Ha to Wh Converter - Hartree to Watt-hour

Hartree (Ha) to Watt-hour (Wh)

Direct answer

1 Ha = 1.2110402e-21 Wh

Wh = Ha × 1.2110402e-21

Converter

Input

Result

1.2110402e-21Wh

Wh = Ha × 1.2110402e-21

Ha = Wh × 8.2573642e+20

Example: 10 Ha = 10 × 1.2110402e-21 = 1.2110402e-20 Wh.

Express both Ha and Wh in the same base unit J (joule), then cancel the shared base unit.

1
Rewrite Ha in the base unit
$1 Ha = 4.35974472 \times 1 0^{- 18} J$
2
Rewrite Wh in the base unit
$1 Wh = 3, 600 J$
3
Forward conversion
$1 Ha = \frac{4.35974472 \times 1 0 ^{- 18} J}{3 , 600 J} \times 1 Wh = \frac{4.35974472 \times 1 0 ^{- 18}}{3 , 600} Wh = 1.2110402 \times 1 0^{- 21} Wh$
4
Reverse conversion
$1 Wh = \frac{3 , 600 J}{4.35974472 \times 1 0 ^{- 18} J} \times 1 Ha = \frac{3 , 600}{4.35974472 \times 1 0 ^{- 18}} Ha = 8.2573642 \times 1 0^{20} Ha$

A guarded explanation for this pair page covering definition, principle, assumptions, and cautions.

Guarded output

AI text is for interpretation only. The page calculator remains the source of truth for numeric results.

1 Ha = 1.2110402e-21 Wh.

10 Ha = 1.2110402e-20 Wh.

100 Ha = 1.2110402e-19 Wh.

Use Wh = Ha × 1.2110402e-21.

1 Wh = 8.2573642e+20 Ha.

Use the conversion factor and round the result to the precision required by your calculation.