PlantCalcKit Online
Our paid Excel tools, in your browser. Enter your data free and check it; unlock the full results, findings and printable sheet when you need them.
3 runs
USD 9 once
- Each run unlocks one tool for 2 hours; change inputs as often as you like.
- Use the 3 runs within 30 days of buying.
Monthly
USD 15 a month
- All 40 online tools, unlimited, while you subscribe — and new tools as they are added.
- Renews monthly; cancel any time from your receipt email.
Yearly
USD 99 a year
- The same access as monthly for a full year (12 months of the monthly plan is USD 180).
- Renews yearly; cancel any time from your receipt email.
Free: enter your data and see the input checks and status for any tool. Paid: unlocking shows the results, findings and the printable sheet.
Separate licences: online access and Excel downloads are bought separately — one does not include the other. See the Excel workbooks (from USD 19). How it works and questions
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Try fewer words or an abbreviation such as LMTD, NPSH or HRSG, or clear the filters. Not online yet? Every free calculator is on the calculators page.
Cooling towers
Cooling Tower Performance Test
Tower capability from a field test by the performance-curve method, with cell-by-cell results and screening diagnostics.
Cooling Tower Water Balance
Evaporation, drift, blowdown, makeup and water cost for open recirculating towers — three cases side by side.
Cooling Water Chemistry and Cycles
Scaling and corrosion indices, safe cycles, acid feed and the full cost of your treatment programme.
Cooling Tower Thermal Rating and Upgrade
Predict cold water for any weather, flow, load or fan condition — and compare fill, fan and extra-cell upgrades with payback.
Heat exchangers
Shell and Tube Heat Exchanger Performance and Fouling
Actual U, fouling resistance and cleanliness from plant readings — with the duty lost to fouling, its yearly cost and the best cleaning interval.
Condenser and Reboiler Performance
Process condensers, steam surface condensers and reboilers, rated zone by zone — with the back-pressure and lost output a dirty condenser costs.
Gas Cooler and Compressor Intercooler
Wet-gas coolers and intercoolers: dew point, condensate load, sensible and latent duty, U and fouling — and the extra compressor power a warm intercooler costs.
Heat Duty and Utility Consumption
Heat duty for up to 10 process streams, the steam, cooling water, refrigeration or fuel each one needs, and the yearly utility bill.
Waste Heat Recovery
How much heat a hot gas or flue gas can give back — as steam or to heat another stream — with fuel saved, CO₂ avoided and payback.
Plate Heat Exchanger Performance
Plate exchanger performance from a test, and the clean duty and pressure drop predicted from the plate geometry.
Pumps
Pump Head, Power and Efficiency
Head, efficiency and power curves for any impeller diameter and speed from the vendor's curves, the motor size with API 610 margins, low-flow alerts and a field test against the curve.
Pump NPSH and Cavitation
NPSH available for four cases side by side — tank or suction-gauge route, altitude, hot liquid, low level — against the vendor NPSH3 curve with margins, suction specific speed and vortex submergence.
Pump System Curve and Operating Point
System curve from one known point or from the pipe, the operating point for 1–4 pumps in parallel or series, and throttle vs VFD vs impeller trim to a target flow, with the yearly energy cost.
Reciprocating and Metering Pumps
Capacity, slip and brake power for simplex to nonuplex pumps, flow pulsation from the crank motion, acceleration head and NPSH with or without a suction dampener, and metering stroke settings.
Pump Troubleshooting Guide
Pick the pump kind and the symptom, answer simple yes/no questions and add any readings — get the likely causes ranked, with what to check, what to do and the source.
Piping and flow measurement
Pipe Sizing and Pressure Drop
Pressure drop or allowable flow for liquid, gas and steam lines, with fittings, elevation, choked-flow and flashing checks and a size table over every NPS of your schedule.
Orifice Plate Sizing
Orifice bore for a flow and transmitter range, the flow from a measured differential, or the differential for a flow, by ISO 5167-2 — with β, C, ε, permanent loss, limit checks and straight lengths.
Physical properties
Fluid Properties Calculator
Properties of about 165 process fluids at any temperature and pressure — water and steam, refrigerants, solvents, glycol and brine solutions, heat transfer oils and petroleum fractions.
Gas Properties Calculator
543 chemicals in one alphabetical list, or a mixture of up to 12: Z, density, cp with pressure correction, viscosity, conductivity, heating values and hazard data at any T and P.
Liquid Properties Calculator
543 chemicals in one alphabetical list, or a liquid mixture: density, cp, viscosity, conductivity, surface tension, vapour pressure, latent heat, heating values and hazard data at any T and P.
Tanks and vessels
Vessel Volume and Level
Volume, mass and level for horizontal and vertical vessels with any common head — plus transmitter %, alarm volumes, fill and drain time and a strapping table.
Utilities and energy cost
Utilities Cost Calculator
The cost of every utility your plant makes — raw to demin water, steam at up to six pressures, power from every source, cooling water, air and nitrogen — solved together, with a monthly-data tab.
Utilities and plant efficiency
Chiller Performance and COP
Capacity, COP, kW/TR and EER of a water-cooled chiller: IPLV-style part-load efficiency, Carnot fraction, approaches and UA for fouling, and design, actual and proposed cases with a condenser water what-if.
