Science
Dew point, lightning, free fall, Ohm's law, wire size, batteries, gears: everyday physics, with the formulas explained.
- Science Battery life calculator Convert a battery's mAh rating into watt-hours, estimate how long it powers a device and how many times a power bank recharges your phone.
- Science DNA concentration calculator Convert a spectrophotometer reading at 260 nm into the concentration of DNA or RNA, the total yield and the A260/A280 and A260/A230 purity ratios.
- Science Density calculator Find the density of an object from its mass and volume, or the mass or volume from the density, with the specific gravity compared with water.
- Science Dew point calculator Enter the air temperature and relative humidity to get the dew point, the absolute humidity and how hot it really feels.
- Science Free fall calculator Find how long an object takes to fall from a given height and how fast it hits the ground, ignoring air resistance.
- Science Gear ratio calculator Enter the teeth of the driving and driven gears to get the gear ratio, the output speed in RPM and the output torque.
- Science Grams to moles calculator Convert grams to moles and moles to grams with the molar mass, and see the number of molecules and the volume the substance would take as a gas.
- Science Hardy-Weinberg calculator Get allele and genotype frequencies from how common a recessive trait is, or from genotype counts, with the share of carriers and a chi-square test.
- Science Ideal gas law calculator Solve the ideal gas law for any one of pressure, volume, amount or temperature, in the units you use, with the mass and density of the gas.
- Science Kinetic energy calculator Enter a mass and a speed to get the kinetic energy in joules, the momentum, and the height of a fall that would release the same energy.
- Science Lightning distance calculator Count the seconds between the flash and the thunder to know how far away the lightning struck, and whether you should take shelter.
- Science Molarity calculator Find the molarity of a solution from the mass of solute and the volume, or the mass to weigh out for a target concentration.
- Science Ohm's law calculator Enter any two of voltage, current, resistance and power to get the other two, with a check against a household circuit.
- Science Percent yield calculator Calculate the theoretical yield of a reaction from the limiting reagent and the balanced equation, then the percent yield from the mass you actually obtained.
- Science Projectile motion calculator Enter the launch speed, angle and height to get how far a projectile travels, how high it goes and how long it stays in the air.
- Science Punnett square calculator Cross two parents for one gene and get the chance of each genotype in their children, plus the odds across several children.
- Science Radioactive decay calculator Work out how much of a radioactive isotope remains after a given time, or date a sample from the share left, with common isotopes built in.
- Science Serial dilution calculator Plan a serial dilution from the transfer and diluent volumes and the number of steps, and get the final concentration and the colonies to expect on a plate.
- Science Series and parallel resistor calculator Enter up to four resistors to get their total resistance connected in series and in parallel.
- Science Water heating calculator Find how much energy, time and money it takes to heat water in a kettle, a pot or an electric water heater.
- Science Wire size calculator Find the wire gauge for a circuit from its current, length and voltage, so that voltage drop stays within the 3% recommended by the NEC.
- Science pH calculator Calculate the pH and pOH of a solution from the hydrogen or hydroxide ion concentration, or from the concentration of a strong or weak acid or base.