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  • Property Depreciation Calculator
    Estimate annual real estate depreciation using the US MACRS straight-line method for residential (27.5 yr) and commercial (39 yr) property.
  • Dog Age in Human Years Calculator
    Convert your dog's age into human years using the science-based logarithmic formula (16·ln(age)+31), with a linear puppy approximation under 1 year.
  • Brick Wall Calculator
    Calculate how many bricks you need for a wall. Enter wall dimensions, brick size, mortar joint and waste to estimate total bricks required.
  • Future Value Calculator with Contributions
    Calculate the future value of an investment with an initial principal plus regular monthly, quarterly or annual contributions and compound interest.
  • Shingle Bundle Calculator
    Estimate how many shingle bundles you need for your roof. Enter roof dimensions, planes, waste allowance, and bundles per square to get a quick count.
  • Triangle Area Calculator Without Height
    Find the area of a triangle without knowing its height. Enter the three side lengths and this Heron formula calculator returns the exact area.
  • Air Flow Rate Calculator From Pressure and Diameter
    Calculate air flow rate from pressure difference and pipe diameter. Get volumetric flow in m³/s, m³/h and CFM plus velocity using Bernoulli equation.
  • 3D Line Equation From Two Points Calculator
    Find the parametric and symmetric equation of a line in 3D from two points. Get the direction vector, components, and distance instantly.
  • Pay Raise Over Time Calculator
    Project how your salary grows over time with compounded annual pay raises. See your final salary, total increase, percent gain, and total earnings.
  • Mortar Mix Calculator
    Calculate the cement and sand needed for a mortar mix. Enter wall area, mortar thickness and mix ratio to get bags of cement, sand volume and dry volume.
  • Bitcoin Mining Profit Calculator
    Estimate Bitcoin mining profit per day, month and year from hash rate, power use, electricity cost, BTC price, network difficulty and pool fee.
  • Hourly Pay Raise Calculator
    Calculate your new hourly wage and annual pay after a percentage raise. Enter current pay, raise %, hours and weeks to see your increase.

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