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.
By subject
Same grouping as your curriculum—e.g. chemistry calculators in one place.
All tools
Alphabetical list of published utilities Showing 241–288 of 564.
- formula calculator
Heat conduction (slab)
Steady power P = kAΔT/d through a flat slab.
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Heat energy calculator (Q = mcΔT)
Heat in joules from mass (g), specific heat J/(g·K), and temperature change.
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Heat engine efficiency
η = 1 − Qc/Qh from heat exchanges.
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Henderson–Hasselbalch calculator
Same buffer relation with pK_a and ratio [A⁻]/[HA] made explicit.
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Hess law calculator
Sum enthalpy steps with multipliers (reverse a step with −1, double it with 2, …).
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Hexadecimal calculator
Integer + − × in base 16.
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Histogram generator
Equal-width bin counts.
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Hybridization from steric number
sp, sp², sp³ from VSEPR steric number 2–4.
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ICE table calculator
Solve x for A ⇌ B + C from K and initial [A]₀ (quadratic ICE).
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Ideal gas law calculator (PV = nRT)
Solve for P, V, n, or T with P in atm, V in L, T in K.
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Ideal gas law (physics)
PV = nRT with P (atm), V (L), T (K).
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Ideal gas moles calculator
Estimate moles from pressure (atm), volume (L), and temperature (K) using PV = nRT.
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Ideal weight (Devine)
Devine formula from height.
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Immune response (outline)
Innate vs adaptive concept summary.
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Impulse
J = F Δt.
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Inclined plane acceleration
a = g(sin θ − μ cos θ) down the slope.
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Induced EMF (motional)
ε = B ℓ v with B, ℓ, v mutually perpendicular.
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Infection spread (early exponential toy)
I = I₀e^{rt} sketch.
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Inheritance patterns (guide)
Autosomal dominant/recessive, X-linked, mitochondrial checklist.
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Integral calculator
Definite integral (Simpson) or polynomial antiderivative.
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Interactive periodic table
Browse Z, symbol, name, and atomic mass.
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Internal energy calculator (ΔU = q + w)
First law for a closed system: internal energy change from heat and work in joules.
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Inverse trig calculator
arcsin, arccos, arctan principal values.
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Investment (future value)
Lump-sum compound growth.
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IUPAC linear alkane names
Parent names for unbranched alkanes C₁–C₂₀.
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JEE physics score (illustrative)
Rough raw score with +4/−1 style inputs — not official.
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JEE rank predictor (toy)
Logistic-style rank estimate from percentile — illustrative only.
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Kinetic energy
KE = ½ m v².
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Kinetic friction
f = μ N for kinetic friction magnitude.
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Kirchhoff (simple circuits)
Series KVL loop or two-branch parallel across an EMF.
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Km from v, Vmax, S
Invert Michaelis–Menten for Km.
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Lab dilution planner
Step dilutions or single-shot dilution from stock to target.
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Lab measurement error
Absolute, relative, and percent error vs an accepted value.
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Lab result z-score (toy)
z from value vs reference mean and SD.
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Laplace transform (reference)
Common transform lines (not a CAS).
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Lattice energy estimator
Kapustinskii-type estimate from charges and ionic radii.
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LCM calculator
Least common multiple of two integers.
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Least count (vernier-style)
LC = (smallest main-scale division) / n vernier divisions.
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Length converter
m, km, cm, ft, in, mi, …
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Limit calculator
Numeric two-sided limit as x approaches a.
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Limiting reagent calculator
Find the limiting reactant for two species using moles and stoichiometric coefficients; shows extent and leftovers.
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Linear equation solver
Solve ax + b = 0.
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Linear inequality (1D summary)
Describe solution on a number line in text.
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Linear inequality solver
Solve ax + b ⋈ c for x.
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Linear magnification
m = −v/u (Cartesian).
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Linear regression (bio experiments)
OLS slope, intercept, R².
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Linear regression calculator
Least-squares line and R².
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Linear thermal expansion
ΔL = α L₀ ΔT.
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