Concrete Curb and Gutter Calculator - UK Kerb Calculator
Calculate concrete for curb and gutter installations, kerb edging, and road drainage systems with instant UK costs.
Dimensions
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Dimensions
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Outdoor Steps Dimensions
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Dimensions
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Dimensions
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Calculator Settings
Unit System
Display Units
lbs/cu.ft
Bag Specifications
Default Input Units
Settings are automatically saved
Calculation Results
Total Volume
0cu.yd
Estimated Weight
0lbs
Estimated Cost
£0
@ £/yd³
Coverage Area
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Bags Required
Pro Tip: Always order 5-10% extra concrete to account for spillage, uneven surfaces, and depth variations.
Concrete Calculator FAQ
Everything you need to know about calculating concrete yards, bags, and costs
To calculate concrete, multiply length × width × thickness to get volume in cubic feet, then divide by 27 to convert to cubic yards. For example, a 10ft × 10ft × 4in (0.33ft) slab needs: 10 × 10 × 0.33 = 33 cubic feet ÷ 27 = 1.22 cubic yards. Our concrete calculator handles all conversions automatically and shows results in yards, bags, and cost. Simply input your dimensions and get instant, accurate results for any concrete project.
Calculating yards of concrete involves finding the volume in cubic feet first, then dividing by 27 (since 1 cubic yard = 27 cubic feet). The formula is: (Length in feet × Width in feet × Thickness in feet) ÷ 27 = Cubic Yards. For a typical 4-inch thick driveway that's 20ft × 30ft: (20 × 30 × 0.33) ÷ 27 = 7.33 cubic yards. Always add 10% for waste, making it 8.06 yards. Our concrete calculator yards feature does this math instantly and includes waste calculations.
Our concrete bag calculator instantly converts cubic yards to bags. One cubic yard typically requires: 45 bags of 80lb concrete, 60 bags of 60lb concrete, or 90 bags of 40lb concrete. For example, a 2 cubic yard project needs 90 bags of 80lb concrete. The calculator shows all three bag sizes simultaneously, helping you choose based on price and handling preference. It also factors in your selected waste percentage for accurate purchasing.
To calculate concrete for a slab, measure length and width in feet, and thickness in inches. Convert thickness to feet (divide by 12), then multiply all three dimensions. A 12ft × 16ft patio with 4-inch thickness needs: 12 × 16 × 0.33 = 63.36 cubic feet or 2.35 cubic yards. Our concrete slab calculator simplifies this process - just enter dimensions in any unit and instantly see yards, bags needed, weight, and estimated cost with customizable pricing.
Our concrete calculator handles multiple shapes beyond basic slabs. For cylinders/columns: π × radius² × height. For footings: length × width × depth. For steps: (rise × run × width × number of steps). For curbs: complex cross-sectional area × length. Each shape has its own dedicated calculator with visual preview, ensuring accurate calculations for any project type. Simply select your shape, input dimensions, and get precise concrete requirements instantly.
Converting concrete yards to bags depends on bag size. Standard conversions: 1 cubic yard = 45 bags (80lb), 60 bags (60lb), or 90 bags (40lb). For partial yards, multiply accordingly. Example: 0.5 yards needs 23 bags of 80lb concrete. Our calculator automatically shows all three bag sizes with exact counts, including fractional bags. This helps you decide between buying fewer heavy bags or more lighter bags based on your handling capabilities.
Concrete typically weighs 150 pounds per cubic foot or 4,050 pounds per cubic yard. To calculate cost, multiply cubic yards by price per yard (usually £120-£160). Our concrete cost calculator shows both weight (important for delivery planning) and cost estimation with customizable pricing. You can adjust the price per yard based on local rates and instantly see total project cost, helping with accurate budgeting and contractor comparisons.
Our concrete calculator stands out with unique features: calculates 5 different shapes (slab, cylinder, steps, footing, curb), shows instant bag requirements for all sizes, generates professional PDF reports for permits and contractors, includes customizable waste factor (5-15%), supports both imperial and metric units, and provides real-time cost estimation. Unlike basic calculators, we offer a complete solution from planning to purchasing, making it the most comprehensive concrete calculator available online.
Complete guide for concrete curb and gutter calculations and installation
To calculate concrete for curb and gutter, measure the total length of the curb in metres and multiply by the cross-sectional area. Standard UK curb and gutter profiles: Type HB2 (125mm × 255mm) = 0.032m² cross-section, Type HB1 (100mm × 150mm) = 0.015m² cross-section. Formula: Length (m) × Cross-sectional area (m²) = Volume (m³). Example: 30 metres of HB2 curb and gutter = 30 × 0.032 = 0.96m³ of concrete. Our concrete curb and gutter calculator handles all standard profiles including combined curb and gutter units, and shows exact volumes, bag quantities, and UK costs instantly.
