Everyday Life Calculators

Calculate gear ratios instantly from teeth counts, find output RPM, and understand speed-torque tradeoffs. Free tool for engineers, makers, and hobbyists.

Convert between ppm, percent, per mille, ppb, and ppt instantly. Whether you're testing water quality, interpreting lab results, or checking food labels, this calculator handles the math for you.

Calculate exactly how many cubic yards of concrete, mulch, gravel, or soil you need for any project. Enter your dimensions in any unit and get instant results with cost estimates—so you order the right amount the first time.

Calculate how much siding you need for your project. Enter wall dimensions and openings to get instant estimates in squares and square feet.

Calculate exactly how much gravel or crushed stone you need for paver installations. Get results in cubic yards with compaction factored in—so you order the right amount the first time.

Calculate how much liquid a pipe can hold based on diameter and length. Get instant volume in liters or gallons, plus liquid weight for water, antifreeze, oil, and other fluids.

Figure out exactly how much topsoil you need before heading to the store. Enter your area and depth to get cubic yards, cubic feet, and bag counts—no more guessing, no more second trips.

Convert length and width measurements into acres, square feet, hectares, and more. Get instant results plus perimeter calculations for fencing estimates.

Calculate how much flooring you need and what it'll cost. Enter room dimensions, add waste factor, and get accurate material estimates instantly.

Calculate how long videos will take to watch at different playback speeds. Save time and plan your viewing schedule efficiently.

Calculate days, weeks, months between any two dates instantly. Plan projects, track deadlines, and manage schedules with accurate results.

The average listener saves 200+ hours annually at 1.4x speed. Our visual calculator shows your potential time savings based on your listening habits.