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Free calculators with formulas and examples

Find a calculator for your task. Search for what you need to do, or choose math, construction, home, car, energy or finance.

Topics

  • Math

    Area, volume, percentages and formulas

  • Construction

    Roofs, measuring and material quantities

  • Home

    Flooring, paint, concrete and insulation

  • Car

    EV charging costs and car finance

  • Energy

    Electricity use, power and batteries

  • Finance

    Interest, savings, stocks and currency

Featured calculators

  • Area

    Find the area of floors, walls, roof surfaces and geometric shapes from their dimensions.

  • Slope and degrees

    Find the slope of a roof, ramp or sloping surface in percent and degrees.

  • Flooring packs

    Find the number of whole flooring packs from the floor area, waste and coverage per pack.

  • Paint

    Calculate liters of paint from the wall area, openings, number of coats and coverage.

  • Electricity consumption

    Calculate kWh and electricity cost from the appliance's power, usage time and your electricity price.

  • Compound interest

    See how an amount develops from the starting capital, annual interest or growth and number of years.