2026-09-23 8 min read

Soil Density Calculator

Free soil density calculator — calculate soil density from a weighed sample with class bands. Includes live results, step-by-step working, charts, material takeoff and cost estimates. No sign-up.

Calculator

Sample weight(lb)

Sample volume(cu ft)

cu ft

Density breakdown

Item	Amount
DensityWeight ÷ volume	110.0 lb/cu ft
Metric× 16.02	1,762 kg/cu m

How to use this result

Primary result: 110.00 lb/cu ft — verify it against a rough hand check before ordering.
Read the steps section to see every conversion and the exact formula path.
Use the breakdown table on the left as your order or bid checklist.
Re-run with worst-case dimensions so the plan covers the whole job.

Results

Normal

Soil density

110.0lb/cu ft

Weight ÷ volume

Metric

1,762kg/cu m

× 16.02

Soil class

Medium

By density band

Live results update as you type — currently showing 110.00 lb/cu ft. Replace the defaults with your own measurements for exact results.

Visualizations

Density vs bands (pcf)

110Yours

75Topsoil

110Common

Sample split

Weight (lb)52%

Volume (cu ft × 100)48%

Formula

Soil density is sample weight over sample volume.

ρ = W ÷ V

Variables

Symbol	Name	Unit	Description
ρ	Density	lb/cu ft	Unit weight.
W	Weight	lb	Sample.
V	Volume	cu ft	Sample.

Explanation

Weight over volume at full precision; bands classify the soil.

Step-by-Step Calculation

Follow each step to understand how the result is calculated from your inputs.

Step 1

Apply ρ = W ÷ V.

110 ÷ 1

Result: ρ = 110.0 lb/cu ft (Medium (common earth))

Final Answer

110.0

Worked Examples

See how the calculator works with different scenarios.

Scenario

The calculation run on the values above, showing the full path rather than only the answer.

Inputs

Result:110.00 lb/cu ft

Calculation

1. Apply ρ = W ÷ V. → ρ = 110.0 lb/cu ft (Medium (common earth))

Result

110.00 lb/cu ft

Interpretation

Probe every pad and trench, separate topsoil from spoil, and book trucks to the loose volume — not the bank figure.

Understanding Your Result

Your Result: Soil density: 110.0 lb/cu ft

Typical range: Pickup ~2 cu yd · dump truck 10–16 loose cu yd · trench 1 ft × 100 ft × 4 ft ≈ 15 bank cu yd.

What This Means

Your result is 110.00 lb/cu ft — the bank and loose volumes, truckloads and cost for your soil

Why It Matters

Earthwork is the first money spent and the easiest to misjudge: swell multiplies spoil, haul distances multiply cost, and rock stops everything. Quantities first keeps the site moving.

Professional Interpretation

Probe every pad and trench, separate topsoil from spoil, and book trucks to the loose volume — not the bank figure.

How this is calculated

Density is sample weight ÷ sample volume. Soil factors apply last; trucks round up.

What drives the result

The inputs in a single consistent unit and the allowance or price you apply.

Recommendations

•Verify critical dimensions on site before ordering.
•Keep one unit throughout each calculation.
•Add the trade allowance before buying, not after.
•Attach the step-by-step working to bids and records.

Educational Content

Introduction

Earthwork quantity is geometry with soil factors: bank volume from dimensions, loose with swell, compacted with shrinkage, trucks from payload.

Concept Explanation

Density is sample weight ÷ sample volume. Soil factors apply last; trucks round up.

Applications

▸Pad, trench and basement takeoffs

▸Cut, fill and balance planning

▸Haul truck scheduling and spoil piles

▸Topsoil, base and bedding quantities

▸Grading and compaction estimates

Benefits

•Bank, loose and compacted figures together
•Swell and compaction factors built in
•Truckloads rounded up for scheduling
•Free, no sign-up, works on site from a phone

Limitations

•Two-dimensional math unless stated otherwise — slopes and curves need the right tool
•Results are only as good as the site measurements
•Allowances and prices are estimates — confirm with local quotes

Best Practices

•Measure twice and write measurements down before typing them in
•Keep one unit throughout each calculation
•Photograph the tape on large or disputed measurements
•Re-run with worst-case numbers so the plan covers the whole job

Common Misconceptions

Myth: The calculator replaces site verification.

