Landscaping Construction

Paver Base Calculator — Full ICPI Base Stack: Geotextile Fabric, Compacted Crushed Base, 1-in Bedding Sand and Polymeric Joint Sand

Q: How deep should paver base be?

Per ICPI Tech Spec 2: foot patio 4–6 in compacted ; walkway 4–6 in; light vehicle 6–8 in; full driveway 8–12 in. Always compacted depth, not loose — you order ~25% more loose material to land the compacted depth.

Q: How thick should bedding sand be under pavers?

Exactly 1 in (max 1.5 in) per ICPI. Never thicker — thicker bedding sand migrates laterally under load and the pavers rut within 12–18 months. If the base is wavy enough that 1 in of sand can’t cover the high spots, the right fix is to re-screed and re-compact the base, not bump the sand thickness.

Q: Do I need geotextile fabric under paver base?

For driveways and any subgrade with >12% clay content: yes, always . For foot patios on firm sandy soil: optional but recommended ($0.30/ft² fabric saves $5–$8/ft² in eventual base replacement). Use non-woven 4-oz for foot traffic, woven 6-oz for vehicular.

Q: How many tons of paver base do I need?

For a 100 ft² patio at 4-in compacted depth: 1.4 tons of crushed base (loose, to order) + 0.4 tons of bedding sand . Total 1.8 tons for the base layers. The 1.4 tons is loose-tons-to-order; it compacts to ~1.1 tons in place.

Q: Can I use polymeric sand on existing pavers?

Yes — blow out the existing joint sand (leaf blower + stiff broom; clean to at least 1.25 in depth), sweep in polymeric sand filling joints flush, compact lightly with a plate compactor (with rubber mat) or by foot, mist with water per manufacturer’s instructions (typically 2–3 light passes, not a flood). Best on a dry forecast — 24 hr no rain.

Q: How much polymeric sand do I need for a paver patio?

At standard 1/8–3/16 in joints with 1.5 in joint depth: 1 bag (55 lb) per ~90 ft² . A 14×14 patio = 196 ft² = 3 bags . Wide rustic 1/4 in joints: 1 bag per 65 ft². Flagstone 1/2 in joints: 1 bag per 40 ft².

Estimate every layer of an ICPI-compliant paver base stack: geotextile fabric with 10% overlap, compacted crushed base (loose tons to order with 1.25 compaction factor), exactly 1 in bedding sand (never thicker — it ruts), and polymeric joint sand — with depth presets for foot patios, walkways, and driveways.

Edited by Sarah Miller, Construction Content Editor

Technically reviewed by Ryan Mitchell, Landscape Material Planning Specialist (12 yrs)

Published 2026-05-17 · Updated 2026-05-17 · Technically reviewed 2026-05-17

Paver Base Calculator

Enter project dimensions below — results update instantly. Switch units freely.

Try a real example:

Patio Area 0 ft²

Crushed Base (loose tons to order) 0 tons

Crushed Base Volume (loose) 0 yd³

Bedding Sand 0 tons

Geotextile Fabric (10% overlap) 0 ft²

Polymeric Joint Sand 0 bags

Total Base-Stack Material Cost $0

Estimates assume typical industry density and waste factors. Always verify with your supplier and local building code before purchasing material.

Why this matters

Why Most Paver Failures Are Base Failures — and What ICPI Says Your Base Stack Should Be

The Interlocking Concrete Pavement Institute (ICPI) publishes Tech Spec 2 for residential pavers. Three numbers from it are non-negotiable, and most failed-paver jobs I’ve evaluated violate at least one:

Compacted crushed-base depth. Foot traffic 4–6 in; light vehicle 6–8 in; driveway 8–12 in. Compacted, not loose — you order ~25% more loose to land that compacted depth.
Bedding sand layer = exactly 1 in (max 1.5 in). Never thicker. Thicker bedding sand ruts and migrates under load, and the entire paver field develops low spots within 12 months.
Joint sand = polymeric, not regular play sand. Polymeric sand bonds the joints, sheds water, and resists weed/ant infiltration. Regular sand washes out within 2–3 rain events.

