Many hydraulic pull testers read pressure, while the spec gives the proof load in kN or lbf. Enter the ram's effective area once, then convert either way and print a chart to keep with the tester.
Your tester
Use the effective area from the tester's documentation. Nothing you type is uploaded or saved.
Gauge reading to load
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Proof load to gauge target
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Load chart
Load
Load (other unit)
Gauge reading
Enter the ram effective area to fill the chart.
Ideal load = gauge pressure × ram effective area. Where the tester's calibration certificate gives a pressure-to-load table, that table takes precedence. Calculated with the free tool at calyx-ai.net/qa/gauge-pressure-to-load/ (Quality Tester Solutions LLC).
How the conversion works
Load = gauge pressure × ram effective area. With pressure in pascals and area in square metres the result is in newtons; the tool converts units with exact definitions (1 psi = 1 lbf/in², 1 bar = 100 kPa, 1 lbf = 4.4482216152605 N, 1 in = 25.4 mm). Two quick checks: 1,000 psi on a 1 in² ram is 1,000 lbf, and 100 bar on a 10 cm² ram is 10 kN.
This is the ideal relation. Seal friction and gauge error make a real tester read differently, which is why testers are calibrated. Where the calibration certificate gives a pressure-to-load table, use that table, and use this tool for planning and cross-checks. The tool does not choose loads or limits; those come from your spec.
The Fastener & Anchor Pull-Test Report Templates pack has a 40-row proof-test report with automatic PASS/FAIL, ultimate-load statistics, a calibration log, a unit converter, a printable procedure checklist and a standards index. $49 one-time, from Quality Tester Solutions LLC, the company behind Force-Test pull testers.