Compressed Air Demand and Leakage
Leak flow from a load/unload test or hole sizes, annual energy and cost of leaks, artificial demand from excess pressure, pressure-reduction saving, receiver sizing and a pipe pressure drop check.
Air Compressor Specific Power and Efficiency
Air compressor free air delivery corrected to ISO 1217 conditions, specific power in kW per m3/min and kW per 100 cfm, isothermal, adiabatic and volumetric efficiency, load / unload vs modulation vs variable speed, annual cost, heat recovery and the value of a lower discharge pressure.
Fan and Blower Performance
Fan and blower efficiency from airflow, pressure and motor power: density correction, fan laws, motor loading, and the yearly energy and cost of damper, inlet vane and variable speed control.
Thermal Insulation Thickness and Heat Loss
Thermal insulation for pipes, flat surfaces and vessels: bare versus insulated heat loss, surface temperature for touch protection or dew point, economic thickness and payback, with temperature-dependent conductivity.
Boiler Efficiency and Fuel Consumption
Steam boiler efficiency by the direct and indirect methods for gas, oil and coal: excess air from flue gas O2, every heat loss, fuel consumption, and the yearly fuel and cost saved by trimming excess air or stack temperature.
Condensate Recovery and Flash Steam
Flash fraction from pressure let-down, flash steam and residual condensate, flash vessel and vent condenser sizing basis, and the yearly value and payback of a condensate return project.
Steam Trap Sizing and Steam Loss
Size a steam trap for a drip leg, process heater or known load, estimate the steam, fuel and cost lost by a trap that fails open, and see the payback of repairing the traps in your survey.
Turbines and compressors
Combined Cycle Plant Performance
Net output, net efficiency and heat rate of a gas turbine, HRSG and steam turbine plant: design, actual and proposed cases, ISO correction, loss breakdown and ambient what-if.
Compressor Intercooling and Staging
Stage a compressor: the number of stages from your discharge-temperature limit, equal-ratio stage table, intercooler duty and cooling water, UA, and the power intercooling saves, with real-gas properties for pure gases and mixtures.
Centrifugal Compressor Performance
Real-gas polytropic head and efficiency from plant readings, an energy-balance check on your measurements, and the yearly energy cost of running away from the best operating point.
HRSG Thermal Performance
Heat recovery steam generator performance behind a gas turbine, with or without duct firing: steam at one or two pressure levels, stack temperature, heat balance, pinch and approach checks and the value of lost steam.
Steam Turbine Performance
Isentropic efficiency, steam rate, heat rate and exhaust wetness of a condensing or back-pressure steam turbine from plant readings, with the yearly cost of the efficiency shortfall.
Gas Turbine Performance
Heat rate, efficiency, exhaust flow and temperature of a simple-cycle gas turbine from plant readings, corrected to ISO conditions, with the yearly cost of degradation and an inlet air cooling what-if.
Reciprocating Compressor Performance
Single- or multi-stage (up to four stages) reciprocating compressor performance from the cylinder data: volumetric efficiency, capacity, power, discharge temperature, rod gas load and a comparison with plant readings.
Steam Condenser Performance
Terminal temperature difference, overall U and cleanliness factor of a surface condenser, the back-pressure you should be getting, and the turbine power and money lost to the excess.
Steam Turbine Extraction and Backpressure Evaluation
A steam turbine with up to two extraction points, expanded section by section, compared with a PRV letdown and a condensing last section for the same header steam.
Steam Turbine and Compressor Train Performance
A steam-turbine-driven compressor train as one system: shaft power the turbine can deliver against what one or two compressor casings need, the margin, and the speed that balances the train.
Pricing in detail
3 runs — USD 9
For a one-off job: an acceptance test, a troubleshooting check, a design review. Each run unlocks one tool for 2 hours — change the inputs as often as you like in that time. Use the 3 runs within 30 days.
Monthly — USD 15
Unlimited use of all 40 PlantCalcKit online tools while you subscribe, and every new tool as it is added. Cancel any time from your receipt email.
Yearly — USD 99
The same as monthly for a full year — about half the price of paying month by month. For engineers who use the tools every week.
How it works
- Enter your data. The online tool is the same sheet as the Excel workbook — same inputs, same units, same checks. The status line tells you if anything is missing or outside the normal range. This part is free.
- Buy a pack or subscribe. Checkout is by Lemon Squeezy. Your licence key arrives on the order page and by email.
- Paste the key and unlock. You see every result, the findings and the full sheet, ready to print or save as PDF.
Questions
Are the results the same as the Excel tool? Yes. The online tool runs the workbook's own formulas, checked cell by cell against the Excel file.
What happens to my data? Your inputs are sent to our server only to do the calculation, and are not stored. Your browser remembers your last inputs on your own device so you can come back to them; the Reset button clears them.
Which is better for me — online or Excel? If you run the calculation every month, or need to keep and archive the file, buy the Excel tool. If you need an answer once or twice, use the online pack.
Is there a refund? If an online run did not work (for example the server was down or the result was wrong), email us within 14 days of purchase with your order number and we will add the run back or refund you. Read the full refund policy.