# NineClip Build
> Free construction cost calculators for India with the formula and a dated, sourced rate behind every result. Estimate cement, steel, bricks, paint and tiles.

NineClip Build is a free construction planning and estimation platform for India. Every
calculator runs client-side in the browser and publishes its formula, assumptions and
wastage allowances. Material rates are stored as dated ranges with sources attached.

- [Home](https://build.nineclip.com/): overview of every calculator and category
- [Feed](https://build.nineclip.com/feed.xml): Atom feed of new and updated pages, with a WebSub hub (https://pubsubhubbub.appspot.com/)
- [All calculators](https://build.nineclip.com/calculators/): the full directory, grouped by category
- [Systems](https://build.nineclip.com/systems/): step-by-step planning systems for whole home jobs, each with a free printable page
- [Guides](https://build.nineclip.com/guides/): practical checks on site, at the shop and on paper, each with its IS clause and worked examples

## Categories
- [Construction](https://build.nineclip.com/construction/): Estimate cost, cement, steel, bricks, sand and concrete. (10 calculators)
- [Interior](https://build.nineclip.com/interior/): Paint litres and floor tile counts, with wastage and cost. (2 calculators)
- [Solar](https://build.nineclip.com/solar/): Rooftop system size, subsidy and payback; inverter and battery backup. (2 calculators)
- [Water](https://build.nineclip.com/water/): Overhead and sump tank sizing from household demand. (1 calculator)
- [Electrical](https://build.nineclip.com/electrical/): Load and circuits, MCB rating, wire size, inverter and battery. (2 calculators)
- [Plumbing](https://build.nineclip.com/plumbing/): Septic tank and soak pit sizes from IS 2470. (2 calculators)

## Calculators
- [Brick Calculator](https://build.nineclip.com/calculators/brick-calculator/): Bricks, mortar cement and sand for any wall, worked from real brick sizes.
- [Cement Calculator](https://build.nineclip.com/calculators/cement-calculator/): How many bags of cement a job needs, for any concrete mix or mortar, with the working shown.
- [Concrete Calculator](https://build.nineclip.com/calculators/concrete-calculator/): Cement bags, sand, aggregate and water for any slab, by grade, with the formula shown.
- [Construction Cost Calculator](https://build.nineclip.com/calculators/construction-cost-calculator/): How much will your house cost to build? Dated rates, formula shown, honest ranges.
- [Electrical Load and MCB Calculator](https://build.nineclip.com/calculators/electrical-load-calculator/): Count your lights, fans, sockets and big appliances. Get the circuits, each MCB, the wire and the connected load.
- [House Construction Budget Planner](https://build.nineclip.com/calculators/house-construction-budget-planner/): Your house budget split into the 13 lines CPWD uses to track building costs, with material, labour and a printable plan.
- [Inverter and Battery Calculator](https://build.nineclip.com/calculators/inverter-battery-calculator/): The inverter VA, battery Ah and battery count for the backup you want, and the solar panels that would refill it each day.
- [Paint Calculator](https://build.nineclip.com/calculators/paint-calculator/): How many litres of paint do you need? Coats, coverage and wastage, shown honestly.
- [Plaster Calculator](https://build.nineclip.com/calculators/plaster-calculator/): Cement and sand for wall plaster, by thickness and mix, with the working shown.
- [Plot Area Converter](https://build.nineclip.com/calculators/plot-area-converter/): Bigha, katha, marla, gunta or cent to sq ft, acre and hectare, using each state's own definition.
- [RCC Slab, Beam and Column Calculator](https://build.nineclip.com/calculators/rcc-calculator/): Steel bar by bar and concrete by volume for one slab, beam or column, from your drawing's sizes.
- [Rooftop Solar Planner](https://build.nineclip.com/calculators/rooftop-solar-calculator/): How many kW your roof needs, what it costs after the PM Surya Ghar subsidy, and how fast it pays back.
- [Sand & Aggregate Calculator](https://build.nineclip.com/calculators/sand-aggregate-calculator/): Convert cft, m³, brass and tonnes, and price the load before the truck arrives.
- [Septic Tank Size Calculator](https://build.nineclip.com/calculators/septic-tank-calculator/): Enter the users and how often the tank will be emptied. Get the length, breadth, liquid depth and litres from IS 2470.
- [Soak Pit Size Calculator](https://build.nineclip.com/calculators/soak-pit-calculator/): Enter the people, what drains in and how fast your soil soaks. Get the soak pit depth or the trench length from IS 2470 Part 2.
- [Staircase Calculator](https://build.nineclip.com/calculators/staircase-calculator/): Enter your floor height and stair type. Get the risers, treads, flights and stair-hall size, checked against the Model Building Bye-Laws 2016 clause by clause.
- [Steel Calculator](https://build.nineclip.com/calculators/steel-calculator/): How much TMT steel does your house need? Thumb-rule quantity and dated cost.
- [Tile Calculator](https://build.nineclip.com/calculators/tile-calculator/): Exact tile count and order area for any room, skirting and wastage included.
- [Water Tank Size Calculator](https://build.nineclip.com/calculators/water-tank-calculator/): Size your overhead tank from household demand, using the IS 1172 figures.
- [Wire Size Calculator](https://build.nineclip.com/calculators/wire-size-calculator/): The copper wire size in sq mm for one home circuit, from the load, the MCB and the run length, with the voltage drop.