Truth: It replaces the arithmetic, not the tape measure — always verify before ordering.

Myth: One decimal place is always enough.

Truth: On long runs, rounding early compounds. Enter full measurements and let the tool round at the end.

Myth: Metric and imperial give different answers.

Truth: They are the same physical quantity in different units — conversion is exact.

Practical Tips

•Enter full measurements and let the tool round at the end.
•Use the steps section to double-check the formula path.
•Save or share the result link with the crew and the supplier.
•Re-run with worst-case dimensions for a safe order.

Common Mistakes

Rounding measurements before calculating.

Enter the full tape reading; rounding early compounds across a job.

Mixing units between fields.

Pick one unit in the dropdown so every conversion is consistent.

Forgetting to verify on site.

Plans differ from as-built work — confirm critical dimensions.

Ordering the bare result with no allowance.

Add the trade waste or contingency factor before buying.

Assumptions

This calculator makes the following assumptions to provide estimates:

Consistent units: All inputs share the selected unit system.

Standard geometry: Flat-plane Euclidean formulas unless stated.

Full precision: Rounding happens only on display, never mid-calculation.

Limitations

Be aware of these limitations when using this calculator:

Estimates, not quotes: Allowances and unit prices vary by region — get 2–3 local quotes.

Verify on site: Confirm critical dimensions before ordering or cutting.

Frequently Asked Questions

Answers to common questions about this calculator.

How do I find soil density?

Weigh a known volume and divide. A cubic foot of common earth runs ~110 lb; topsoil ~75; gravel ~115.

Why does density matter?

It converts takeoffs to tons for hauling, checks compaction tests, and sizes structural loads.

Bank vs loose yards — what is the difference?

Bank yards are in-place; loose yards are after digging, swollen 20–35%. Trucks and spoil piles are loose; pay quantities are usually bank.

How accurate is this calculator?

Exact for the dimensions entered. Probe depths and check soil type — subgrade variation and rock move real quantities.

What does the cost estimate include?

Dig, haul or fill at your unit rates on the computed quantities. Rock, dewatering, shoring and testing price separately.

When do I need shoring or sloping?

OSHA requires protection at 5 ft depth and deeper (4 ft in some states). Plan the system before the excavator arrives.

How do I calculate excavation volume?

Length times width times depth in feet divided by 27 for bank yards, then add swell for loose haul yards. Probe depths — grade is never as flat as the plan.

How much swell should I allow?

25% for common earth, 30–35% for clay, up to 50%+ for blasted rock. Loose yards book the trucks; bank yards pay the contract.

How many dump truck loads is my dig?

Loose yards divided by truck capacity (10–16 typical), always rounded up. The loads row does it at your truck size.

What does digging cost per yard?

Roughly $20–$60 per bank yard for easy machine work, far more for rock, water, tight access or hand work. Enter local rates for a live total.

When do trenches need shoring or sloping?

OSHA requires protection at 5 ft depth and deeper (4 ft in some states): slope, bench, shore or shield. Plan the system before the excavator arrives.

How wide should a utility trench be?

Pipe diameter plus 16–24 in working room, wider with depth for sloping or shoring. Width multiplies every yard and every dollar.

What is bedding stone and how much goes under pipe?

4–6 in of compacted washed stone cradling the pipe, sized as length times width times depth over 27. Bedding carries the pipe forever.

Can I reuse spoil as backfill?

Clean granular spoil, yes — moisture-conditioned and compacted in lifts. Topsoil, organics and debris never go back against structures.

How do I compact backfill properly?

In 8–12 in lifts with a plate compactor or roller at the right moisture. Dumping full height and hoping settles for years.

What surprises hide underground?

Rock, water, old foundations, utilities and soft spots. Call locators, probe or test-pit first — dewatering and rock price far above dirt.

