Lab calculators, built for the bench.
Fast, accurate calculators for solution prep, molecular biology, and analytical chemistry — from dilutions to calibration curves. Free forever, no friction.
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Calculators
Dilution Calculator
C₁V₁ = C₂V₂ and serial dilutions
Solve for any unknown in a simple dilution. Run serial dilutions with a custom factor and see all intermediate concentrations.
- Simple dilution — solve any variable
- Serial dilution table
- Full unit conversion (mM, µM, nM…)
General Calculations
Conversions and bench formulas
Convert temperature, pressure, mass, and volume, plus run Beer-Lambert, RPM/RCF, and Henderson-Hasselbalch calculations.
- Temperature, pressure, mass, and volume
- Beer-Lambert absorbance
- RPM/RCF and buffer ratio calculators
Molecular Weight
Formula parser and molar mass
Calculate molar mass from chemical formulas like NaCl, glucose, CaCl₂·2H₂O, and CuSO₄·5H₂O with element breakdowns.
- Parentheses and hydrate support
- Element mass contribution table
- Send molar mass to reagent prep
PCR Master Mix
PCR, qPCR (TaqMan, SYBR), Q5
Plan PCR or qPCR master mixes with adjustable excess factor, concentration- or fixed-volume components, and pipette accuracy warnings.
- PCR, qPCR (TaqMan, SYBR), Q5 presets
- 10% excess by default
- Pipette-volume sanity check
Stock Solution Planner
C₁V₁ = C₂V₂ working dilutions
Mix a working solution from a stock. Calculates stock volume, diluent volume, and bench-ready instructions with pipette-accuracy warnings.
- Molar and mass-based units
- Pipette-accuracy warnings
- Bench prep sheet
Lab Label Generator
Reagent labels and Pro batch sheets
Create printable labels for reagents, freezer stocks, aliquots, buffers, and media with storage, expiration, lot, and prepared-by fields.
- Free single-label export
- Tube, cryovial, and bottle layouts
- Pro batch label sheets
Calibration Curve
Linear regression and R²
Fit a least-squares line to your standards, read off the equation, R², and standard error, then interpolate an unknown sample concentration from its signal.
- Editable standards table (paste from a sheet)
- Equation, R², and standard error
- Scatter plot with fitted line
LOD / LOQ
Detection and quantitation limits
Calculate the limit of detection and limit of quantitation from a calibration curve (LOD = 3.3σ/S, LOQ = 10σ/S) or from replicate blank measurements, following ICH Q2.
- Calibration-curve or blank-replicate methods
- Residual or intercept σ
- Configurable LOD/LOQ factors
QC Statistics
%RSD, recovery, and outliers
Summarize replicate precision (mean, SD, %RSD, confidence interval), test for an outlier with Grubbs’ test, and check spike recovery and percent error for method QC.
- Mean, SD, %RSD, and confidence interval
- Grubbs' single-outlier test
- Spike recovery and percent error
Reagent Prep
Solutions, buffers, and recipes
Calculate how much solute to weigh for a target concentration and volume. Supports molarity, % w/v, % v/v, and common buffer presets.
- Molarity, % w/v, % v/v modes
- PBS, TAE, TE, TBE buffer presets
- Prep sheet instructions
Popular lab calculation guides
Formula references, worked examples, and common mistakes for the searches scientists actually make at the bench.
Lab calculator hub
Dilutions, solution prep, buffers, and conversions
PCR master mix calculator
Plan PCR/qPCR master mixes with excess factor
Stock solution planner
Working dilution from any stock concentration
Calibration curve calculator
Linear regression, R², and unknown interpolation
LOD / LOQ calculator
Detection and quantitation limits (ICH Q2)
QC statistics calculator
%RSD, recovery, percent error, Grubbs outlier test
Lab label generator
Printable reagent labels and Pro batch sheets
Dilution calculator
C₁V₁ = C₂V₂ with worked examples
Molarity calculator
Calculate mass, concentration, or volume
PBS buffer recipe calculator
1x PBS pH 7.4 recipe with scaling notes
Beer-Lambert calculator
Absorbance, concentration, path length, and epsilon
RPM to RCF calculator
Centrifuge speed conversion by rotor radius
Henderson-Hasselbalch calculator
Buffer ratio, pH, and pKa checks
Molecular weight calculator
Formula parser and molar mass breakdown
TAE buffer recipe
50x TAE stock and 1x working buffer
NaCl molarity calculator
How to make 1 M NaCl and scaled solutions
RIPA buffer recipe
Cell lysis buffer for total protein extraction
Why scientists choose LabTools
Designed for real bench work, not demos.
No friction
Open a calculator and start computing immediately. No account, no ads, no paywalls for core features.
Scientifically precise
Unit-aware calculations across the full range — nM to M, µL to L, mg/mL to % w/v.
Built for the bench
Large touch targets, clear result display, and mobile-first layout for tablet and phone use at the bench.