Three additional places paver base estimates go wrong:

Skipping geotextile fabric. On any subgrade with >12% clay, ICPI recommends a non-woven fabric ($0.20–$0.35/ft²) to prevent fines migration up into the base. Within 5–10 years, an unfabricked patio on clay loses 20–40% of its base depth to subgrade contamination.
Using loose-density math for the crushed base. Standard gravel calculator at 100 lb/ft³ under-orders dense-graded base by 20–25%. DGA / 3/4 in minus needs the 1.25 compaction factor and 110 lb/ft³ loose density — same math as the Crusher Run Calculator.
Forgetting polymeric joint sand. A 14×14 ft patio with 1/8-in joints uses ~2 bags of poly sand ($64) — people skip it to save the money and end up with a weed-filled, bug-ridden patio in two years.

The calculator above estimates the entire stack: geotextile + loose tons of crushed base + 1 in bedding sand + polymeric joint sand — and outputs the total material cost.

The formula

How to Calculate Paver Base Calculator

Crushed Base ft³_loose = A_ft² × (D_compacted ÷ 12) × 1.25
Crushed Base tons = (ft³_loose × 110) ÷ 2000
Bedding Sand tons = (A_ft² × (1÷12) × 100) ÷ 2000
Fabric ft² = A_ft² × 1.10 (10% overlap)
Poly Sand bags = ⌈A_ft² ÷ 90⌉ (55-lb bag at 1/8–3/16 in joints)

1.25 is the loose-to-compacted factor for DGA (same as crusher run); 110 lb/ft³ is loose density of dense-graded base; 100 lb/ft³ is bedding sand (washed concrete sand or ASTM C33 fine aggregate). Poly sand coverage 80–100 ft²/bag depending on joint width.

Compacted Base Depth by Application (ICPI Tech Spec 2)

Paver Base Depth & Bedding by Use Case (ICPI Residential)
Application	Compacted base	Bedding sand	Geotextile	Subgrade prep
Foot patio (chairs / table)	4 in	1 in	If clay (>12% P200)	Strip topsoil; compact subgrade 95% Proctor
Foot patio (heavy use, deck alt)	4–6 in	1 in	Always recommended	Same + 1 in over-dig for fabric
Walkway (heavy garden cart)	4–6 in	1 in	If clay	Same as foot patio
Light vehicle (driveway parking pad)	6–8 in	1 in	Always recommended (woven 6-oz)	Strip + compact + 6-oz woven fabric
Full driveway (daily cars)	8–12 in	1 in	Required (woven 6-oz)	Full excavation 12–18 in; 95% Proctor subgrade
Heavy commercial (trucks)	10–14 in (two 5–7 in lifts)	1–1.25 in	Required (woven 8-oz)	Engineered subgrade per ICPI Tech Spec 4

Source: ICPI Tech Spec 2 (Residential), Tech Spec 4 (Vehicular). Bedding sand must be 1 in (max 1.5 in) regardless of application — the urge to bump it to 2 in for ‘easier leveling’ is the single biggest preventable cause of paver rutting.

Why Bedding Sand is Exactly 1 Inch (and Never Thicker)

The bedding sand layer’s job is to set the pavers, not to level the subgrade. Leveling is the compacted base’s job. ICPI’s 1-in (max 1.5 in) bedding standard exists because sand thicker than 1.5 in loses its angularity-lock under load and migrates laterally, creating ruts that show up at the paver surface within 12–18 months. If you find yourself wanting 2–3 in of bedding sand to fix a wavy base, the right move is to lift the pavers, screed the base flat to grade, re-compact, and lay 1 in of fresh sand.

Polymeric vs Regular Sand for Joints

Polymeric sand is silica sand pre-mixed with a polymer binder. After installation, you mist it with water; the polymer activates and locks the sand into a rigid, weed-resistant joint that still allows water to drain through. 2026 retail $28–$38 per 55-lb bag; one bag covers 80–100 ft² at typical 1/8–3/16 in joint widths.

Regular play sand or mason sand washes out within 2–3 heavy rain events, allows weed seeds to germinate in the joints, and provides zero structural locking between pavers. The $32 savings per bag is the single worst trade in residential hardscape — the patio looks weedy in 18 months and rocks like a loose tile in 3 years.

