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- Debt ratio calculatorDebt ratio = total liabilities ÷ total assets × 100.
- Debt to equity ratio calculatorDebt-to-equity ratio = total debt ÷ total equity.
- Decimal to fraction calculatorConvert a finite decimal into an exact reduced fraction by dividing its integer digits by a power of ten.
- Deck flooring calculatorLay deck boards across a width with a stated gap and count stock lengths along the deck.
- Density calculatorDensity = mass ÷ volume.
- Depreciation calculatorStraight-line depreciation divides cost minus salvage value evenly over useful life.
- Derivative calculatorDifferentiate a polynomial and evaluate its slope at x.
- Dilution calculatorUse C₁V₁ = C₂V₂ to find how much stock solution is needed for a target concentration and final volume.
- Dimensional weight calculatorCompare dimensional weight (length × width × height ÷ divisor) with actual package weight.
- Discount calculatorSee the sale price and how much you save.
- Displacement calculatorDisplacement = initial velocity × time + ½ × acceleration × time².
- Display size calculatorFind rectangular screen dimensions from diagonal and aspect ratio using the Pythagorean theorem.
- Display viewing angle calculatorCalculate the horizontal angle a flat screen fills: angle = 2 atan(width/(2 × distance)).
- Distance calculatorDistance between two planar points = √((x₂ − x₁)² + (y₂ − y₁)²).
- Dot product calculatorThe dot product adds the products of matching vector components.
- Double angle calculatorCalculate sin(2θ), cos(2θ) and tan(2θ) from an angle in degrees.
- Dough hydration calculatorFind baker’s hydration from total water and flour weights.
- Down payment calculatorDown payment = purchase price × down payment percentage ÷ 100.
- Download time calculatorEstimate transfer time = file size in megabits ÷ effective megabits per second.
- Driving range calculatorEstimated range = usable fuel × average fuel economy.
- Drywall calculatorDrywall sheets = wall and ceiling area × (1 + allowance ÷ 100) ÷ sheet area, rounded up.
- Elastic potential energy calculatorElastic energy = ½ × spring constant × displacement².
- Electric vehicle charging cost calculatorCharging cost = energy added × price per kWh ÷ efficiency as a fraction.
- Electric vehicle fuel savings calculatorEnergy-cost saving = distance × (gasoline cost per unit distance − electricity cost per unit distance).
- Electricity cost calculatorEnergy cost = watts × hours per day × days × price per kWh ÷ 1000.
- Ellipse calculatorEllipse area = π × first semiaxis × second semiaxis.
- Emergency fund calculatorTarget reserve = essential monthly expenses × months of coverage. Subtract what you already saved.
- Empirical rule calculatorFind the mean ± one, two and three standard deviations for a proposed normal model.
- Endpoint calculatorThe missing endpoint equals twice the midpoint minus the known endpoint, component by component.
- Engine compression ratio calculatorCalculate static compression ratio = (swept volume + clearance volume) ÷ clearance volume.
- Engine displacement calculatorCalculate engine displacement from circular bore area × stroke × cylinder count.
- Engine horsepower calculatorConvert shaft torque and rotational speed to power: watts = torque × rpm × 2π/60.
- Engine rpm calculatorFind engine rpm = road speed ÷ tire circumference × gearbox ratio × final drive.
- Engine torque calculatorFind shaft torque from power and rotational speed: torque = watts ÷ angular speed.
- Equation of a line calculatorFind the line through two points: slope = (y₂ − y₁)/(x₂ − x₁), then y = mx + b.
- Equilateral triangle calculatorAn equilateral triangle has area √3 × side² ÷ 4 and height √3 × side ÷ 2.
