- Volume Calculator
- Area Calculator
- Perimeter Calculator
- Surface Area Calculator
- Circle Calculator
- Rectangle Calculator
- Triangle Calculator
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Square Inches of a Rectangle CalculatorCalculate the area of a rectangle in square inches by multiplying length × width. Instant results plus a square-feet conversion.
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Laminate/Flooring Boxes for a Rectangular Room CalculatorCalculate how many boxes of laminate or flooring you need for a rectangular room, including a waste allowance for cuts and mistakes.
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BTU for a Rectangular Room CalculatorCalculate the air conditioner BTU needed to cool a rectangular room. Enter length and width in feet to size your AC unit with the 20 BTU/sq ft rule.
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Rectangular Aquarium Volume in Gallons CalculatorCalculate the volume of a rectangular aquarium in US gallons from its length, width, and height in inches. Also shows cubic inches and liters.
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Circular Motion Speed CalculatorConvert RPM and radius into linear (tangential) speed and angular velocity. Uses v = 2πr·(RPM/60) = ωr for any rotating object.
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Wheel Revolutions to Distance CalculatorConvert wheel revolutions into distance travelled. Enter wheel diameter and number of turns to get distance in meters, km, miles, and feet.
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Circle to Sphere Surface Area CalculatorCalculate the surface area of a sphere from its radius using SA = 4πr². Also returns diameter and volume. Fast, free, and accurate geometry tool.
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Circle to Sphere Volume CalculatorCalculate the volume of a sphere from its radius using V = (4/3)πr³. Also returns diameter and surface area instantly with full precision.
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Concrete Driveway Volume CalculatorCalculate concrete volume in cubic yards and feet for a driveway or slab from length, width and thickness, plus 80 lb and 60 lb bag counts.
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Square Feet per Gallon Paint CalculatorFind out how many gallons of paint you need. Enter wall area, coverage per gallon, and coats to get the exact amount of paint to buy.
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Wall Tile CalculatorCalculate how many wall tiles you need for a backsplash or feature wall. Enter wall size, tile size, and waste % to get the exact tile count.
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Excavation Volume CalculatorCalculate excavation volume in cubic yards, cubic feet, and cubic meters from length, width, and depth. Free dig volume estimator for trenches and foundations.
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Gravel Tons CalculatorEstimate how many tons of gravel you need from area and depth. Converts cubic yards to US tons using gravel density. Free, fast project calculator.
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Mosteller Body Surface Area (BSA) CalculatorCalculate body surface area (BSA) in m² using the Mosteller formula from weight (kg) and height (cm). Fast, accurate, and clinically common.
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General Prism Surface Area CalculatorCalculate the total surface area of any prism from its base area, base perimeter, and height using SA = 2·base area + perimeter · height.
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Square Footage CalculatorCalculate square footage from length and width in feet. Get instant area in sq ft, square yards, and square meters for any room or space.
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Body Surface Area (BSA) CalculatorCalculate your Body Surface Area (BSA) in m² using the Mosteller formula from your height (cm) and weight (kg). Fast, accurate clinical tool.
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Hexagon Perimeter CalculatorCalculate the perimeter of a regular hexagon instantly using P = 6s. Enter one side length and get the total perimeter with the formula explained.
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Square Side from Perimeter CalculatorFind the side length of a square from its perimeter using s = P/4. Also returns the square's area and diagonal instantly.
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Arc Length from Radius and Radians CalculatorCalculate arc length from a circle's radius and central angle in radians using s = r × θ. Free, instant, with chord length too.
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Grass Seed CalculatorCalculate how many pounds of grass seed you need based on lawn area (length × width) and seeding rate per 1,000 square feet. Free and instant.
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Roof Shingles CalculatorCalculate how many shingle bundles and roofing squares you need. Enter roof dimensions and waste % to estimate materials for your roofing project.
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Cups to Milliliters ConverterConvert US cups to milliliters (mL) instantly. 1 cup = 236.588 mL. Fast, accurate volume converter for cooking, baking and recipes.
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Gallons to Quarts ConverterConvert gallons to quarts instantly. Enter any gallon amount and get the exact number of quarts using qt = gal × 4. Fast, free, and accurate.
