Calculate measured time-fuse burn rate, required length, or expected burn time with real unit conversions and a minimum-time reference check.

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This federal table applies when safety fuse is individually ignited with handheld lighters; other rules, methods, or jurisdictions may control.

Time Fuse Length Formula

The following formula is used to calculate the Time Fuse Length. 

DL = TL / TT × DT

Variables:

  • DL is the desired Time Fuse Length (in)
  • TL is the test length (inches) 
  • TT is the test time (seconds) 
  • DT is the desired time (seconds) 

to calculate time fuse length, divide the test length by the test time, then multiply by the desired time.

How to Calculate Time Fuse Length?

The following steps outline how to calculate the Time Fuse Length.

  1. First, determine the test length (inches).
  2. Next, determine the test time (seconds). 
  3. Next, determine the desired time (seconds). 
  4. Next, gather the formula from above = DL = TL / TT * DT.
  5. Finally, calculate the Time Fuse Length.
  6. After inserting the variables and calculating the result, check your answer with the calculator above. 

Example Problem:

Use the following variables as an example problem to test your knowledge.

test length (inches) = 36

test time (seconds) = 180

desired time (second) = 270

DL = TL / TT * DT =  ?