For the paver count itself (not the base under them), use the Paver Calculator. For the dense-graded crushed base alone, the Crusher Run Calculator uses the same 1.25 compaction math. For the bedding sand alone, the Sand Calculator handles ASTM C33 concrete sand.

Field note from Ryan Mitchell, Landscape Material Planning Specialist (12 yrs)

On a 18×14 ft (252 ft²) paver patio in Lewes DE (July 2024), the homeowner’s contractor had spread 3 in of bedding sand instead of 1 in — ‘to make the pavers easier to level over the rough base.’ The patio looked perfect for the first summer. By March of the next year there were 6 visible depressions and 2 raised humps; you could feel the pavers move under foot. I diagnosed it from the surface deflection — that’s a textbook over-thick bedding sand failure. We pulled every paver, removed the 3 in of sand, screeded the existing 6-in DGA base flat to grade (it was actually solid — the 95% Proctor compaction had been done correctly), laid 1 in of fresh ASTM C33 concrete sand, re-set the pavers, and re-locked with polymeric sand. Total re-do labor: $1,850. The original installer’s shortcut to save 30 minutes of base-screeding cost the homeowner that much. Every paver base estimate I do now leads with the ICPI 1-in bedding standard and the depth-by-application table above — before tonnage, before cost, before pretty paver patterns. Get the stack right and the patio lasts 25–40 years.

Paver Base Coverage Table and Material Reference

Paver Base Stack Cost — Quick Reference (2026 Mid-Atlantic, full ICPI stack)
Patio size	Application	Crushed base	Bedding sand	Fabric + poly sand	Total stack
10×10 (100 ft²)	Foot, 4 in	1.4 tons / $49	0.4 t / $18	$33 + $64 (2 bags)	$164
14×14 (196 ft²)	Foot, 4 in	2.7 tons / $95	0.8 t / $36	$65 + $96 (3 bags)	$292
20×20 (400 ft²)	Foot, 6 in	8.3 tons / $290	1.7 t / $77	$132 + $160 (5 bags)	$659
12×40 (480 ft²)	Walkway, 6 in	9.9 tons / $347	2.0 t / $90	$158 + $192 (6 bags)	$787
10×20 (200 ft²)	Parking pad, 8 in	5.5 tons / $193	0.8 t / $38	$66 + $96 (3 bags)	$393
12×40 (480 ft²)	Driveway, 10 in	16.5 t / $578	2.0 t / $90	$192 + $192 (6 bags)	$1,052

Crushed base @ $35/ton; bedding sand @ $45/ton; geotextile @ $0.30/ft² (driveway $0.40/ft²); polymeric joint sand @ $32/55-lb bag (one bag per ~90 ft²). Add paver cost separately.

Polymeric Joint Sand Coverage (2026)
Joint width	Joint depth	ft² per 55-lb bag	Bags per 100 ft²
1/16 in (tight)	1.5 in	120 ft²	0.84 bags
1/8 in (standard)	1.5 in	100 ft²	1.0 bag
3/16 in	1.5 in	80 ft²	1.25 bags
1/4 in (wide rustic)	2.0 in	65 ft²	1.55 bags
1/2 in (flagstone)	2.0 in	40 ft²	2.5 bags

Calculator above defaults to 90 ft²/bag (typical 1/8–3/16 in joint with 1.5-in depth).

Real-World Example Calculations

14 ft × 14 ft Foot Patio, 4-in Compacted Base

Backyard patio for table + 4 chairs; firm sandy-loam subgrade, no fabric.

Area: 196 ft²
Base depth (compacted): 4 in
Bedding sand: 1 in
Compaction factor: 1.25

Base / Sand / Fabric / Poly / Cost 2.7 t base / 0.8 t sand / 215 ft² fabric / 3 bags poly / $292 stack

Takeaway: Single tri-axle delivery of base + sand combined. Compact base in two 2-in lifts with rented plate compactor ($75/day). Total time DIY: weekend.

12 ft × 40 ft Paver Driveway, 8-in Compacted Base

Full residential driveway from county road to garage; clay subgrade requires 6-oz woven fabric.

