Bolt count / takeoff

What this calculator does

A takeoff helper: connections times bolts per connection gives the exact count, a waste percentage covers loss and drops, and the suggested order rounds up to the next ten. Counts only — bolt size, grade, washers, DTIs and tension-control assemblies come from your spec, never from here.

Worked example

120 connections × 4 bolts = 480 exact. With 5% waste that is 504, and the suggested order is 510.

Common questions

What waste factor should I use?

5% is the default and an assumption. Tune it to your own loss history: field bolting on a big job with several crews loses more than a shop job with one fitter.

Does it count nuts and washers?

No. One count means one bolt; assemblies (nut, washer, DTI) follow from the spec and the bolt count.

Can I split it by bolt size?

Run it once per size. The tool is deliberately simple — one number in, one number out — so the answer is never hiding a mix.