Back to all toolsComing soon · 2026

Science calculators,
no lab required.

Free physics, chemistry, and engineering calculators — density, speed, molarity, molecular weight, horsepower, weather, and more. All client-side.

No spam. One email when we ship. Unsubscribe any time.

What's coming

15 calculators on the way.

Essential science and engineering formulas in a clean, no-signup interface. Built for students, engineers, and the curious.

Density CalculatorSoon

Calculate density, mass, or volume given any two of the three values.

Mass CalculatorSoon

Convert between mass units — kg, lbs, oz, grams, stones, and more.

Weight CalculatorSoon

Calculate weight from mass and gravitational acceleration on Earth, Moon, or any planet.

Speed CalculatorSoon

Solve for speed, distance, or time given any two values. Supports all units.

Molarity CalculatorSoon

Calculate molarity, moles, or volume of a solution for any chemical.

Molecular Weight CalculatorSoon

Calculate the molecular weight of any chemical formula from atomic masses.

Horsepower CalculatorSoon

Convert between horsepower, kilowatts, and torque. Supports HP, BHP, PS, kW.

Engine Horsepower CalculatorSoon

Estimate engine horsepower from elapsed time (ET) and vehicle weight using the Trap Speed method.

Wind Chill CalculatorSoon

Apparent temperature from air temp and wind speed using the NWS wind chill formula.

Heat Index CalculatorSoon

Feels-like temperature from air temp and relative humidity using the NWS formula.

Dew Point CalculatorSoon

Calculate dew point and relative humidity from temperature and moisture values.

Roman Numeral ConverterSoon

Convert between Arabic numbers and Roman numerals in both directions, any value.

pH CalculatorSoon

Calculate pH, pOH, hydrogen ion concentration, and acid/base strength for any solution.

Half-Life CalculatorSoon

Calculate remaining quantity, decay constant, or time elapsed for any radioactive isotope.

Wavelength / Frequency CalculatorSoon

Convert between wavelength, frequency, and wave speed for light, sound, or any wave.

Need a specific formula?

If you keep reaching for a specific scientific calculation, tell us and we'll build it. Lab and field workflows both welcome.

Suggest a tool

Help us improve

Found a bug, have an idea, or want a new tool? Let us know — every message is read.

While you wait, check out what's live.

60+ free tools for social media — all working, all free, no signup.

Browse social media tools