General Laboratory Calculators
This category groups support tools that do not belong to a single analytical area. It covers dilution calculations with the C1·V1 = C2·V2 relationship, a scientific calculator for everyday bench math and body mass index. It serves lab technicians, scientists, students and teachers who need quick calculations that are easy to double-check.
Solution prep and bench math
Use these when you need to prepare a dilution, check a volume or work through powers, logarithms or roots. The dilution tool solves for the missing term in C1·V1 = C2·V2; the scientific calculator handles everything else.
Calculate the volume needed to dilute a solution.
Open calculatorPerform basic and scientific calculations.
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Anthropometrics
Use this to calculate BMI from weight and height, a value that often accompanies a test request or the interpretation of other results.
Calculate BMI to assess body weight.
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Choosing the right calculator
Start from the question you need to answer. If you need to know how much stock solution to pipette to reach a target concentration, use the dilution calculator: it solves any of the four terms in C1·V1 = C2·V2 once the other three are known. For serial dilutions, apply the same relationship at each step, treating the previous solution as the new stock.
The scientific calculator covers math that has no dedicated tool, such as powers of ten in unit conversions, logarithms for pH or averaging replicates. BMI is a simple anthropometric index that adds context; it does not measure body composition.
Caveats and limitations
Unit mix-ups are the most common cause of an absurd result. In a dilution, C1 and C2 must share the same concentration unit, and V1 and V2 the same volume unit; mixing mL with µL, or mg/dL with g/L, shifts the answer by orders of magnitude. For BMI, check that height is entered in the unit the field asks for.
The calculators do the math, but they do not validate the procedure. Check the result against your lab's SOP, the accuracy of your glassware or pipette and the reagent manufacturer's instructions. BMI cannot tell lean mass from fat and does not replace a clinical or nutritional assessment.
Frequently asked questions
How do I calculate a dilution with C1·V1 = C2·V2?
Enter three of the four values: starting concentration (C1), starting volume (V1), final concentration (C2) and final volume (V2). The calculator solves for the missing one. Use the same concentration and volume units on both sides of the equation.
Does C1·V1 = C2·V2 work for serial dilutions?
Yes, as long as you apply it step by step. The solution made in one step becomes the starting solution for the next, and the overall dilution factor is the product of the factors at each step.
Does BMI measure body composition?
No. BMI relates weight to height and cannot separate muscle, fat or body water. It is a screening indicator and should be read alongside a clinical assessment.
A support tool for educational purposes; it does not replace clinical assessment.