Unit_Converter.xlsx

	A	B	C	D	E	F	H
1	Chemical Engineering Unit Converter
2	chemenggcalc.com — NIST-based factors — enter a value, pick From and To units

3
4	QUICK REFERENCE — computed live from the Factors tab (any factor error shows here)
5	1 atm	14.69594878	psi
6	1 bar	14.50377377	psi
7	1 atm	759.9998917	mmHg
8	1 cP	0.001	Pa·s
9	1 gpm (US)	0.227124707	m³/h
10	1 Btu/h.ft2.degF	5.678263341	W/m²·K
11	1 hp	745.6998716	W
12	1 Btu (IT)	1055.055853	J
13
14	CONVERTERS
15	Value	From		To	Result	Notes
16	TEMPERATURE (absolute readings)
17	100	degC	→	K	373.15	Offset scales — NOT multiplicative. For differences use the dT block below.	373.15
18
19	PRESSURE
20	1	atm	→	psi	14.69594878	ABSOLUTE pressure. Gauge = absolute − atmospheric; do not mix.
21
22	DT (TEMPERATURE DIFFERENCE)
23	1	K	→	degR	1.8	For ΔT only: Δ 1 degC = 1 K; Δ 1 degF = 1 degR = 5/9 K.
24
25	MASS
26	1	lb	→	kg	0.45359237
27
28	LENGTH
29	1	ft	→	m	0.3048
30
31	AREA
32	1	ft2	→	m2	0.09290304
33
34	VOLUME
35	1	gal (US)	→	L	3.785411784	US gallon unless marked Imp.
36
37	VOLUMETRIC FLOW
38	1	gpm (US)	→	m3/h	0.227124707
39
40	MASS FLOW
41	1	lb/h	→	kg/h	0.45359237
42
43	MOLAR FLOW
44	1	lbmol/h	→	kmol/h	0.45359237	1 lbmol = 453.59237 mol
45
46	DENSITY
47	1	lb/ft3	→	kg/m3	16.01846337	API gravity excluded (not multiplicative).
48
49	DYNAMIC VISCOSITY
50	1	cP	→	lb/ft.h	2.419088311	1 cP = 1 mPa·s
51
52	KINEMATIC VISCOSITY
53	1	ft2/s	→	m2/s	0.09290304	cSt = mm²/s
54
55	ENERGY
56	1	Btu (IT)	→	J	1055.055853	IT Btu and IT calorie throughout.
57
58	POWER
59	1	hp	→	W	745.6998716	Mechanical (550 ft·lbf/s) horsepower.
60
61	SPECIFIC ENERGY / ENTHALPY
62	1	Btu/lb	→	kJ/kg	2.326	1 Btu/lb = 2.326 kJ/kg exactly (IT).
63
64	SPECIFIC HEAT / ENTROPY
65	1	Btu/lb.degF	→	kJ/kg.K	4.1868	1 Btu/lb·degF = 1 kcal/kg·degC = 4.1868 kJ/kg·K
66
67	HEAT TRANSFER COEFFICIENT
68	1	Btu/h.ft2.degF	→	W/m2.K	5.678263341
69
70	THERMAL CONDUCTIVITY
71	1	Btu/h.ft.degF	→	W/m.K	1.730734666
72
73	MOLAR CONCENTRATION
74	1	mol/L (M)	→	mol/m3	1000
75
76	MASS CONCENTRATION
77	1	ppm (mass, dilute aq.)	→	mg/L	1	ppm↔mg/L assumes DILUTE AQUEOUS solution (ρ≈1 kg/L).
78
79	Notes
80	• All factors live on the Factors tab (one auditable cell per unit), sourced from NIST SP 811 / exact SI definitions; every conversion is value × factor_in ÷ factor_out — no hardcoded pairs.
81	• Temperature readings and temperature DIFFERENCES convert differently: 25 degC = 77 degF as a reading, but a ΔT of 25 degC = 45 degF. Use the correct block.
82	• Pressure conversions are absolute–absolute or gauge–gauge; converting gauge↔absolute requires adding/subtracting local atmospheric pressure.
83	• Energy/heat units use the International Table (IT) definitions: Btu = 1055.05585262 J, cal = 4.1868 J. US gallon is the default gallon; Imperial is labelled.
84	• Unit names avoid special symbols (degC, m3, ft2) so dropdowns work across Excel versions.
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