Slump & Workability Guide
Slump target, water demand check and workability class per placement.
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Enter your values, then press Calculate Now to evaluate the output.
Guide — Slump & Workability Guide
The slump and workability calculator below follows standard Indian construction practice and the relevant IS-code conventions. Enter the site dimensions exactly as measured, press Calculate Now, then refine the quantities line by line in the live sheet before you export.
The slump cone measures consistency, not strength. IS 456 links slump ranges to placement: 25–75 mm for mass concrete, 50–100 mm for lightly reinforced slabs, 75–125 mm for beams and columns, and 100–150 mm for pumped concrete.
Never add water on site to recover lost slump. Every extra 10 litres per cubic metre raises the water-cement ratio by roughly 0.03 and cuts 28-day strength by around 5%. Use a plasticiser instead.
IS 456 caps the free water-cement ratio at 0.55 for moderate exposure, 0.50 for severe and 0.45 for very severe and marine conditions, regardless of what the strength calculation permits.
Treat every output as an indicative pre-tender estimate. Site conditions, wastage allowances, specification changes and local market rates all move the final figure, so validate against your drawings and approved rate analysis before procurement.
Master Measurement Sheet
| Sr. No. | Description | Unit | NOS 1 | NOS 2 | L | B | D | QTY | Action |
|---|---|---|---|---|---|---|---|---|---|
| 1 | 1.000 |
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About the Slump & Workability Guide
This tool is built for site engineers, quantity surveyors, contractors and property investors who need dependable numbers fast. Every input is reactive — changing a single field instantly recomputes the full output set, so you can run sensitivity checks on dimensions, grades and rates before committing to an estimate.
Keep unit consistency in mind: metric inputs (metres, square metres, cubic metres) produce metric outputs, with imperial and Indian trade units shown alongside where they are commonly used on site.