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Online calculators · Page 8
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- Percent error calculatorCompare a measurement with a known reference.
- Percent yield calculatorCalculate percent yield = actual product amount ÷ theoretical product amount × 100.
- Percentage calculatorFind a percentage of a number and add or subtract it.
- Percentage change calculatorFind an increase or decrease from a starting value.
- Percentage difference calculatorCompare two values without choosing a baseline.
- Percentile calculatorFind a percentile in your own list of numbers.
- Perimeter calculatorAdd the side lengths of a closed polygon to find its perimeter.
- Period to frequency calculatorFrequency in hertz = 1 ÷ period in seconds.
- Permutation combination calculatorCount selections with or without order, without replacement.
- pH calculatorCalculate −log₁₀ of hydrogen-ion concentration as an ideal dilute-solution pH estimate.
- Pipe volume calculatorPipe capacity = π × inside diameter² × length ÷ 4.
- Pizza calculatorRound your requested pizza portions up to whole pizzas.
- Plant and flower calculatorCount plant positions on a rectangular grid using your chosen center spacing and edge margins.
- Plywood calculatorCompare two uniform sheet orientations for covering a rectangular surface.
- PoE budget calculatorSum switch-side device power and your reserve, then compare it with a switch’s total PoE budget.
- Poisson distribution calculatorFind event-count probabilities for a Poisson process with your expected count per interval.
- Polygon calculatorRegular polygon area = n × side² ÷ (4 × tan(π/n)). Perimeter = n × side.
- Pool volume calculatorFind volume for a rectangular pool with a floor sloping uniformly from one end to the other.
- Post hole concrete calculatorConcrete around a square post = (π × hole radius² − post width²) × filled depth.
- Power factor calculatorCalculate power factor as real power in watts divided by apparent power in volt-amperes.
- PPM calculatorFind parts per million by mass: ppm = solute mass ÷ total mixture mass × 1,000,000.
- Present value calculatorPresent value = future amount ÷ (1 + discount rate per period)^periods.
- Present value of annuity calculatorOrdinary annuity present value = payment × (1 − (1 + rate)^−payments) ÷ rate.
- Pressure calculatorPressure = normal force ÷ area.
- Price elasticity of demand calculatorCalculate demand elasticity using midpoint percentage changes in quantity and price.
- Price per square foot calculatorPrice per square foot = total price ÷ area in square feet.
- Prime factorization calculatorBreak a whole number into its prime factors.
- Probability calculatorCombine event probabilities using their overlap: P(A or B) = P(A) + P(B) − P(A and B).
- Probability distribution calculatorCalculate mean and variance for a discrete distribution with values and probabilities you supply.
- Production calculatorDivide net available production time by required units to find the required average cycle time.
- Projectile motion calculatorCalculate flight time, range and height for a projectile landing at its launch elevation.
- Projector brightness throw calculatorFind throw distance from image width × throw ratio, and ideal illuminance from lumens ÷ image area.
- Property management cost calculatorManagement cost = collected rent × management percentage + fixed monthly charges.
- Proportion calculatorSolve the missing numerator in two equal ratios.
- Prorated rent calculatorProrated rent = full-period rent × chargeable days ÷ billing-period days.
- Quadratic equation solverFind real or complex roots from three coefficients.
