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Calculators for chemistry and biology

Free calculators that show their working, plus reference data for the lab and the classroom.

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Molecular weight
Electron configuration
Molarity
Centrifuge (RCF)
Scientific notation
h-index

118 elements

The periodic table

Atomic mass, electron configuration, oxidation states and isotopes for all 118 elements. Select any element to open its page.

H
He
Li
Be
B
C
N
O
F
Ne
Na
Mg
Al
Si
P
S
Cl
Ar
K
Ca
Sc
Ti
V
Cr
Mn
Fe
Co
Ni
Cu
Zn
Ga
Ge
As
Se
Br
Kr
Rb
Sr
Y
Zr
Nb
Mo
Tc
Ru
Rh
Pd
Ag
Cd
In
Sn
Sb
Te
I
Xe
Cs
Ba
La
Ce
Pr
Nd
Pm
Sm
Eu
Gd
Tb
Dy
Ho
Er
Tm
Yb
Lu
Hf
Ta
W
Re
Os
Ir
Pt
Au
Hg
Tl
Pb
Bi
Po
At
Rn
Fr
Ra
Ac
Th
Pa
U
Np
Pu
Am
Cm
Bk
Cf
Es
Fm
Md
No
Lr
Rf
Db
Sg
Bh
Hs
Mt
Ds
Rg
Cn
Nh
Fl
Mc
Lv
Ts
Og

Reference data

Elements, enzymes, amino acids and codons

118

Elements

Mass, electron configuration and isotopes for every element.

219

Restriction enzymes

Recognition sites, cut positions and the ends they leave.

20

Amino acids

Structures, one- and three-letter codes, and side-chain properties.

64

Genetic code

Every codon and the amino acid it codes for, on one chart.

t½

Isotopes

Half-lives, decay modes and natural abundance for common isotopes.

For researchers

Research metrics

Paste your citation counts and get your h-index, with the working shown. Guides to the i10-index and journal impact factor sit alongside.

Calculate your h-index

For students and teachers

In the classroom

Calculators that show each step, and reference pages written for coursework.

For lab staff

At the bench

Quick answers for prep work: dilutions, spin speeds, cut sites and buffer recipes.