Tools
Config-driven calculators and helpers—each tool doubles as an explainer page for search and sharing. Jump into a subject hub or scroll the full catalog.
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Same grouping as your curriculum—e.g. chemistry calculators in one place.
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Alphabetical list of published utilities Showing 193–240 of 564.
- formula calculator
Excess reagent calculator
After reaction goes to completion, see how much of the non-limiting (excess) reactant remains.
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Expected value calculator
E and Var from outcomes and probabilities.
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Experimental bar preview
Simple horizontal bars from values.
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Experimental data analyzer
Mean, sample standard deviation, and SEM from a list of numbers.
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Experiment time (seconds)
Seconds to hours and minutes.
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Exponent calculator
Compute a^b.
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Exponential population growth
N = N₀e^{rt}.
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Faraday’s law (average EMF magnitude)
|ε|_avg = N |ΔΦ/Δt|.
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FASTA DNA summary
First FASTA record stats.
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Field line visualizer (lite)
Qualitative radial field circles for a point charge.
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First-order decay
N(t) = N₀e^{-kt}.
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Flashcard prompts
Front/back prompts for spaced repetition.
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Food chain (10% rule)
E_n = E₀ × 0.1^n.
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Force converter
N, kN, dyn, lbf.
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Force (F = ma)
Net force magnitude from mass and acceleration.
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Formula to alkane name (linear)
If the formula is C_nH_{2n+2}, return the parent alkane name.
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Fourier transform (reference)
Short Fourier facts.
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Fraction calculator
Add or multiply two fractions.
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Fraction to decimal
Numerator ÷ denominator.
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Freezing point depression calculator
ΔT_f from molality, i, and K_f (cryoscopic constant).
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Frequency converter
Hz, kHz, MHz, rpm, rad/s (via ω/2π).
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Frequency from period
f = 1/T.
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Functional group hints (formula)
Heuristic hints from DBE and heteroatoms — not identification.
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Function plotter (polynomial)
Plot y = Σ c_k x^k from coefficients.
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Gas density calculator
ρ = PM/(RT) in g/L from P (atm), M (g/mol), T (K).
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GATE chemistry score (weighted toy)
Weighted sections for rough composite — unofficial.
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Gay-Lussac’s law calculator
P₁/T₁ = P₂/T₂ at constant volume; T in kelvin.
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GC content
GC percentage for DNA.
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Gene expression log₂ fold change
log₂(treatment/control).
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Generation time
Generation time from doubling time and doublings per generation.
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Genetic cross simulator
Monohybrid Punnett outcomes.
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Genetic drift (Wright–Fisher one step)
One generation binomial allele sampling.
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Genotype calculator
Same monohybrid Punnett engine for offspring genotypes.
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g from M and r
g = GM/r² outside a spherically symmetric mass.
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Gibbs free energy calculator (ΔG = ΔH − TΔS)
Gibbs energy change from ΔH (kJ/mol), ΔS (J/mol·K), and temperature in kelvin.
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Graph plotter (2D points)
Connect entered (x,y) pairs.
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Graph plotter (x–y)
Paste x,y pairs; draw a connected line in the browser (SVG).
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Graph theory (degrees)
Edge list → degrees and handshaking check.
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Gravitational force
Newton’s law F = G m₁ m₂ / r² in SI.
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Gravitational potential energy
PE = mgh near Earth.
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Growth rate calculator
Continuous rate r from two population counts and elapsed time.
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Half-life and decay constant
T½ = ln 2 / λ and λ = ln 2 / T½.
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Half-life calculator (0/1/2 order)
t½ for zeroth, first, or second order in a single reactant.
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Hall effect
Hall voltage V_H = B I / (n e t) for one carrier.
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Hardy–Weinberg equilibrium
Allele frequencies and expected genotype frequencies from counts.
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HCF / GCD calculator
Greatest common divisor.
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Heart rate zones
Tanaka max HR estimate and zone range.
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Heat capacity calculator
C = Q/ΔT from measured heat and temperature change (J/K).
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