Tools
16 browser-based engineering calculators for PLC, DCS, and plant-floor work. No signup; 15 work without JavaScript and 1 computes locally in your browser. Submit an example to see its result; the resulting URL includes the input values and can be bookmarked. Formulas, worked examples and assumptions are on each page.
Use non-sensitive inputs: server calculators place values in the URL. Calculation methods · CSV worksheets
Production & quality
OEE calculator
Availability × performance × quality from your shift numbers, with the six big losses mapped to each factor.
Takt time calculator
Calculate demand pace from net production time, compare it with observed cycle time, and see the required hourly rate.
Production capacity calculator
Estimate theoretical output and expected good units from cycle time, parallel lanes, availability and yield.
Cp, Cpk, Pp & Ppk calculator
Calculate two-sided capability or performance indices from specification limits, mean and an explicitly selected variation estimate.
Sample mean & standard deviation calculator
Summarize 2–500 measurements with mean, sample standard deviation, minimum, maximum and range.
Maintenance & business cases
MTBF, MTTR & availability calculator
Calculate operating hours between failures, average repair time, and repair-based availability from one consistent event window.
Downtime cost calculator
Estimate contribution at risk from a production stop, with separate restart, scrap and overtime costs.
Automation ROI & payback calculator
Build a simple undiscounted business case with installed investment, realizable annual benefit, recurring cost and a chosen horizon.
Energy & drives
Engineering unit converter
Pressure, temperature, flow, level, and length conversions in the units actually used on the plant floor.
Industrial energy cost calculator
Estimate annual kWh, energy charges and assumed savings from electrical power, operating schedule and tariff.
Motor running current calculator
Estimate single-phase or balanced three-phase AC running current from shaft kW, voltage, efficiency and power factor.
Compressed air leak cost calculator
Estimate the annual energy equivalent of a leak from free-air flow, measured specific power, pressurized hours and tariff.
Signals & networks
4–20 mA loop scaling
Convert between 4–20 mA, percent of span, and engineering units — both directions, with a loop check table.
Modbus RTU CRC & frame helper
Compute Modbus RTU CRC-16, append it to a frame, and convert between register numbers and protocol addresses.
Modbus register decoder & byte-order check
Decode two Modbus registers as float32, int32 and uint32 in all four byte orders (ABCD, CDAB, BADC, DCBA), test each against known readings, and print the comparison card.
Subnet calculator
IPv4 network, broadcast, host range, and mask conversions for OT cells and machine networks.