object floats or sinks, apparent weight in fluid, and fluid density from measurements.
Use Calculator →Physics
Photon Energy Calculator — E=hf, Wavelength to Energy
convert between photon energy (Joules, eV), frequency (Hz to THz), wavelength (nm, μm, Å), and wavenumber (cm⁻¹). Uses E=hf and E=hc/λ with full step-by-step working and EM spectrum classification.
Use Calculator →biology
kDa Calculator — Convert Daltons to Kilodaltons & Estimate Protein Size
Convert between Da, kDa and MDa instantly, estimate protein molecular weight from amino acid count or gene length, and predict SDS-PAGE band position with a visual gel diagram
Use Calculator →biology
Biodiversity Index Calculator — Shannon, Simpson & Species Richness
Calculates biodiversity indices from species abundance data including Shannon-Wiener diversity Simpson's diversity species richness Compares biodiversity between two communities.
Use Calculator →biology
Isoelectric Point Calculator — pI from Protein or Peptide Sequence
pI from any protein or peptide sequence, view the charge vs pH curve, compute net charge at any pH, and use the MCAT pI formula.
Use Calculator →biology
Protein Molecular Weight Calculator — From Sequence or Formula
Calculate protein molecular weight from amino acid sequence or formula. Includes amino acid MW table, extinction coefficient at 260nm, and nmol-to-μg conversion.
Use Calculator →biology
Chi-Square Calculator — Goodness of Fit, Test of Independence & Critical Values
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 →biology
Hardy-Weinberg Calculator — Allele & Genotype Frequency Solver
Solve p, q, p², 2pq, q² from any known value recessive phenotype frequency, allele frequency, or observed counts Includes genotype frequency calculator, allele frequency calculator, and phenotype frequency calculator
Use Calculator →Mathematics
Asymptote Calculator — Vertical, Horizontal & Slant Asymptotes
find all vertical, horizontal, and slant (oblique) asymptotes of rational functions Shows degree comparison for HA, denominator zeros for VA, and polynomial long division for slant asymptotes
Use Calculator →Mathematics
Simplify Radicals Calculator — Simplify √ Expressions Step by Step
Reduce any radical to simplest radical form, add and subtract like radicals, multiply and rationalize, and solve radical equations.prime factorization and perfect square methods
Use Calculator →Mathematics
Rational Expressions Calculator — Simplify,Add,Subtract,Multiply
simplify, add, subtract, multiply, and divide rational expressions with full step-by-step LCD calculation, factoring, cross-cancellation, and excluded values shown
Use Calculator →Mathematics
Extrema Calculator — Local Max, Min & Absolute Extrema with Steps
Find local maxima, local minima, and absolute extrema of any function using first and second derivative tests. Shows critical points, sign chart, and concavity analysis.
Use Calculator →Mathematics
Gaussian Elimination Calculator — Row Reduction & Matrix Solver
Solve systems of linear equations using Gaussian elimination with partial pivoting. Shows every row operation step, reduced row echelon form, and solution verification.
Use Calculator →Mathematics
Absolute Value Calculator — Equations, Inequalities & Graph
Calculate absolute value of numbers and expressions. Solves absolute value equations |ax+b|=c and inequalities |x|<k with number line diagrams
Use Calculator →Why Students Choose Us
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