All Unit Conversions
Chart Guide

Each chart is a conversion matrix or a two-column lookup:

  • Find your source unit in the left column
  • Read across to the target unit column
  • The cell value is the conversion factor or converted result
  • Multiply a factor by your value, or use the pair lookup as-is

Example: 1 psi = 6.895 kPa (pressure table, row "1 psi", column "kPa")

  • Download a featured PDF for a shop-floor or desk printout
  • Use Ctrl+P (or Cmd+P on Mac) to print any HTML table
  • Select "Landscape" orientation for wider matrices
  • Bookmark this page for the HTML tables and PDF links together

All values sourced from international standards:

  • NIST — National Institute of Standards and Technology
  • BIPM — Bureau International des Poids et Mesures
  • Values shown to 3–6 significant figures
  • Interactive calculators use the same library and still round the display
  • See the About page for sources and IEEE 754 limits

Unit Conversion Charts and Printable PDF Tables

Look up common conversion values in HTML tables, or download printable PDFs for desk and shop-floor use. This hub covers everyday units plus engineering charts for pressure (PSI ↔ kPa), power (hp ↔ kW), speed (mph ↔ kph), and length (mm ↔ inches). Factors follow NIST and BIPM definitions. Currency and live FX rates are not listed here.

How factors are sourced, how the library is updated, and how IEEE 754 rounding is treated are documented on the About page.

Reference packs and worksheets

Print a whole set in one PDF

Packs bind the sheets a trade or class uses into one PDF: electrician, machinist and maker, pipe and plant, HVAC, site engineer, pilot, classroom, engineering and radiation safety. Teachers can add six unit conversion worksheets with answer keys. All free under CC BY 4.0.

Browse the reference packsWorksheets with answer keysEngineering chart pack

Converters for these charts

Each chart has a matching published pair calculator when you need a precise value instead of a lookup table.

Embed a unit converter

Add a free unit-converter widget to a classroom page, docs site, or blog. The snippet is async and small so host pages stay fast, and the Powered by AllUnitConversions credit stays visible.

Get the embed code →

Docs: /embed · iframe source: /widget

Featured printable PDF charts

Crawlable PDF downloads with descriptive names, plus HTML table companions for snippets and offline-free lookup.

Charts by category

HTML chart pages and PDFs grouped by measurement type. Engineering charts stay on this indexable hub.

Machining, piping and construction

Drill and tap sizes, pipe schedules, sheet-metal gauges and rebar, from the published standards.

HTML lookup tables

Snippet-friendly pair tables that sit next to the PDFs. Use them when you need a value without opening a file.

PSI to kPa lookup table

Common tire, compressor, and process pressures. 1 psi = 6.89476 kPa.

PSI to kPa lookup table
psikPa
16.895
534.47
1068.95
14.696101.3
30206.8
50344.7
100689.5
1501,034
PSI to kilopascals converterkPa to PSI converterfull pressure conversion chartpressure conversion chart PDF

Horsepower to kilowatts lookup table

Mechanical horsepower (745.7 W). 1 hp = 0.7457 kW; 1 kW = 1.341 hp.

Horsepower to kilowatts lookup table
hpkW
10.7457
53.728
107.457
2518.64
5037.28
10074.57
150111.9
200149.1
horsepower to kilowatts converterkilowatts to horsepower converterhorsepower to kilowatts charthp to kW conversion chart PDF

mph to kph lookup table

Road-speed values. 1 mph = 1.60934 km/h.

mph to kph lookup table
mphkm/h
58.047
1524.14
2540.23
3048.28
5588.51
6096.56
70112.7
100160.9
mph to kph converterkph to mph converterspeed conversion hubmph to kph conversion chart PDF

Millimeters to inches lookup table

Exact relationship: 1 inch = 25.4 mm.

Millimeters to inches lookup table
mmin
10.03937
50.1969
100.3937
12.70.5
25.41
501.969
1003.937
304.812
millimeters to inches converterinches to millimeters convertermillimeters to inches chartmm to inches conversion chart PDF

Length Conversion Chart

Quick reference for common length and distance conversions.

Length Conversion Chart
Unitmftinkmmicm
1 Meter13.28139.370.0010.000621100
1 Foot0.30481120.0003050.00018930.48
1 Inch0.02540.083310.00002540.00001582.54
1 Kilometer100032813937010.6214100000
1 Mile16095280633601.6091160934
1 Centimeter0.010.03280.39370.000010.000006211
View full converter

Weight & Mass Conversion Chart

Quick reference for common weight and mass conversions.

