Laboratory Unit Converter
A focused unit converter for laboratory work: mass (g, mg, µg, ng), volume (L, mL, µL, nL), concentration (M, mM, µM, nM, mg/mL, µg/mL, %, ×), time (s, min, h, day), and temperature (°C, °K, °F). The calculator preserves full precision and is designed to be the calculator you trust when converting bench numbers.
Calculator
Enter a value and convert to see the result
Converted value
value → SI base unit → target unit
Every family converts through one canonical base unit (gram, litre, mol/L, mole, metre, second, or Celsius), so chained conversions never accumulate rounding error. Temperature is the one affine conversion and is handled by its own formulas.
About this calculation
What this is
A unit converter is a tiny calculator that multiplies a quantity by the right scaling factor between two units of the same dimension. The bench-friendly versions include only the prefixes and units used in laboratory work — no obscure historical units, no mixed-system conversions.
Why it is used
Every protocol you read uses a different mix of units. Converting reliably is the difference between a buffer at 50 mM and one at 50 µM — three orders of magnitude. A trustworthy converter with a small, well-defined set of units is faster than a generic engine.
Why this calculator exists
The prefixes in the SI system are powers of 10, so a bug in the conversion factor (10⁶ instead of 10³) is silent. A calculator with a fixed, audited unit list and full-precision arithmetic removes that risk.
Key assumptions
- You pick two units of the same dimension; the calculator rejects cross-dimension conversions.
- Concentration conversions assume the solute identity is the same — mg/mL and M are not interchangeable without molar mass.
- Temperature conversions are linearised exactly; they are reversible without precision loss.
Limitations
- It does not handle non-SI historical units (furlongs, cubits) — it is a laboratory tool, not a kitchen one.
- It does not convert between different dimensions (mass ↔ volume) because that requires density.
- It does not normalise spellings — type "uL" and "µL" are not the same token to the parser.
What this calculates
- Converted value
- The same quantity expressed in the target unit.
Frequently asked questions
How do I use the laboratory unit converter?
Pick a unit family (mass, volume, concentration, and so on), enter the value, then choose the unit you are converting from and the unit you want. The converter returns the same quantity expressed in the target unit. The family choice determines which units appear in the from and to selectors.
Which laboratory units does the converter support?
Nine families cover common bench needs: mass (pg to kg), volume (nL to L), mass/volume concentration (pg/mL to g/L), molar concentration (pM to M), amount of substance (pmol to mol), length (nm to m), time (ms to h), temperature (C, K, F), and cell concentration (cells/mL, cells/µL and the x10^6 variants). Only these listed units are supported — there is no arbitrary composite-unit algebra.
Can I convert ng/mL to µM with this tool?
Not directly. Mass-per-volume (ng/mL) and molar concentration (µM) are different unit families, and the converter only rescales within one family because bridging them requires the molecular weight of your specific solute. Use the Molarity Calculator for that step: it combines molecular weight with mass and volume to move between mass and molar units.
Why was my conversion rejected?
The most common reason is mixing units from different families — for example pairing mL with mg — which the converter refuses because the two quantities describe different physical dimensions. Negative values are also rejected outside the temperature family, since a negative mass or volume is not physically meaningful.
How accurate are the conversions?
Every conversion in a family routes through a single base unit (such as the gram or litre), so results never accumulate the rounding error that chained step-by-step conversions produce. The displayed result is rounded to 4 significant figures, so keep the full-precision input values for downstream calculations where that matters. Temperature is the exception to simple scaling: it uses exact affine conversions between C, K, and F.
For research and educational use only. Not for clinical or diagnostic decisions. Always verify calculations independently before use in critical applications.