CommissioningBeginner
Percent of Design
Compare a measured value with its scheduled or design value and evaluate the result against a user-entered tolerance.
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Commissioning Engineering
Commissioning, retro-commissioning, functional performance testing, field verification, BAS trending, acceptance screening, and building-performance calculations.
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Available calculation tools
65 reviewed tools are available in this collection.
CommissioningIntermediate
Fan Performance Verification
Compare measured fan airflow, pressure, and speed with scheduled values and an affinity-law speed prediction.
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Pump Performance Verification
Compare measured pump flow, head, and speed with scheduled values and an affinity-law speed prediction.
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Coil Capacity Verification
Calculate airside sensible coil capacity and compare it with an approved design value.
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Chiller Capacity Verification
Calculate chilled-water capacity, percent of scheduled capacity, and operating kW per ton or COP-equivalent ratio.
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Boiler Efficiency Verification
Estimate boiler thermal efficiency from fuel input and measured water-side output.
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Cooling-Tower Performance
Calculate tower range, approach, effectiveness, and deviation from an entered design approach.
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Outdoor-Air Percentage
Estimate outdoor-air fraction from outdoor, return, and mixed-air temperature measurements.
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Electrical Phase Imbalance
Calculate line-voltage unbalance using maximum deviation from the three-reading average.
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Transformer Loading
Calculate measured apparent power and percent transformer loading from voltage, current, and phase configuration.
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Generator Load Test
Calculate generator real- and apparent-power loading, power factor, and test energy.
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Sensor Calibration
Calculate sensor error, percent-of-span error, and corrected indicated value from a reference comparison.
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Instrument Uncertainty
Combine accuracy, resolution, and an additional independent uncertainty component by root-sum-square.
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TAB Flow Reconciliation
Reconcile entered airflow streams and calculate the imbalance between inflow and outflow totals.
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Trend Runtime and Cycling
Calculate runtime percentage, runtime hours, and starts per hour from evenly sampled trend data.
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Percent Difference
Calculate symmetric percent difference between two non-reference measurements.
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Linear Interpolation
Interpolate a dependent value between two known points using a straight-line relationship.
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Data Averaging
Calculate the arithmetic mean, minimum, maximum, and range for five entered readings.
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Standard Deviation
Calculate sample or population standard deviation for five entered readings.
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Energy Cost
Estimate energy use and consumption cost from power, operating hours, load factor, and an entered energy rate.
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Simple Payback
Calculate simple payback from net initial cost and annual net savings.
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Analog Signal Scaling
Linearly scale a measured analog signal into an engineering process value.
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Alarm Response Time
Calculate alarm annunciation and operator/system response delays relative to an entered requirement.
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Operating-Cost Comparison
Compare baseline and proposed electricity cost from input power, annual hours, and energy rate.
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Equipment Runtime Cost
Calculate electrical energy and cost from equipment input power, runtime, and energy rate.
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Acceptance Band
Convert a target and user-entered percent tolerance into lower and upper arithmetic endpoints.
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Multi-Point Tolerance
Calculate three signed deviations, worst deviation, and count within a visible user-entered tolerance.
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Sensor-Pair Agreement
Calculate signed, absolute, and relative difference between two synchronized readings.
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Sensor Drift Rate
Calculate signed change and average drift rate between two documented readings.
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Instrument Hysteresis
Calculate upscale/downscale indication difference and percent of entered instrument span.
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Square-Root Extraction
Convert differential-pressure signal percent to ideal flow percent and flow using the square-law relationship.
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Test Uncertainty Ratio
Calculate the ratio of an entered allowable tolerance magnitude to an entered expanded uncertainty magnitude.
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Median of Five
Sort five entered observations and report the middle value, minimum, and maximum.
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Weighted Average
Calculate a weighted average from three values and three nonnegative user-entered weights.
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Coefficient of Variation
Calculate mean, sample standard deviation, and sample coefficient of variation for four values.
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Root Mean Square
Calculate RMS magnitude and arithmetic mean for four user-entered values.
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Root Sum Square
Combine four orthogonal or independent magnitude components by root-sum-square arithmetic.
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Percent Change
Calculate signed absolute and percent change relative to the magnitude of a nonzero initial value.
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Rate of Change
Calculate signed change per minute between two documented values.
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Three-Point Trend
Calculate the least-squares slope for three equally spaced values and the fitted middle value.
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Trapezoidal Total
Integrate three equally spaced rate samples by the trapezoidal rule.
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Duty Cycle
Calculate on-time percentage and off time over a documented observation interval.
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Cycle Rate
Calculate cycles per hour and mean minutes per cycle from count and observation duration.
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Response Latency
Calculate clock-corrected latency from command and response timestamps and a signed offset correction.
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Completion Forecast
Forecast remaining time from completed items, total items, and elapsed time at the observed average production rate.
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Invert from Slope
Calculate downstream invert from upstream invert, signed slope ratio, and horizontal run.
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Elevation Transfer
Transfer elevation from a benchmark using backsight and foresight readings.
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Equipment Pad Volume
Calculate rectangular equipment-pad concrete volume from plan dimensions and thickness.
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Concrete Quantity
Calculate net rectangular volume for repeated elements and add a visible waste allowance.
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Base Grout Volume
Calculate net rectangular grout volume under a base using a visible void fraction.
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Pipe Insulation Area
Calculate circular outer surface area over developed length with a visible fitting allowance.
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Round-Duct Sheet Area
Calculate round-duct lateral sheet area over developed length with a visible fitting allowance.
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Rectangular Duct Area
Calculate four-side rectangular-duct sheet area with a visible allowance.
Open calculatorCommissioningIntermediate
Transition Corner Slant
Calculate maximum corner slant for a centered rectangular transition.
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Pipe Offset Travel
Calculate ideal centerline travel and setback for a single-plane offset and fitting angle.
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Rolling Offset Travel
Calculate true offset, ideal travel, and setback from two perpendicular offsets and fitting angle.
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Pipe Cut Length
Subtract two fitting takeouts from center-to-center length and add a visible signed cut allowance.
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Wire-Pull Length
Add horizontal and vertical route, visible slack percentage, and two termination allowances.
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Conduit Fill
Calculate cable-area fill and compare it only with a visible user-entered criterion; no code table is embedded.
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Tray Width Utilization
Calculate single-layer cable-width utilization from user-entered cable widths and usable tray width.
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Hanger Count
Calculate arithmetic support count from effective run length, maximum spacing, and equal end offsets.
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Support Spacing
Calculate equal interval spacing from supported length and a whole-number support count.
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Weighted Completion
Calculate overall completion from three work-package percentages and visible weights.
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Punch-List Age
Calculate count-weighted average age for three punch-list age groups.
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Curve Interpolation
Evaluate the quadratic passing through three distinct user-entered curve points by Lagrange interpolation.
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Technical resources in development
The platform will add field guides, articles, videos, standards notes, templates, and professional workflow resources alongside the Free calculator library.
Explore the resource roadmap- Functional performance verification
- Air and water system testing
- BAS controls and trending
- Equipment performance screening
- Energy and operational diagnostics