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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 49–96 of 564.
- formula calculator
Atomic radius comparison
Compare tabulated covalent radii (H–Xe subset) for two elements.
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ATP yield (guide)
Textbook glucose ATP ranges.
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Attempt analyzer
Accuracy and guessed negative marking impact.
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Average acceleration
a_avg = Δv / Δt.
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Average (mean)
Arithmetic mean of a list.
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Average velocity
v_avg = Δx / Δt along one axis.
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Bacterial growth curve
Lag, log, stationary, death phases.
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Bacterial growth (exponential)
N = N₀ 2^{t/t_d}.
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Basic calculator
Arithmetic with + − × ÷ ^ and parentheses.
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Battery efficiency calculator
Round-trip or energy efficiency η = 100 × (useful out / energy in) with consistent units.
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Bayes theorem calculator
Posterior P(A|B) from P(B|A), P(A), P(B).
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Bernoulli (horizontal flow)
P + ½ρv² constant along a streamline; solve P₂ or v₂.
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Binary calculator
Integer + − × in base 2.
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Binding energy (mass defect)
ΔE = Δm c² with Δm in kg.
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Binomial distribution calculator
PMF and CDF for Binomial(n,p).
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Binomial expansion (Pascal row)
Coefficients of (a+b)^n for n ≤ 20.
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Biology data analyzer
Mean, SD, min, max from pasted numbers.
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Biology flashcards (how-to)
Guidance for making decks.
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Biology formula sheet
Starter formula list.
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Biology mind map (template)
How to branch concepts.
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Biology revision planner
Study hours from days × hours/day.
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Biology revision tracker
Topics revised vs planned.
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Biology study time planner
Split minutes across items with buffer.
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Biology topic tracker
Percent of units covered.
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Biology units reference
Common length, volume, and mass prefixes.
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Biot–Savart (circular loop, center)
B = μ₀ I / (2R) at the center of a circular loop.
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Bitwise calculator
& | ^ << >> >>> on integers.
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Blackbody radiation
Wien peak wavelength or Stefan–Boltzmann exitance.
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Blood pressure categories
Simplified ACC/AHA-style labels.
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Blood volume estimate
~70 mL/kg adult order of magnitude.
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BMI calculator
Body mass index and coarse category.
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BMR calculator
Mifflin–St Jeor resting estimate.
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Body fat (Navy method)
Circumference estimate.
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Boiling point elevation calculator
ΔT_b from molality, van’t Hoff factor i, and K_b (ebullioscopic constant).
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Bond energy calculator
Estimate ΔH from totals of bond dissociation energies broken minus bonds formed.
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Boolean algebra (2-variable)
Truth table for expressions in A,B with AND OR NOT XOR.
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Box plot (five-number summary)
min, Q1, median, Q3, max.
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Boyle’s law calculator
P₁V₁ = P₂V₂ at constant temperature and amount.
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Buffer capacity calculator
Approximate β ≈ 2.303 [HA][A⁻]/([HA]+[A⁻]) in mol/L per pH unit.
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Buffer solution calculator
pH of a buffer from K_a, [HA], and [A⁻] (Henderson–Hasselbalch).
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Bulk modulus
B ≈ −ΔP / (ΔV/V).
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Buoyant force
F_b = ρ_fluid V_displaced g.
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Calorie intake (TDEE)
BMR × activity factor.
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Calorimetry calculator
Heat from a calorimeter constant and measured ΔT: Q = C_cal · ΔT.
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Capacitance from Q and V
C = |Q|/|V|.
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Carnot efficiency
η = 1 − Tc/Th with temperatures in kelvin.
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Carrying capacity (concept)
What K means in dN/dt = rN(1−N/K).
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Cell cycle phases
Interphase and mitosis outline.
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