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 97–144 of 564.
- formula calculator
Cell division (mitosis / meiosis)
Concise phase outline for mitosis vs meiosis.
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Cell potential calculator
E_cell = E_cathode(reduction) − E_anode(reduction) from two half-cell potentials.
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Center of mass (two particles, 1D)
x_cm = (m₁x₁ + m₂x₂)/(m₁ + m₂).
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Centrifugation RCF / RPM
Convert RPM ↔ RCF with rotor radius.
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CFU calculator
CFU/mL = colonies × dilution / volume plated.
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Charge required calculator
Coulombs needed for a target amount: Q = n · n_e · F.
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Charles’s law calculator
V₁/T₁ = V₂/T₂ at constant pressure; T in kelvin.
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Chemical production rate
Production from batch size and batch time (toy rate).
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Chemical storage compatibility
Rough incompatible-pair hints for common lab families.
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Chemistry formula sheet
Copy-friendly list of common formulas by topic.
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Circle calculator
Circumference, area, diameter from r.
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Circuit simulator (lite)
Ideal DC series: current and resistor voltages from V, R₁, R₂.
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Codon table
RNA codon to amino acid listing.
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Collision (1D)
Elastic v₁′, v₂′ or perfectly inelastic common speed.
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Colony count → CFU/mL
Plate count with dilution.
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Combinations (nCr)
Binomial coefficient.
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Combined gas law calculator
P₁V₁/T₁ = P₂V₂/T₂ — solve for any one state variable.
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Complex number calculator
+ − × ÷ and polar data.
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Compound interest calculator
A = P(1+r/n)^{nt}.
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Concentration calculator
Molarity (M), mass concentration (g/L), or mass percent (% w/w) in one tool.
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Concentration converter (mg/mL ↔ mol/L)
mg/mL to g/L and mol/L with MW.
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Conditional probability calculator
P(A|B) from P(A∩B) and P(B).
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Cone calculator
Volume and surface area of a right cone.
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Coordinate geometry (line)
Line through two points + mini plot.
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Coordination number → geometry
Typical geometry name for CN 1–12.
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Correlation calculator (Pearson)
r between two lists.
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Cost estimation (materials)
Raw material cost from unit price and mass.
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Coulomb’s law
Force magnitude between two point charges in SI.
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CRISPR NGG scan (basic)
Find NGG and 20 nt upstream on forward strand.
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Critical angle
sin θ_c = n₂/n₁ when n₁ > n₂.
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Crop yield
Area × yield per hectare.
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Crystal field (octahedral dⁿ)
High vs low spin using Δo/P for d⁴–d⁷; d¹–d³, d⁸–d¹⁰ notes.
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Curve sketching (quadratic)
Vertex, axis, intercepts, concavity.
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Cylinder calculator
Right circular cylinder.
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Daily water intake
33 mL/kg heuristic.
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Dalton’s law calculator
Total pressure from partial pressures or P_i = X_i P_total.
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Data cleaning (numeric)
Extract finite numbers from messy text.
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Data interpretation (basic)
% change and range for a column.
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Dataset summary
Count, min, max, mean, median, SD.
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Data size converter
B, KB, MB, GB, TB (1024).
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De Broglie wavelength
λ = h/p with p = mv.
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Decimal ↔ binary/octal/hex
Convert decimal integers to or from base 2, 8, or 16.
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Decimal to fraction
Approximate decimal as a simple fraction.
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Degree of unsaturation calculator
DBE from a molecular formula (halogens as H).
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Demo double calculator
Example config-driven tool—doubles a numeric input.
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Density
ρ = m/V.
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Derivative calculator
Numeric derivative f′(x) with central difference.
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Diffusion flux magnitude
|J| ≈ D|ΔC|/Δx.
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