Home & DIY Calculators Free Online Tools

Amps Calculator

Convert between amps, watts, and volts using the electrical power formula I = P / V.

Calculate board feet for lumber based on thickness, width, length, and quantity.

Calculate BTU requirements for heating or cooling a room based on dimensions, insulation, climate, and sun exposure.

Calculate cubic yards and bags of concrete needed for slabs, columns, and stairs.

Calculate decking boards, joists, posts, and beams needed for a deck based on dimensions and board specifications.

Calculate the number of drywall sheets, joint tape, and compound needed for walls and ceilings.

Calculate how much an appliance or device costs to run per day, month, and year.

Calculate the number of posts, panels, and rails needed for a fence based on total length and spacing.

Calculate the square footage of flooring needed, including waste allowance and number of boxes.

Calculate insulation thickness and material quantities based on desired R-value and insulation type.

Calculate board feet, actual dimensions, and total lumber needed for common nominal sizes.

Calculate cubic yards and bags of mulch, gravel, or soil needed for a landscaping area.

Calculate how many gallons of paint you need based on wall dimensions, coats, and openings.

Calculate roof area, roofing squares, and shingle bundles needed based on dimensions, pitch, and waste allowance.

Calculate the square footage of a room by shape: rectangle, L-shape, or circular.

Estimate how many solar panels are needed to offset your electricity usage based on location and panel specifications.

Calculate the number of risers, riser height, total run, and stringer length for a staircase, with IRC compliance checks.

Calculate the number of tiles and boxes needed for a floor or wall area, with grout and waste.

Calculate voltage drop, voltage at load, and percent drop for copper or aluminum wire runs.

Calculate the number of wallpaper rolls needed based on wall dimensions, roll size, and pattern repeat.

Convert between watts, amps, and volts using the power formula P = V x I.