What Does Concrete Grinding Really Cost per Sq Ft?
Diamond tooling, power, and equipment depreciation add up to a direct cost per square foot — before labor, overhead, or margin ever enter the quote.
Direct grinding cost breaks into diamond tooling (cost ÷ lifespan), power (propane burn, or an electric grinder run off a generator), equipment depreciation (purchase price ÷ lifetime hours), and servicing plus dust consumables. Every hourly cost divides by your production rate to land in $/sqft. On the calculator’s own propane defaults, that works out to roughly a dime a square foot — before labor, overhead, or margin.
How to read the inputs
Production Rate
- The one number every other cost divides by to become $/sqft — get this realistic first
Diamond Tooling
- Set cost ÷ how many sqft the set lasts before replacement
Power Source
- Propane burned directly, or electric off an owned or hired generator — each path has its own fuel and depreciation math
Depreciation & Servicing
- Grinder purchase price and routine service cost, each spread across their own hour intervals
Worked example
On the calculator’s own propane defaults — 270 ft²/hr production rate, a $500 diamond set rated for 10,000 ft², 1.0 gal/hr propane burn at $3.50/gal, a $22,000 grinder over a 3,000-hour life, a $500 service every 200 hours, and $200 in dust consumables every 200 hours — diamond tooling comes to $0.050/sqft, propane $0.013/sqft, depreciation $0.0272/sqft, service $0.0093/sqft, and dust consumables $0.0037/sqft, for a direct cost of $0.1031/sqft.
Try it with your own numbers
Pick your power source and enter your real production rate — every other field is pre-filled with a typical value to adjust from.
Full tool breaks the total into a per-line-item cost grid.
Open the live calculator →Common mistakes
- Treating this as your sell price — it’s direct machine cost only, labor, mobilization, dust disposal, overhead, and margin all go on top
- Using a production rate that doesn’t match the actual prep level — hard concrete or heavy stock removal runs slower, which raises every $/sqft line at once
- Not distinguishing owned versus hired generator on the electric path — a hired generator spreads its day rate across a fixed 8-hour day, which understates real cost on a shorter job
- Never revisiting diamond lifespan after a set wears out faster than expected on a harder-than-usual slab
This is the same fixed-cost-per-unit method used to price a work vehicle — see how to calculate your true vehicle cost per job.
Frequently Asked Questions
What’s included in this cost, and what’s not?
Direct machine costs only: diamond tooling, power (propane, or electric with a generator), equipment depreciation, routine servicing, and dust extraction consumables. It does not include labor, mobilization, dust disposal fees, overhead allocation, or your target margin — add those on top to reach the price you actually charge.
Propane or electric — which is cheaper?
It depends on local fuel and propane prices, and whether the generator is owned or hired. The electric path adds the generator’s own fuel, depreciation, and service (if owned) or a day rate spread across an 8-hour hire day (if hired) on top of the base grinding cost. There’s no universal winner — run both power sources with your real numbers before you decide.
Why does the production rate affect almost every line item?
Because every hourly cost — power, depreciation, service, dust — gets converted to a $/sqft rate by dividing by your production rate. A faster machine does not just finish sooner; it spreads those fixed hourly costs across more square feet, lowering the cost per sqft on every line except diamond tooling, which is a straight $-per-sqft lifespan figure rather than an hourly one.
Is diamond tooling really the cheapest line item?
Often, yes, relative to power and depreciation in a typical setup — a metal-bond diamond set amortized over 10,000+ sqft of life works out to just a few cents per sqft. But tooling life varies a lot with concrete hardness and how aggressive the grind is, so keep an eye on actual wear and adjust the lifespan figure if a set is wearing faster than expected.