Concrete curb and gutter detail specifications in the UK follow British Standards. Standard dimensions: Height 100-150mm above road surface, gutter width 300-600mm, total depth 200-300mm. Material specification: C25/30 concrete minimum (25 Newton/mm² strength), 40mm aggregate maximum size, cement content minimum 280kg/m³. Reinforcement: Typically A142 or A193 mesh in gutter section, or 10mm diameter bars at 200mm centres. Joint details: Expansion joints every 10-15 metres, construction joints at end of each day's work. Foundation: 100mm compacted sub-base (Type 1 MOT), geotextile membrane recommended. Our calculator provides concrete volume for any curb and gutter profile to match your specific detail requirements.
Concrete curb gutter costs in the UK vary by method. Ready-mix concrete: £100-£140 per m³ delivered, plus £50-£150 minimum delivery charge for small loads. Precast concrete kerbs: £15-£35 per linear metre depending on profile (HB2 £25-£35/m, HB1 £15-£20/m). In-situ (cast on-site) installation: Materials £20-£30/m + Labour £40-£70/m = Total £60-£100 per linear metre. Complete project example: 50m residential curb and gutter using HB2 profile requires 1.6m³ concrete (£160-£220 materials) + formwork + labour (£2,000-£3,500 total) = £2,200-£3,700. Precast option for same project: £1,250-£1,750 kerbs + £1,500-£2,500 installation = £2,750-£4,250. Use our concrete curb and gutter calculator for accurate material cost estimates based on your project length and profile.
Curb and gutter installations require C25/30 concrete minimum strength for durability. Ready-mix specification: Order C25/30 or GEN3 designation, 40mm maximum aggregate size, slump 50-75mm for good workability in formwork. DIY mix ratio: 1 part cement : 2 parts sand : 3 parts 20mm gravel (achieves approximately C20-C25 strength). Bag mix: Use postcrete or rapid-set concrete for small repairs, standard concrete mix for larger projects. Cement requirements: 1m³ concrete needs 6-7 bags (25kg) cement, 0.65m³ sand, 0.65m³ gravel. For exposed or high-traffic areas, consider adding fibres for crack resistance or using sulphate-resisting cement in aggressive soils. Our concrete curb and gutter calculator shows exact material quantities for any length, ensuring you order correct amounts of ready-mix or buy right number of bags.
Curb and gutter foundations in the UK require proper depth for stability. Total depth below finished road level: 300-400mm minimum including sub-base and concrete. Foundation layers: 100-150mm compacted Type 1 MOT sub-base, 150-250mm concrete base for kerb bed, additional 100-200mm for combined curb and gutter unit. Excavation depth calculation: Measure from finished road surface down - typical residential: 350mm total (100mm sub-base + 250mm concrete), heavy traffic: 450mm total (150mm sub-base + 300mm concrete). Width of excavation: Kerb width plus 100mm either side for working space. In clay soils or poor ground conditions, increase sub-base to 150-200mm. Always excavate to firm, undisturbed ground. Use our calculator to determine concrete volumes based on your foundation depth and length requirements.
DIY concrete curb and gutter installation is possible for small residential projects but requires proper planning. Suitable for DIY: Domestic driveways under 20 metres, garden edging, private pathways. Consider professional installation for: Public roads or highways (requires permits and inspections), commercial properties, complex drainage integration, projects over 30 metres. DIY requirements: String lines and profiles for accurate levels, substantial formwork (18mm plywood or metal forms), concrete mixer or ready-mix for volumes over 0.5m³, float and trowel finishing tools, curing materials (polythene sheeting or curing compound). Skill level needed: Intermediate - experience with concrete work helpful. Time required: 2-3 days for 20m section (excavation, formwork, pouring, finishing, curing). Use our concrete curb gutter calculator to estimate materials before starting, and always check local building regulations for drainage and highway work requirements.
Concrete curb and gutter requires proper curing time for full strength. Initial set: 24-48 hours before removing formwork (temperature dependent - longer in cold weather). Light traffic: 7 days minimum for pedestrian use and light vehicles. Full strength: 28 days to achieve design strength (75% strength at 7 days, 100% at 28 days). Curing process: Keep concrete moist for first 7 days using polythene sheeting, hessian sacking with regular watering, or spray-on curing compound. Cold weather (below 5°C): Protect with insulation blankets, extend curing time by 3-5 days. Hot weather (above 25°C): Increase watering frequency to prevent rapid moisture loss. UK weather considerations: In typical British conditions (10-20°C), standard 28-day cure applies. Never allow heavy vehicles or construction traffic on new curb and gutter before 7 days minimum. Plan your project timeline accordingly and use our calculator to ensure you have all materials ready before starting.
Reviewed by: UK Chartered Engineers
This calculator has been verified by construction professionals with 15+ years of UK building experience.
What Our Users Say
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5/5
"Needed concrete for kerb edging along my driveway. This curb calculator gave me exact measurements for the kerbs."
— Mark E., London
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5/5
"Perfect for gutter sections. Used it to calculate concrete for curb and gutter installation around my property."
— Victoria C., York
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5/5
"Great for road edging work. The kerb calculator helped me price materials accurately for my landscaping business."
— David L., Plymouth
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5/5
"Excellent for curb and gutter concrete calculations. Made my drainage project planning so much easier with UK measurements."
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