How do I keep excavation quantities honest?

Cross-section at intervals, track every truck ticket, reconcile bank vs loose, and re-measure after changes. Dirt grows when unmeasured.

How do I measure correctly for the soil density calculator?

Measure twice with a tape or laser, write every reading down before typing it in, and keep one unit throughout. Photos of the tape protect you on disputed dimensions.

What units does the soil density calculator use?

Whatever unit you select — pick one and use it for every field so conversions stay consistent. Results convert to the common trade units automatically.

How accurate is the soil density calculator?

Exact for the numbers entered: all math runs at full precision and rounds only for display. Field accuracy depends on your measurements, so verify critical dimensions on site.

Can I use the soil density calculator for bids and quotes?

Yes — the steps section shows the full working, and the breakdown table lists order quantities. Attach both to bids so clients see net figures and allowances separately.

Should I add waste or contingency to the result?

Yes. Add the trade waste factor (5–20% depending on material) before ordering, and carry a separate 5–10% budget contingency for price movement and surprises.

Why is my result different from my supplier quote?

Quotes include delivery, minimums, pack-size rounding, tax and regional pricing on top of bare quantities. Compare the net quantities first, then the add-ons.

Do I need a professional for this work?

Measuring and budgeting you can do yourself with this tool. Structural design, permits, licensed trades and inspections still need qualified professionals.

How do I convert the result to other units?

Use the results dashboard conversions, or the dedicated conversion calculators for length, area, volume and weight. Convert each linear dimension before combining into areas or volumes.

What mistakes do beginners make with the soil density calculator?

Rounding measurements too early, mixing units between fields, ordering the bare result with no allowance, and skipping site verification. The mistakes section on the page covers each one.

Can I share the soil density calculator result with my crew or supplier?

Yes — use the Share result button to send the headline figure and link. The supplier can re-run your numbers from the same inputs.

Does the soil density calculator work on a phone at the job site?

Yes — every page is mobile-friendly with no sign-up. Bookmark the tools you use daily for one-tap takeoffs.

How often should I re-run the soil density calculator?

Re-run whenever dimensions change, prices move, or you switch materials. Early estimates, pre-order checks and final buy quantities each deserve a fresh run.

What should I check before ordering materials?

Dimensions verified on site, correct unit, waste allowance added, pack sizes and minimums confirmed, delivery access and schedule agreed. The breakdown table is your checklist.

Related Calculators

Explore more calculators related to this topic.

Related Guides

Deepen your understanding with these educational resources.

Cut, fill and hauling basics

Bank vs loose yards, swell, and truck planning.

Soil Density Calculator worked examples

Step-by-step soil density calculator examples with real job-site numbers.

Excavation, Earthwork & Grading estimating tables

Reference tables, waste factors and coverage rates for excavation, earthwork & grading.

Glossary

Technical terms used in mortgage calculations explained in plain language.

Bank cubic yard: One cubic yard of undisturbed in-place material.
Loose cubic yard: Excavated material after swell — typically 20–35% more than bank.
Swell: Volume growth when soil is dug (20–35% for most soils, up to 50%+ for rock).
Compaction: Mechanical densification of placed fill, usually in 8–12 in lifts.
Cut / fill: Ground removed (cut) or placed (fill) to reach design grade.
Spoil: Excavated material not reused as fill.
cu yd: The primary unit reported by this calculator.

Authoritative References

Trusted sources and standards referenced by this calculator.

OSHA — Trenching & Excavation Safety U.S. Army Corps of Engineers — Earth Manual ASTM — Soil & Rock Standards EPA — Construction Site Runoff

Applicable Standards

OSHA: sloping, benching or shoring for trenches 5 ft and deeperSwell 20–35% for soils (bank → loose); compaction ~15% (loose → compacted)Haul trucks typically 10–16 cu yd loose per loadCall utility locators before any digging

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Page Information

Last Updated:

2026-09-23

Version:

2.0.0

References:

License:

Free to use for educational and professional purposes.