NFPA in USA

Conversion calculator

Pressure Unit Converter

Convert pressure values between psi, bar, and kPa for fire protection calculations.

Unit ConversionConversionWorkpaper

Calculation workpaper

Enter inputs, review outputs, then use the guidance below before carrying the result forward.

US customary units

Calculation inputs

Enter project screening values in the units shown.

Ready

Worksheet header

Optional project fields for keeping the calculation screen traceable.

Results

Ready

Converted value

6.895

Calculated output

Converted value6.895
From unitpsi
To unitbar

NFPA in USA calculation workpaper

Pressure Unit Converter

Conversion ยท Unit Conversion

nfpainusa.comGenerated record

Project record

Project ID
Not entered
Area
Not entered
System
Not entered
Revision
Not entered
Prepared by
Not entered
Checked by
Not entered

Inputs

Pressure value
100
From unit
psi
To unit
bar

Results

Converted value
6.895
From unit
psi
To unit
bar

Calculation basis

Formula
Unit conversion by pressure factor
Reference standard
Conversion
Professional boundary
Verify adopted code, project criteria, listed equipment data, and AHJ requirements before relying on this record.
NFPA in USAnfpainusa.comThis is a calculation record, not a signed or sealed engineering document.

Calculation basis

Use the formula and linked reference data after the result is visible. Keep input selection separate from the calculation screen.

Formula

Unit conversion by pressure factor

Nominal Pipe Diameter

Nominal SizeSchedule 10 ID (in)Schedule 40 ID (in)
3/4"0.8840.824
1"1.0971.049
1-1/4"1.4421.38
1-1/2"1.6821.61
2"2.1572.067
2-1/2"2.6352.469

Use this result

Use converted pressure only after confirming the source and target pressure units.

Check before use
Confirm the value is pressure and not head, flow, or a gauge reading with missing context.
Common pitfall
Converting pressure units does not account for elevation head or friction loss.
Next step
Calculator library

Input evidence

Confirm these values before using the result.

  • Pressure value
  • From unit
  • To unit

Record retention

Save the PDF after project fields, inputs, and results are set.

PDF includes

  • Project header and calculator inputs
  • Computed result rows and warnings
  • Formula, reference basis, and professional boundary

Check before filing

  • Input traceability
  • Method review
  • Output reasonableness
  • Professional boundary

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Engineering disclaimer
NFPA in USA provides engineering workpapers, calculation checks, and reference tables for project screening and coordination. Final design decisions, code interpretations, submittals, and acceptance records must be completed by qualified professionals and verified against the adopted code, project criteria, listings, and Authority Having Jurisdiction requirements. This site does not issue signed or sealed engineering documents.

Related tools and tables

Calculator librarySprinkler Pipe Internal Diameter Reference

FAQ

What is this Pressure Unit calculator for?+
Use it to compute a defined fire protection value from documented inputs, then retain the inputs, result, formula, and warnings with the project record.
Are the results suitable for permit submission?+
Use the saved record only after it is checked against adopted code, project criteria, equipment listings, and AHJ requirements.