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.
All tools
Alphabetical list of published utilities Showing 481–528 of 564.
- formula calculator
Simple harmonic motion
ω = √(k/m), T, f, and optional x = A cos(ωt).
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Simple interest calculator
SI = P·r·t with annual percent rate.
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Sleep cycle wake time
Bedtime + n×90 min rough wake clock.
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Slope calculator
Slope through two points.
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Snell’s law
n₁ sin θ₁ = n₂ sin θ₂; solve θ₂, θ₁, n₂, or n₁.
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Solubility from K_sp calculator
Molar solubility s for simple stoichiometries from K_sp (e.g. MA, MA₂).
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Solubility product (K_sp) calculator
K_sp = [M⁺][A⁻] for MA(s) ⇌ M⁺ + A⁻ at saturation.
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Solute potential (Ψ_s)
Ψ_s ≈ −iCRT with stated units caveat.
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Solution preparation calculator
Stock volume to pipette for a target molarity and final volume (dilution).
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Solution preparation (dilution)
C₁V₁ = C₂V₂ for molarity dilutions.
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Sound intensity and level
β = 10 log₁₀(I/I₀) with I₀ = 10⁻¹² W/m².
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Sound intensity level (dB)
β = 10 log₁₀(I/I₀), I₀ = 10⁻¹² W/m².
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Special relativity calculator
γ, contracted length, and dilated time from v and rest values.
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Specific heat (Q = mcΔT)
Heat for a temperature change.
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Spectroscopy hints (IR / ¹H NMR)
Rough region tables — not spectrum simulation.
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Speed converter
m/s, km/h, mph, and other speed units.
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Speed converter
m/s, km/h, mph, knot.
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Speed, distance, time
d = s t rearrangements.
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Speed of sound in air (approx.)
v ≈ 331.3 + 0.606 T_C m/s.
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Sphere calculator
Volume and surface area.
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Spherical mirror formula
Same 1/f = 1/v + 1/u form with Cartesian signs.
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Standard cell potential calculator
E°_cell from two standard reduction potentials E° (cathode − anode).
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Standard deviation calculator
Sample or population SD.
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Statistical analysis
Quartiles and variance.
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Statistics: mean, median, mode
All three from one list.
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Sterilization (D-value guide)
Concepts for thermal sterilization.
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Stoichiometry calculator
Convert mass of reactant A to mass of product or related species B using molar masses and balanced coefficients.
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Strain
ε = ΔL/L₀.
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Stress
σ = F/A.
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Strong acid / strong base calculator
pH for strong monoprotic acid or pOH/pH for strong monobasic hydroxide.
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Sum of series
Σk or Σk² for k = 1…n.
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Surface area calculator
Sphere, cylinder, or rectangular box.
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Surface area / volume (cube)
Cube SA, V, and SA/V.
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Survival rate
Percent survived / initial cohort.
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SUVAT solver
Fill three of u, v, a, s, t; get the rest for constant acceleration.
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Synapse delay sum
Serial synaptic delays toy model.
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System of equations (2×2)
Two linear equations in two unknowns.
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Tangent line calculator
Line tangent to y = f(x) at x = a.
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Taylor series calculator
Taylor polynomial at x = a (numeric or exact polynomial).
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Temperature converter
Kelvin, °C, and °F.
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Temperature converter
°C, °F, K pairs.
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Temperature converter
Kelvin, °C, and °F with exact offsets.
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Tension (Atwood machine)
Ideal string and pulley: a and T from m₁, m₂.
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Theoretical yield calculator
Theoretical mass of product from moles of limiting reactant, coefficients, and product molar mass.
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Thin lens formula
1/f = 1/v + 1/u; solve for f, u, or v (SI meters).
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Time and work calculator
Combined rate 1/T = 1/T₁ + 1/T₂.
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Time converter
s, min, h, d, wk, y.
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Time from u, v, a
t = (v − u) / a when acceleration is non-zero.
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