Start with the specified product#
“Crushed stone” describes a broad family of products. “Crusher run” often describes a graded aggregate with fines, but local trade names do not guarantee a particular sieve distribution. Ask for the exact product designation and intended use before comparing two prices.
The Crushed Stone Calculator and Crusher Run Calculator use dimensions and density to estimate purchases. Neither selects the aggregate specification or validates a pavement design.
Compare properties before comparing quantity#
| Question for the supplier or designer | Why it affects the decision |
|---|---|
| What gradation and fines limits apply? | Product names alone do not establish particle distribution. |
| Is this a compacted structural layer or a drainage layer? | The layer must perform the function required by the design. |
| What thickness and lift sequence are specified? | The takeoff needs a defined finished geometry. |
| What density and condition describe the quote? | Loose and compacted volumes cannot share an unexplained factor. |
| What subgrade, separation or drainage details apply? | Quantity alone does not address the complete assembly. |
The Vulcan estimator lists crushed-stone base/crusher run and coarse aggregates separately. That is a useful reminder to identify the actual product; it is not a recommendation for a specific site.
Stability and drainage require different questions#
The Federal Highway Administration's granular-base guidance describes dense-graded base with fines controlled to promote drainage. Its geotechnical pavement guidance separately discusses low-fines base where drainage is the objective. These references explain the distinction; they are not a residential product approval or a substitute for the specification adopted for your project.
| Property | Dense-graded base / crusher-run product | Clean, open-graded crushed stone |
|---|---|---|
| Particle distribution | A range of coarse and fine sizes | A more open particle structure with limited fines |
| Main design question | Can the specified material form the required compacted support layer? | Can the specified material and outlet detail provide the required drainage? |
| Purchasing check | Confirm gradation, finished depth and compatible bulk density | Confirm grading, filter/separation detail, volume and compatible bulk density |
| Common mistake | Assuming every compactable base is a drainage aggregate | Assuming every clean stone is interchangeable with a dense-graded base |
A driveway base and a drainage trench should not be treated as interchangeable applications. Ask the designer or supplier how the proposed gradation, fines and installation detail meet the purpose. An attractive price per ton is irrelevant if the product fails the required specification.
For each quote, record the product name, specification reference, size, intended layer, test information and exclusions. Where local code or public-work specifications apply, obtain the current adopted requirement from the relevant authority. This article does not assign a universal aggregate grade or base thickness.
Transparent comparison using the same geometry#
Suppose a hypothetical base covers 20 ft × 12 ft at 4 in finished depth:
20 × 12 × 4 ÷ 12 = 80 ft³
80 ÷ 27 = 2.96296 yd³
For comparison only, assume product A has 100 lb/ft³ bulk density and product B has 110 lb/ft³, both on the same finished basis. A needs 4.0 short tons; B needs 4.4 short tons before allowances. If each receives a separately chosen 10% allowance, the modeled orders become 4.4 and 4.84 short tons.
These densities are hypothetical, not measured product values. They show why the heavier order is not necessarily the larger volume. The depth is an example dimension, not an installation recommendation.
Compare delivered cost on a common basis#
Ask each supplier to price its own calculated order plus delivery, minimum loads and tax. Check whether an allowance or compaction adjustment is already included. Do not apply a second hidden adjustment when moving from a yard-based quote to a ton-based quote.
If a quote gives density on a loose basis, resolve that against the specified finished geometry before ordering. ASTM C29/C29M describes aggregate bulk-density methods. A calculator input is not evidence that the delivered material was tested under that standard.
Build a reviewable order#
Keep the approved product, geometry, condition-specific density, allowance and supplier increment together. Check payload and access restrictions with the delivery provider. Use the crusher-run density guide for its detailed conversion example, then return to the matching stone or crusher-run tool.
Sources and original hypothetical arithmetic reviewed October 25, 2026. Confirm the exact local product before ordering; no field test, code approval or local supplier validation is claimed.