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A hand-picked starting set of 24 calculators. Browse all 515 science calculators through the topic hubs above, or use search.
Convert earthquake magnitude to energy release and TNT equivalent. Learn how seismic energy scales with magnitude and why these numbers matter for hazard assessment.
Use this earthquake magnitude calculator to estimate local (Richter) magnitude from wave amplitude and distance to the epicenter, with clear formulas, exampl...
Interactive rocket equation calculator with mass burn, velocity, and energy tracking on a responsive canvas.
Determine the gravitational acceleration on any planet or moon using its mass and radius. Explore how surface gravity shapes planetary environments.
Compute the buffering capacity of a weak acid/conjugate base system using the Henderson-Hasselbalch relation.
Estimate the pH of a buffer from acid and conjugate base concentrations using the Henderson–Hasselbalch equation. Ideal for biochemistry, molecular biology...
Translate DNA or RNA codons into an amino-acid sequence with the standard genetic code. Paste a sequence, choose a reading frame, and compare how frame shifts change protein output.
Design aquaponics systems with optimal fish tank, biofilter, and plant grow bed sizing. Calculate fish stocking density, plant yield, nutrient cycling, and system economics for tilapia, trout, and other species.
Estimate low-redshift galaxy distance from redshift using Hubble's Law and an adjustable Hubble constant.
Estimate the mass and radius of noninteracting or self-interacting boson stars from particle mass and scattering length inputs.
Compute the characteristic polynomial of a 2x2, 3x3, or 4x4 matrix and see how it relates to eigenvalues, trace, and determinant.
Compute eigenvalues and eigenvectors of a 3×3 matrix step by step. This 3×3 eigenvalue calculator uses the characteristic polynomial and Cardano’s method to...
Calculate circle chord length, arc length, and segment area from a radius and central angle in degrees. Includes MathML formulas, a worked geometry example, interpretation notes, and an interactive arc mini-game.
Measure a sphere's volume and surface area from its radius with this calculator. See the formulas, a worked example, and the main assumptions behind the result.
Use this beta distribution calculator to compute the PDF, CDF, mean, variance, and mode for Beta(a, b). Enter positive shape parameters a and b and a point x in [0, 1] to evaluate proportions, rates, and Bayesian priors.
Estimate extinction probabilities and generation growth for Galton–Watson branching processes with configurable offspring distributions.
Estimate household electrical demand, compare it with your service size, and review conservative breaker and panel upgrade guidance for common residential loads.
Calculate the minimum speaker wire gauge (AWG) for a given one-way run length, amplifier power, and speaker impedance to keep power loss under your chosen percentage.
Estimate recoverable energy (kWh) and cost savings from regenerative braking using vehicle mass, speed change, regen efficiency, braking events per day, and electricity price.
Estimate energy stored in a sand heat battery, charging time, and heating duration for off-grid thermal storage experiments.
Estimate HVAC cooling capacity in BTU/hr and tons for a room, house, or office using square footage, climate, insulation, sun exposure, and internal heat gains. Compare sizing assumptions and review practical limits.
Calculate nominal bolt shear strength Vn and design shear strength φVn from bolt diameter, ultimate tensile strength, number of shear planes, and whether threads are in the shear plane. Includes formulas, assumptions, a worked example, practical design notes, and an optional bolt-alignment mini-game.
Estimate nominal and design shear strength of a reinforced concrete beam (ACI-style Vc+Vs) in SI units (mm, MPa), including φVn.
Compute friction head loss and pressure drop in a pipe using the Darcy-Weisbach equation with the Swamee-Jain friction factor.
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