Science & Weather Calculators
Physics, chemistry and weather calculators for students and pros.
About these calculators
Sixteen physics and chemistry calculators applying standard relationships to concrete inputs: density from mass and volume, molarity for solution prep, ideal-gas-law across unit systems, thermal expansion in four common materials, buoyant force via Archimedes' principle, and engine ratings converted honestly between brake, metric and electrical horsepower.
Each tool names its constants — water density at 4 °C, standard atmospheric pressure, the gas constant in matching units — so results reconcile with laboratory references rather than floating free of provenance. Unit handling is explicit throughout: enter what you have, see what the formula assumes.
Choosing the right calculator
Chemistry class and lab
Molarity handles solution preparation from moles, mass or dilution; molecular-weight sums periodic-table masses; half-life covers radioactive decay and pharmacological clearance alike; flow-rate serves both taps and reaction kinetics.
Physics coursework
Acceleration, kinetic-energy and buoyancy cover mechanics staples; ideal-gas-law links pressure, volume and temperature; thermal-expansion quantifies rails and bridges growing with heat; density bridges matter topics to measurement practice.
Weather and engines
Wind-chill, heat-index and dew-point convert meteorological reports into felt experience and comfort thresholds. Horsepower and engine-horsepower demystify automotive specification sheets, including the losses between crankshaft and road.
Science & Weather calculators we stand behind
Density Calculator
Find density in kg/m³, g/cm³ and lb/ft³ from mass and volume, with specific gravity vs water.
Half-Life Calculator
Solve any half-life problem: remaining or initial amount, elapsed time or half-life itself, plus the decay constant and mean lifetime of exponential decay.
Flow Rate Calculator
Calculate pipe flow rate from diameter and velocity or volume over time, with mass flow from fluid density. Convert L/s, L/min and m³/h.
Also available (13) — work in progress, not yet indexed
These calculators work but are still being checked for accuracy and sourcing, so they are not in search yet. They are free to use.