Area: 480 ft²
Base depth (compacted): 8 in
Bedding sand: 1 in
Fabric: 6-oz woven @ $0.40/ft²

Base / Sand / Fabric / Poly / Cost 13.2 t / 2.0 t / 528 ft² / 6 bags / $876 stack

Takeaway: 8-in compacted base in two 4-in loose lifts (compact between). 6-oz woven fabric over compacted clay subgrade. Total install cost (base only, no pavers) typically $1,100–$1,400 including labor.

4 ft × 30 ft Walkway, 4-in Compacted Base

Front-walk from driveway to porch; light foot traffic + occasional garden cart.

Area: 120 ft²
Base depth (compacted): 4 in
Bedding sand: 1 in

Base / Sand / Poly / Cost 1.6 t / 0.5 t / 2 bags / $170 stack

Takeaway: Below the minimum-delivery threshold for separate crushed-base and sand orders — consider buying bagged crushed paver base ($6/0.5-ft³ bag) for projects under 150 ft².

Sources & Standards

These references are used for terminology, safety boundaries, and engineering assumptions. Local code, supplier specifications, and licensed design documents still control your project.

ICPI Tech Spec 2 — Construction of Interlocking Concrete Pavements (Residential) Interlocking Concrete Pavement Institute
Referenced for compacted base depth standards (residential foot 4-6 in / vehicular 6-12 in), 1-in (max 1.5 in) bedding sand layer, and ASTM C33 fine aggregate specification.
ICPI Tech Spec 4 — Structural Design of Interlocking Concrete Pavements Interlocking Concrete Pavement Institute
Referenced for vehicular and commercial paver applications: base depth, subgrade Proctor requirements, geotextile selection (woven 6-oz minimum).
ASTM C33/C33M — Standard Specification for Concrete Aggregates ASTM International
Referenced for paver bedding sand specification: washed, angular concrete sand meeting the C33 fine-aggregate gradation envelope.

Frequently Asked Questions

How deep should paver base be?

Per ICPI Tech Spec 2: foot patio 4–6 in compacted; walkway 4–6 in; light vehicle 6–8 in; full driveway 8–12 in. Always compacted depth, not loose — you order ~25% more loose material to land the compacted depth.

How thick should bedding sand be under pavers?

Exactly 1 in (max 1.5 in) per ICPI. Never thicker — thicker bedding sand migrates laterally under load and the pavers rut within 12–18 months. If the base is wavy enough that 1 in of sand can’t cover the high spots, the right fix is to re-screed and re-compact the base, not bump the sand thickness.

Do I need geotextile fabric under paver base?

For driveways and any subgrade with >12% clay content: yes, always. For foot patios on firm sandy soil: optional but recommended ($0.30/ft² fabric saves $5–$8/ft² in eventual base replacement). Use non-woven 4-oz for foot traffic, woven 6-oz for vehicular.

How many tons of paver base do I need?

For a 100 ft² patio at 4-in compacted depth: 1.4 tons of crushed base (loose, to order) + 0.4 tons of bedding sand. Total 1.8 tons for the base layers. The 1.4 tons is loose-tons-to-order; it compacts to ~1.1 tons in place.

What is the best material for paver base?

Dense-graded aggregate (DGA / crusher run / ABC / 3/4-in minus) at 110 lb/ft³ loose density, 8–15% fines content. The fines are critical — they let the base compact to 95% Proctor under a vibratory plate. Avoid: #57 clean stone (no fines, won’t lock); pea gravel (rounded, won’t compact); fill dirt (organic content, will settle).

Can I use polymeric sand on existing pavers?

Yes — blow out the existing joint sand (leaf blower + stiff broom; clean to at least 1.25 in depth), sweep in polymeric sand filling joints flush, compact lightly with a plate compactor (with rubber mat) or by foot, mist with water per manufacturer’s instructions (typically 2–3 light passes, not a flood). Best on a dry forecast — 24 hr no rain.

How much polymeric sand do I need for a paver patio?

At standard 1/8–3/16 in joints with 1.5 in joint depth: 1 bag (55 lb) per ~90 ft². A 14×14 patio = 196 ft² = 3 bags. Wide rustic 1/4 in joints: 1 bag per 65 ft². Flagstone 1/2 in joints: 1 bag per 40 ft².