Standard Time With Allowances Calculator

Work out standard time with allowances instantly with clear inputs, formula shown and shareable results.

About Standard Time With Allowances Calculator

Time study converts an observed time into a standard: normal time is observed time x performance rating, which corrects for the operator working faster or slower than standard pace, and standard time adds allowances for personal needs, fatigue and unavoidable delay. Standard output follows from available minutes divided by standard time.

Formula

Standard time

Normal time = observed time x performance rating; standard time = normal time x (1 + allowance %)

Worked example

With the default values below, Standard Time With Allowances Calculator returns Standard Time of 2.8476. Change any input above and every figure here is recalculated in your browser.

Inputs used

Observed Timeminimum 0.001 minutes: 2.4 minutes
Performance Ratingaccepts 10–200 %: 105 %
Personal, Fatigue And Delay Allowanceaccepts 0–60 %: 13 %
Hours Availableminimum 0.01 hours: 8 hours

Results

Standard Time: 2.8476
Normal Time: 2.5200
Allowance Added: 0.3276
Standard Output: 168.6

Step by step

1Values used
2Standard time
3Standard Time= 2.8476
4Normal Time= 2.5200
5Allowance Added= 0.3276
6Standard Output= 168.6

Assumptions and limits

The result is derived only from the 4 inputs listed above. Anything not among them is not part of the calculation.
In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
Figures are rounded for display to 4 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Frequently Asked Questions

How is performance rating judged?

Against a defined benchmark pace, usually dealing playing cards or walking at 4.8 km/h as 100%. Rating is the most subjective part of time study and needs trained, regularly cross-checked observers.

What allowance is standard?

9-15% for light bench work in good conditions, up to 25-30% for heavy work in heat or awkward postures. Allowances should be derived from a published table, not invented.