// multi-utility computation suite · offline · instant · precise
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eng.leveling-closure-error Calculator
Calculates level loop closure error, allowable closure per FGCS standards, and distributes the error by distance using the Bowditch rule. FGCS first-order levelling allows closure of 4 mm√K where K is loop length in km — second-order allows 8 mm√K.
Inputs
Elevation Start M
Reference formula or conversion factor shown for context.
Sum Bs M
Reference formula or conversion factor shown for context.
Sum Fs M
Reference formula or conversion factor shown for context.
Distance Km
Separation between two points or total path length. Check that units are consistent throughout the calculation.
Results
measured elevation difference (m)
The arithmetic difference between the two values.
calculated end elevation (m)
The value at the specified point or condition.
closure error (m)
The difference between the computed result and the exact or true value — a measure of approximation accuracy.
allowable error (m)
The difference between the computed result and the exact or true value — a measure of approximation accuracy.
acceptable?
Reference formula or conversion factor shown for context.
1st order
Reference formula or conversion factor shown for context.