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True / Magnetic Heading Calculator
Convert between true and magnetic using entered variation. East variation subtracts; west adds when going true to magnetic.
°
°
If entered value is TRUE → magnetic—
If entered value is MAGNETIC → true—
Variation entered—
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270° with 8° east variation
For an 8° east variation, 270° true converts to 262° magnetic. Starting with 270° magnetic instead gives 278° true.
The two outputs are opposite conversion directions applied to the entered number. Variation is not compass deviation or wind correction.
Formula and method
True and magnetic direction differ by magnetic variation; the sign convention must stay consistent through the conversion.