Area Calculator

  • Mosteller Body Surface Area (BSA) Calculator
    Calculate body surface area (BSA) in m² using the Mosteller formula from weight (kg) and height (cm). Fast, accurate, and clinically common.
  • Roof Shingles Calculator
    Calculate how many shingle bundles and roofing squares you need. Enter roof dimensions and waste % to estimate materials for your roofing project.
  • Grass Seed Calculator
    Calculate 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.
  • Rectangle Square Meters to Square Feet Calculator
    Convert a rectangle's area from square meters to square feet. Enter length and width in meters to get the total area in ft² instantly.
  • Guntha to Square Feet Calculator
    Convert Guntha to square feet instantly. 1 Guntha = 1,089 ft². A traditional Indian land-area unit used in Maharashtra, Karnataka & beyond.
  • Kanal to Square Feet Calculator
    Convert Kanal to square feet (ft²) instantly. 1 Kanal = 5,445 sq ft, the standard land unit used in Pakistan and northern India. Also shows yd² and m².
  • Countertop Square Footage Calculator
    Calculate countertop square footage by adding up each section's length × width. Includes waste overage, square meters, and total square inches.
  • Hemisphere Surface Area Calculator
    Calculate the total surface area of a hemisphere (3πr²) plus its curved and flat-base areas from the radius. Fast, accurate, and free.
  • Furniture Paint Coverage Calculator
    Calculate how many liters of chalk or furniture paint you need based on surface area, number of coats, and paint coverage per liter.
  • Vinyl / HTV Material Calculator
    Calculate how much vinyl or heat transfer vinyl (HTV) you need for your cuts. Enter design size, quantity, roll width and waste to get length in inches and feet.
  • Acrylic Paint Coverage Calculator
    Estimate how much area your acrylic paint covers from mL and coverage per mL. Adjusts for multiple coats. Great for paint-by-numbers and craft projects.
  • Square Feet to Square Yards for a Rectangle Calculator
    Convert a rectangle's dimensions in feet to square yards instantly. Enter length and width in feet to get the area in square yards (1 sq yd = 9 sq ft).
  • Rectangular Field / Plot Area Calculator
    Calculate the area of a rectangular field or plot of land from its length and width in meters, feet, or yards. Get results in m², hectares, and acres.
  • Paint Area Calculator with Door & Window Deductions
    Calculate the true paintable wall area by subtracting door and window openings from the gross wall area. Free, metric, and easy to use.
  • Paint Calculator with Multiple Coats
    Calculate how much paint you need for a wall with multiple coats. Enter width, height, coats, and coverage to get gallons or liters required.
  • Area of an Ellipse Calculator
    Calculate the area of an ellipse instantly using A = π·a·b. Enter the semi-major and semi-minor axes to get area plus an approximate perimeter.
  • Area of an Octagon Calculator
    Calculate the area of a regular octagon from its side length using A = 2(1+√2)·s². Instant results with perimeter and worked example.
  • Area of a Semicircle Calculator
    Calculate the area of a semicircle from its radius using A = ½πr². Also shows diameter and perimeter. Fast, free, and accurate semicircle area tool.
  • Area of a Sector Calculator
    Calculate the area of a circular sector from radius and central angle in degrees or radians. Also gives arc length. Free, instant, with formula and examples.
  • Area of a Pentagon Calculator
    Calculate the area of a regular pentagon from its side length. Get area, perimeter and apothem instantly with the exact geometric formula.
  • Rectangle Square Feet to Square Meters Calculator
    Convert a rectangle's dimensions in feet to area in square meters. Enter length and width to get instant ft² and m² results with the 0.092903 factor.
  • Trapezoid Calculator
    Solve any trapezoid for sides, angles, height, perimeter, midsegment and area. Supports scalene, isosceles and right trapezoids with many input combos.
  • Rhombus Calculator
    Free rhombus calculator. Enter any 2 known values (side, diagonals, angles, height, perimeter or area) and instantly solve for all remaining rhombus properties.
  • Parallelogram Calculator
    Free parallelogram calculator: solve sides, angles, diagonals, height, perimeter and area from any known combination. Pick a mode, enter values, get all properties.

Categories