FREE ENGINEERING RESOURCES

Engineering Calculation Tools

Free online calculators and converters for instrumentation engineers. Designed for pressure measurement, signal conditioning, and process control applications. No registration required — use instantly.

Available Tools

Pressure Unit Converter

Convert between 15 pressure units instantly — Pa, kPa, MPa, bar, psi, atm, mmHg, inH2O, and more. Features quick presets for common conversions and click-to-copy results.

Ex i Entity Parameter Validator

Validate intrinsically safe (Ex i) pressure loops in seconds — checks all five IEC 60079-11 inequalities for transmitter, barrier, and cable, with an optional 30% NEPSI commissioning margin and three HMK presets.

4-20mA Signal Calculator

Convert between mA current signals, process values, and percentage of range. Three calculation modes for commissioning, calibration, and troubleshooting 4-20mA transmitter loops.

Hydrostatic Pressure Calculator

Calculate hydrostatic pressure (P = ρgh) for any liquid at any depth. Supports 5 preset fluids plus custom density input, with results in 12 pressure units simultaneously.

RTD Pt100 / Pt1000 Calculator

Convert Pt100 / Pt500 / Pt1000 resistance ↔ temperature using IEC 60751 Callendar–Van Dusen. Shows Class A / Class B tolerance at any temperature.

Thermocouple Calculator

Convert millivolts ↔ temperature for Type K, J, T, N, E, S, R, B thermocouples per IEC 60584-1. Manual / auto CJC and Class 1 / Class 2 tolerance included.

PSI to Bar Converter

Bidirectional PSI ↔ Bar single-pair converter using the exact ISO 80000-4 / NIST SP 811 factor 14.5037738 PSI per bar. Adjustable precision and copy-result.

MPa to PSI Converter

Bidirectional MPa ↔ PSI single-pair converter using the exact ISO 80000-4 / NIST SP 811 factor 145.0377377 PSI per MPa. Adjustable precision and copy-result.