These are working tools, not textbook ornaments — the calculations a performance engineer actually runs during a test, a tariff review or a degradation investigation. Every calculator shows its formula, its assumptions and a worked example beneath the tool, so you can check the method before you trust the number. All calculations run in your browser; nothing you enter is sent anywhere.
Performance Testing
Performance Correction Calculator
Correct measured output and heat rate to reference conditions with influence factors, in the manner of ASME PTC 46 / PTC 22.
Heat Rate & Efficiency Converter
Heat rate in kJ/kWh or BTU/kWh ↔ efficiency, plus the fuel cost of every MWh at your fuel price.
Fuel Flow Calculator
From output and heat rate to fuel flow — kg/s, tonnes/h, Nm³/h, MMSCFD and MMBTU/h — for test-day metering checks.
Gas Heating Value & Wobbe Index
From gas composition to LHV, HHV, specific gravity and Wobbe index, on the ISO 6976 component basis.
Orifice / DP Flow Calculator
Differential-pressure flow on the ISO 5167 basis — verify test instrumentation and plant flow meters.
Performance Degradation Tracker
Baseline test against today's corrected values: output and heat-rate degradation, and what it costs in fuel per day.
Plant Operations
Gas Turbine Ambient Derate
ISO rating to honest site output at ambient temperature and altitude — for dispatch and capacity declarations.
Saturation Temperature & Pressure
Pressure ↔ saturation temperature for water/steam, with latent heat — drums, deaerators, condensers.
Pump & Fan — Affinity Laws & Power
Rescale flow, head and power with speed, and compute shaft power from any duty point.
Three-Phase Motor Calculator
Current to shaft power and torque — and back — with the nameplate cautions that matter in load surveys.
Pipe Flow & Pressure Drop
Velocity, Reynolds number and Darcy–Weisbach pressure drop, fittings included.
Engineering Unit Converter
Pressure, temperature, energy, power and flow — with the gauge/absolute and gallon traps explained.
Mechanical & Maintenance
Bolt Torque & Preload
Tightening torque and clamp load by size, class and friction — the torque–tension relationship, honestly.
Vibration Severity — ISO 20816
Judge an overall reading against the zone boundaries for its machine group, with displacement and acceleration equivalents.
Shaft Alignment — Shim Calculator
Rim-and-face readings into shim packs and lateral moves at the feet, sign convention stated in the open.
Bearing L10 Life
ISO 281 rating life from C/P — plus what that statistic does and does not promise.
Thermal Expansion
Pipe and shaft growth, restrained thermal stress, and centreline growth for hot alignment targets.
Sling Tension
Bridle leg tension by angle, with the two-leg rule for four-leg bridles and danger warnings below 30 degrees.
The set is complete: 19 calculators across performance testing, plant operations, maintenance and solar economics. If a calculation you need is missing, tell me — the practical ones get built.
Solar & Energy Economics
Solar Net Billing Calculator
Net metering vs net billing for residential solar: legacy 1:1 netting, on-grid without battery, and hybrid + LiFePO4 storage side by side — with every assumption adjustable per case.
Deep-Dive Guides
Power Plant Performance Testing: The Complete Guide
PTC 46 and PTC 22 in practice — preparation, corrections, uncertainty, and what a test result really decides.
Power Plant Maintenance: The Complete Guide
The maintenance mix, overhaul rhythm, spares, SAP PM, ISO 55001 and process safety, in one long read.