Fluids converters
Flow - Molar Converter
Convert molar flow rates in mol/s, kmol/h, mmol/min and related units.
Result
3.6 kmol/h
1 mol/s = 3.6 kmol/h
All units for this value
| Unit | Symbol | Value |
|---|---|---|
| Mole per second | mol/s | 1 |
| Mole per minute | mol/min | 60 |
| Mole per hour | mol/h | 3600 |
| Mole per day | mol/day | 86400 |
| Millimole per second | mmol/s | 1000 |
| Millimole per minute | mmol/min | 60000 |
| Millimole per hour | mmol/h | 3600000 |
| Micromole per second | µmol/s | 1000000 |
| Kilomole per second | kmol/s | 0.001 |
| Kilomole per minute | kmol/min | 0.06 |
| Kilomole per hour | kmol/h | 3.6 |
| Kilomole per day | kmol/day | 86.4 |
About this calculator
Molar flow rate measures how many moles of a substance move past a point over time, a quantity used in chemical engineering and reaction-rate calculations. This converter switches between moles, millimoles, micromoles, and kilomoles per second, minute, hour, or day.
How it works in plain English
Molar flow rate is an amount of substance, measured in moles, divided by time, so the converter anchors every unit to moles per second and rescales your entered value through that shared base. Millimoles and micromoles are simply one-thousandth and one-millionth of a mole respectively, while a kilomole is one thousand moles, so each of these prefixes applies a straightforward power-of-ten factor.
The time component works the same way across every mole-based unit: dividing by 60 converts a per-minute figure to a per-second basis, dividing by 3600 converts a per-hour figure, and dividing by 86400 converts a per-day figure. Because the mole and time scalings are independent, a unit like kilomole per hour combines both a factor-of-1000 prefix scaling and a factor-of-3600 time scaling relative to the mole-per-second base.
Select the from and to units, enter your value, and the converted molar flow rate appears immediately, with a table showing that same rate across every supported unit at once. A precision control adjusts the number of decimal places shown, and a swap button reverses the two chosen units instantly.
The formula
- value_in_target = value_in_source × (source factor to mol/s) ÷ (target factor to mol/s)
- 1 kilomole/hour = 1000 ÷ 3600 = 0.277778 mol/s
- 1 millimole/minute = 0.001 ÷ 60 = 1.66667×10⁻⁵ mol/s
- 1 mole/day = 1 ÷ 86400 = 1.15741×10⁻⁵ mol/s
Worked example
Suppose a lab reactor report gives a reagent feed rate of 5 mol/s and a process engineer wants that expressed in kilomoles per hour for a plant-scale summary. Multiplying by the shared-base relationship, 5 mol/s equals 5 × 3600 ÷ 1000 = 18 kmol/h.
Entering 5 into the mole-per-second field with kilomole-per-hour selected as the target shows 18 kmol/h immediately. As an extra check, converting 5 mol/s to a per-day basis gives 5 × 86400 = 432,000 mol/day, confirming that the time-scaling step was applied correctly alongside the kilomole prefix scaling.
The full unit table also reports this same rate as 300 mol/min and 18,000,000 mmol/min, all derived from that single entered figure without further typing. Reading across that table lets the engineer confirm the kilomole-per-hour, mole-per-minute, and millimole-per-minute figures are all consistent representations of the same underlying 5 mol/s feed rate.
Common molar flow rate conversion factors
| Unit | Value in mol/s |
|---|---|
| 1 mole/minute | 0.016667 |
| 1 mole/hour | 0.000277778 |
| 1 millimole/second | 0.001 |
| 1 micromole/second | 0.000001 |
| 1 kilomole/hour | 0.277778 |
| 1 kilomole/day | 0.011574 |
Standard unit definitions
Frequently asked questions
What does molar flow rate describe in a chemical process?
It describes how many moles, a fixed count of molecules or atoms, of a substance pass a given point per unit time, which is useful when tracking reactant or product quantities in a reaction rather than tracking mass or volume. Chemical engineers often prefer molar flow because stoichiometric reaction equations are written in terms of moles.
Why use kilomoles instead of moles for large industrial flows?
A kilomole equals 1000 moles, so expressing a large industrial-scale flow in kilomoles per hour keeps the resulting numbers at a manageable size instead of requiring very large mole-per-second figures. This mirrors how mass flows are often expressed in tonnes rather than grams at industrial scale.
How is molar flow rate related to mass flow rate?
Molar flow rate and mass flow rate for a given substance are related by that substance's molar mass, since mass equals moles multiplied by molar mass. This converter does not perform that substance-specific conversion; it only converts a molar flow rate value between different molar flow units.
Can I convert a micromole-per-second figure from a lab instrument into mole per hour?
Yes. Select micromole-per-second as the from unit and mole-per-hour as the target, then enter the reading from the instrument. The converter applies both the micromole-to-mole scaling and the seconds-to-hours time scaling automatically as one combined calculation.
Does the mole used here refer to a specific substance?
No, a mole is a fixed unit of amount of substance, defined as a specific number of elementary entities, regardless of what that substance is. This converter treats moles purely as a count and does not need to know the identity of the substance being measured.
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