Weight & Mass Conversion Chart
Unitkglbozgst
1 Kilogram12.20535.2710000.1575
1 Pound0.4536116453.60.0714
1 Ounce0.028350.0625128.350.00446
1 Gram0.0010.0022050.0352710.000157
1 Stone6.351422463501
View full converter

Temperature Conversion Chart

Common temperature values across Celsius, Fahrenheit, and Kelvin.

Temperature Conversion Chart
Description°C°FK
Absolute Zero-273.15-459.670
Freezing Point of Water032273.15
Room Temperature2068293.15
Body Temperature3798.6310.15
Boiling Point of Water100212373.15
Oven (Moderate)180356453.15
Oven (Hot)230446503.15
View full converter

Volume Conversion Chart

Quick reference for common volume and capacity conversions.

Volume Conversion Chart
UnitLgal (US)mLcup (US)fl oz (US)
1 Liter10.264210004.22733.81
1 US Gallon3.7851378516128
1 Milliliter0.0010.00026410.004230.03381
1 US Cup0.23660.0625236.618
1 US Fl Oz0.029570.0078129.570.1251
View full converter

Speed Conversion Chart

Quick reference for common speed and velocity conversions.

Speed Conversion Chart
Unitmphkm/hm/sknots
1 mph11.6090.44700.8684
1 km/h0.621410.27780.5400
1 m/s2.2373.611.944
1 knot1.1511.8520.51441
View full converter

Area Conversion Chart

Quick reference for common area and land measurement conversions.

Area Conversion Chart
Unitm²ft²acrehectare
1 sq meter110.760.0002470.0001
1 sq foot0.092910.00002300.00000929
1 acre40474356010.4047
1 hectare100001076392.4711
View full converter

Pressure Conversion Chart

Quick reference for PSI, kilopascal, bar, and atmosphere conversions.

Pressure Conversion Chart
UnitkPabarpsiatm
1 kPa10.010.14500.009869
1 bar100114.500.9869
1 psi6.8950.0689510.06805
1 atm101.31.01314.701
View full converter

Power Conversion Chart

Quick reference for watts, kilowatts, and mechanical horsepower.

Power Conversion Chart
UnitWkWhp
1 Watt10.0010.001341
1 Kilowatt100011.341
1 Horsepower745.70.74571
View full converter

More conversion tools

Each category page includes detailed tables and interactive calculators. Currency converters are not listed on this hub.

LengthWeight & MassTemperatureAreaVolumeSpeedEnergyPowerForcePressureElectricityMagnetismLightSoundRadiationHeatFluidEngineeringAngleNumbersTypographyData TransferDate-TimeCaseCulinaryFuel ConsumptionPrefixHealth & Fitness

Chart FAQs

Common questions about conversion charts, printable PDFs, and HTML tables.

How do I use these conversion charts?

Find the unit you are converting from in the left column, then read across to the unit you want. The intersection is the factor for one unit. Multiply your value by that factor. For pair tables such as PSI to kPa or hp to kW, read the matching value in the second column.

Where is the pressure conversion chart PDF?

The pressure conversion chart PDF (PSI, kPa, bar, and atmospheres) is linked at the top of this page and also lives on the pressure conversion chart HTML page. It is a crawlable download at /downloads/pressure-conversion-chart.pdf.

Where is the horsepower to kilowatts chart?

Use the horsepower to kilowatts conversion chart PDF, the matching kilowatts to horsepower PDF, or the HTML tables on /hp-to-kw-conversion-chart and this hub. 1 mechanical horsepower equals 0.7457 kW.

Can I print or download these charts?

Yes. Each featured chart has a printable PDF with descriptive download text, plus an HTML table you can print from the browser (Ctrl+P or Cmd+P). PDFs are linked so search engines can crawl them.

How accurate are the values in these tables?

Conversion factors follow published SI and customary definitions (NIST, BIPM, and related standards). Chart values are shown with 3–6 significant digits for readability. Interactive calculators use the same library in IEEE 754 binary64 and still round the on-screen result. See the About page for sources and precision limits.

Do you publish engineering conversion charts?

Yes. The engineering conversion chart covers force, pressure, power, and energy and is a regular indexable reference with HTML tables and a printable PDF. Pressure and power charts are promoted from this hub.

Do you include currency or FX charts?

No. This hub does not list live currency or FX charts. Exchange rates change continuously, so they are not mixed into these indexable unit-conversion tables.

Converters for these charts

Each chart has a matching published pair calculator when you need a precise value instead of a lookup table.

Popular pair converters