Science & Technology
Units and measures are live, with every factor stated and checked backwards — and so are the physics and chemistry calculators: molar mass, dilution, pH, velocity, force, kinetic energy and Ohm's law, each with the working shown. Every topic card in this section is live now.
All science & technology calculators
⚗Molar Mass Calculator
Type a chemical formula. You get its molar mass, element by element, from the standard atomic weights.🧪Dilution Calculator
C1V1 = C2V2. Fill in any three of concentration and volume, leave one empty, and get the fourth.pHpH Calculator
Turn a hydrogen-ion concentration into a pH, or a pH back into a concentration.➤Velocity Calculator
Distance and time in, speed out — with the multiply-back check.FForce Calculator
Newton's second law, F = m × a. Mass and acceleration in, force in newtons out.½mv²Kinetic Energy Calculator
KE = ½mv². Mass and speed in, energy in joules out.ΩOhm's Law Calculator
V = I × R. Fill in any two of voltage, current and resistance; leave one empty and get it.∴Number Base Converter
Binary, octal, decimal and hexadecimal, converted exactly (big-integer arithmetic, no floating-point drift), with the positional working shown.☾Moon Phase Calculator
The moon's phase, age and lit fraction for any date, from the standard 29.53059-day cycle — with the approximation labelled, because it is one.≋Richter Scale Calculator
Compare two magnitudes: how many times more shaking, and how many times more energy. The two answers are very different, and the page shows why.◆Density Calculator
Mass from volume, or volume from mass, for 19 materials with typical densities — water, steel, gold, oak, ice and more. 'Typical' is printed on the page, because alloys and woods vary.
Type a chemical formula. You get its molar mass, element by element, from the standard atomic weights.🧪Dilution Calculator
C1V1 = C2V2. Fill in any three of concentration and volume, leave one empty, and get the fourth.pHpH Calculator
Turn a hydrogen-ion concentration into a pH, or a pH back into a concentration.➤Velocity Calculator
Distance and time in, speed out — with the multiply-back check.FForce Calculator
Newton's second law, F = m × a. Mass and acceleration in, force in newtons out.½mv²Kinetic Energy Calculator
KE = ½mv². Mass and speed in, energy in joules out.ΩOhm's Law Calculator
V = I × R. Fill in any two of voltage, current and resistance; leave one empty and get it.∴Number Base Converter
Binary, octal, decimal and hexadecimal, converted exactly (big-integer arithmetic, no floating-point drift), with the positional working shown.☾Moon Phase Calculator
The moon's phase, age and lit fraction for any date, from the standard 29.53059-day cycle — with the approximation labelled, because it is one.≋Richter Scale Calculator
Compare two magnitudes: how many times more shaking, and how many times more energy. The two answers are very different, and the page shows why.◆Density Calculator
Mass from volume, or volume from mass, for 19 materials with typical densities — water, steel, gold, oak, ice and more. 'Typical' is printed on the page, because alloys and woods vary.