Skip to main content

RMC Rate Calculator — Cost per m³ & Plant Output

Two tabs: Tab A builds the ₹/m³ cost from an IS 10262 typical BOM (cement, SCM, sand, CA, admixture, water) with freight, wastage, profit and GST; Tab B sizes your plant throughput — m³ per hour, shift and month — and tells you whether the mixer or the truck fleet is the bottleneck.

RMC rate — transit mixer and plant conveyor with cost indicator

RMC rate

Unit costs (₹)

Commercial

Customer rate

₹ / m³

Material cost
₹
Freight
₹
Ex-plant
₹

BOM per m³

Cement kg · ₹
Fly ash kg · ₹
Sand kg · ₹
Coarse agg. kg · ₹
Admixture kg · ₹
Water L · ₹

Plant output

m³/hr

m³ / shift
m³ / month
Batches / hr
Limiting factor
Mixer utilisation
%

How this is calculated

Cost (Tab A): Material cost is the sum of (qty per m³ from IS 10262:2019 Annex A) × (unit cost) (Reaffirmed 2023) for cement, fly ash, sand, coarse aggregate, admixture and water. Add freight (₹/km/m³ × plant distance). Apply wastage %, profit % and GST % as multiplicative factors on the subtotal.

Production (Tab B): Mixer throughput = 3600 / cycle time (batches per hour). Truck throughput = (60 / round trip) × truck count. Actual output is the lower of the two — that's your bottleneck. Fleet utilisation = actual / mixer.

Why the BOM template? IS 10262:2019 gives worked examples in its informative Annex A — these are median crushed-aggregate mixes, MSA 20 mm, 75–100 mm slump, no admixture unless noted. They're a defensible starting point for cost estimation; a project-specific mix design from a designer-of-record supersedes them for actual production.

Worked example

M30, Pune, 25 km delivery, 30 % fly ash, 1 % admixture, 5 % wastage, 10 % profit, 18 % GST.

Cement 280 kg × ₹7 = ₹1,960 · Fly ash 120 kg × ₹2.5 = ₹300 · Sand 650 kg × ₹1.2 = ₹780 · CA 1240 kg × ₹1.4 = ₹1,736 · Admixture 4 kg × ₹120 = ₹480 · Water 160 L × ₹0.05 = ₹8. Subtotal ₹5,264.

Freight 25 × ₹4 = ₹100. × 1.05 (wastage) × 1.10 (profit) = Ex-plant ₹6,182. × 1.18 (GST) = ₹7,295 / m³ delivered.

Plant (Tab B): 1 m³ mixer, 90 s cycle, 6 trucks × 10-min round trip → 40 batches/hr mixer vs 36/hr trucks → truck-bound, 36 m³/hr, 288 m³/shift, 7,200 m³/month at 90 % mixer utilisation.

FAQ

How is RMC rate per m³ calculated?

Sum the material cost (cement + sand + CA + admixture + water) from IS 10262 typical mix BOM, add freight (₹/km × distance), apply wastage %, profit % and GST % multiplicatively. The BOM uses crushed-aggregate typical quantities per m³ for grades M20–M60.

What determines whether the plant or the truck fleet is the bottleneck?

Mixer throughput = 3600 / cycle time (batches/hr). Truck throughput = (60 / round-trip min) × trucks. Actual output = min of the two. If trucks < mixer, you're truck-bound and need more trucks. If mixer < trucks, you're mixer-bound and need a faster mixer or shorter cycle.

Does fly ash replacement always reduce cost?

In this template, yes — fly ash at ₹2.5/kg replaces cement at ₹7/kg. But real projects must also weigh (a) longer setting time, (b) slower early strength, (c) durability requirements per IS 456 exposure class, and (d) IS 16714 / IS 1489 part compliance. The cost saving is real; the trade-off is in schedule.

Why isn't the GST on materials + freight separately?

In India, GST on RMC is normally 18 % on the all-in delivered price (the "composite supply" treatment under GST law — cement supply is ancillary to the concrete supply). The calculator applies GST once on the ex-plant price. Consult your CA for ITC claims on input materials.

§ 99

Calculator companions

Often used together with this calculator — pick the next step in your design or QA loop.

Mix Design Report

Cost basis mix.
Concrete Temperature

Ice / chilled water cost.
Evaporation Rate

Hot-weather admixture cost.
Curing Water

Curing cost / m².

Visualisation

Indicative tool — not a substitute for engineering judgement. Results are computed from formulae and reference values cited to Indian Standards and other published codes as named on this page, using nominal default assumptions; clause and table references are given in good faith for study and preliminary checks. Always verify the current edition and amendments of any cited standard in the BIS catalogue before relying on it. Final mix proportions, structural checks and construction decisions must be confirmed by a qualified engineer against the project design brief, drawings and site conditions. ConcreteInfo accepts no liability for design, procurement or construction decisions taken on the basis of these tools. Code references & rights: Indian Standards are the property of the Bureau of Indian Standards (© BIS) — official PDFs at bis.gov.in. Shared in good faith as technical reference for the civil engineering fraternity — always verify against the official publication.

Deep dive: read the full significance guide — the code clauses, assumptions and site meaning behind these numbers.