Everyday Life Calculators

Calculate the exact airflow (CFM or metric) needed to properly ventilate any room. Enter your room dimensions and target ACH rate to size ventilation systems, verify indoor air quality, or troubleshoot stuffiness issues.

Calculate exactly how much fabric you need for sewing, quilting, upholstery, and craft projects. Enter your piece dimensions and get instant cutting layouts with total yardage.

Calculate waist radius and fabric requirements for full, half, 3/4, and quarter circle skirts. Get instant measurements for your sewing project.

Find out exactly what size generator you need. Add your appliances, compare running and surge watts, and get a recommended generator size in kVA with a built-in safety margin.

Convert between amp-hours and watt-hours, calculate C-rate, discharge current, and battery runtime. Works for lithium, lead-acid, LiFePO4, and all battery types.

Calculate exactly how much salt to add to your pool. Enter your pool volume and current salt level to get precise results in pounds or kilograms.

Calculate crosswind and headwind components instantly. Enter your runway number, wind direction, and wind speed to determine if conditions are within your personal limits.

Calculate your real commute costs including fuel, parking, tolls, and vehicle wear and tear. See monthly and yearly totals, plus per-person savings from carpooling.

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

Convert gallons to liters instantly with support for both US and Imperial gallons. Includes conversion tables, formulas, and practical examples for cooking, fuel, and home projects.

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 how much asphalt you need for your paving project. Get instant results for tonnage, volume, and total cost with our free asphalt calculator.

Calculate exactly how much epoxy resin you need for surface coatings and deep pours. Enter your project dimensions and get accurate gallon estimates for countertops, river tables, floors, and resin art.

Calculate exactly how many cubic yards of soil you need for raised beds, gardens, and landscaping projects. Get instant results in cubic yards, cubic feet, and cubic meters.

Calculate the area of any rectangular space and estimate material costs in one step. Enter width and length to get instant square footage and total project costs for flooring, tile, paint, decking, and more.

Free lumber calculator to figure total volume, length, and cost of your wood. Enter dimensions and quantity for instant results.

Calculate exactly how much epoxy resin you need for tables, countertops, river tables, resin art, and floors. Get instant volume results and avoid costly waste or mid-pour shortages.

Calculate exactly how much dirt or soil you need in cubic yards, cubic feet, or bags. Free calculator with weight estimates for landscaping and garden projects.

Calculate exactly how many rolls, slabs, or pallets of sod you need for your lawn project. Enter dimensions for multiple areas, get instant results, plus optional cost estimation.

Compare two materials side by side to find which gives you the best value per foot, meter, or yard. Enter the length and cost for each option and get an instant answer on which is cheaper and how much you'll save.

Calculate the internal volume and liquid weight of any pipe. Enter inner diameter, length, and fluid density to get results in gallons, liters, cubic feet, kilograms, pounds, and more — for water, oil, diesel, glycol, or any liquid.

Calculate exactly how many balusters you need for your deck, porch, or stair railing. Enter your measurements and get an accurate count instantly—no manual math required.

Calculate board feet and estimate lumber costs instantly. Enter dimensions, quantity, and price to know exactly what your lumber will cost before you buy.

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 the exact age difference between two people in years, months, and days. Enter two birth dates and get instant results in multiple formats.

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.