Online construction calculator: the arithmetic worth trusting, and what to ignore
- Work order total
- $863.16
- Labour
- $510
- Parts, marked up
- $288
Every figure on this page is computed from the inputs entered, by the method stated below it. Jobcardo publishes no tax rate, no wage figure and no trade standard: the rate, the markup and the tax on the parts line are yours, and the defaults are a worked example to replace with your own figures.
An online construction calculator is worth using for the arithmetic you do often enough to get wrong: volumes, areas, board and sheet counts, markup and margin, and the tax treatment of materials against labor. It is not worth using for anything that pretends to know your prices. The useful split is simple. A calculator that asks for your figures and shows its working can be quoted from. One that asks for a zip code and returns a number has told you about a region, not about your job.
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Use a construction estimating calculator that shows its working
The value of a construction estimating calculator is that a second person can check it. Inputs visible, formula stated, result derived: that is what makes a number defensible in front of a customer. A black box that emits a price is a liability on the one occasion it is wrong.
Keep margin and markup straight in an online construction cost estimator
Markup is added to cost; margin is a share of the price. A quarter added onto cost and a quarter taken out of the price are two different numbers, and the gap between them is the most common arithmetic error in small construction firms. An online construction cost estimator that labels which one it applies is doing you a service.
Save the inputs, not just the answer, in the construction calculators you keep
The construction calculators most worth keeping are the ones whose inputs end up on the job record. The answer alone ages badly, because in three weeks nobody remembers whether the figure included the disposal. The inputs, dated, are what let the estimate be re-run when the scope moves.
Online construction calculator: common questions
Are online construction calculators accurate enough to quote from? The arithmetic is exact. The accuracy of the quote depends entirely on whether the rates and prices you fed it are yours and current. Use your own last three supplier invoices and your real crew cost, and the answer is quotable.
What is the difference between an estimator and a calculator? A calculator does one piece of arithmetic well. An estimator assembles many of them into a priced job with markup, tax and terms. Most small firms need a handful of the first and one of the second.
Should the calculator handle tax? It should at least let you say which lines are taxable, because materials and labor are often treated differently and getting it wrong on every quote is a slow, consistent loss. Tax on the parts line is a rule you set once and apply to every job.
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