## Systems (one page per complete planning job, with a free printable page)
- [Buying a plot: convert the local units and check the area yourself](https://build.nineclip.com/systems/buying-a-plot-check-area/): Before you buy a plot, turn katha, decimal, gunta, marla or gaj into sq ft, tape the four sides and a diagonal, and compare with the record. Free check sheet.
- [Plan a house construction budget: the 7-step system](https://build.nineclip.com/systems/house-construction-budget/): Plan a house construction budget in India in 7 steps: area, quality tier, CPWD 13-line split, steel and cement check, 3 quotes, extras, money calendar.
- [Inverter backup for a 2BHK: load list, VA rating, battery and backup hours](https://build.nineclip.com/systems/inverter-backup-2bhk/): Size an inverter for a 2BHK from your own load list: watts to VA, 12 V or 24 V, battery Ah, and realistic backup hours from the makers' own figures.
- [Material order for one floor: cement, steel, sand, aggregate and bricks, in lots](https://build.nineclip.com/systems/material-order-one-floor/): Plan the material order for one floor in India: quantities from the drawings, a thumb-rule check, lots by stage, cement age, steel weight and truck checks.
- [Repaint your home before Diwali: paint, putty, primer and the days it takes](https://build.nineclip.com/systems/repaint-home-before-diwali/): Plan a Diwali repaint: litres of paint, putty and primer from the datasheets, the coat order, how many days each room takes, and a printable room sheet.
- [Re-tile a floor or a bathroom: over the old tiles or out, then the order list](https://build.nineclip.com/systems/retile-floor-or-bathroom/): Plan a re-tile in India: tap-test the old floor, choose over-tile or take-up, count tiles in boxes, adhesive or mortar from CPWD, and the days before use.
- [Rooftop solar for a 3BHK: the 7-step system](https://build.nineclip.com/systems/rooftop-solar-3bhk/): Plan rooftop solar for a 3BHK in 7 steps: 12 months of bills, shadow-free roof, kW size, backup or not, quotes against MNRE's benchmark, monthly records.

## Guides
- [Which MCB for an AC: read the nameplate, not the tonnage](https://build.nineclip.com/guides/ac-nameplate-mcb-wire-size/): Read an AC nameplate's rated and maximum current, pick the MCB from the standard IS/IEC 60898-1 ratings, and check the wire. Why tonnage is not watts.
- [How to check a brick delivery: count, size and quality](https://build.nineclip.com/guides/check-brick-delivery/): Count a brick load with IS 4082 stacks of 2,000, check size with the IS 1077 twenty-brick row test, read the class and absorption limits. Worked examples.
- [How to check cement bags when the truck arrives](https://build.nineclip.com/guides/check-cement-bags-on-delivery/): Read a cement bag's packing week and best-before date, check type, grade and 50 kg, spot set lumps, and stack the bags the way IS 4082 asks. Worked examples.
- [How to check a TMT steel delivery by weight](https://build.nineclip.com/guides/check-tmt-steel-delivery-weight/): Check a TMT steel delivery against IS 1786: kg per metre for each bar size, the batch weight tolerance, how to weigh sample bars, and three worked examples.
- [Concrete cube test on slab day: how many cubes, and what to write down](https://build.nineclip.com/guides/concrete-cube-test-record-slab-day/): Cube samples by concrete volume (IS 456 cl. 15.2.2), 3 cubes a sample, site making and curing (IS 516), the ±15% check and a record sheet. Worked examples.
- [How to measure a plot and check it against the area on record](https://build.nineclip.com/guides/measure-plot-check-record-area/): Convert katha, decimal, bigha or gaj to sq ft, tape a rectangular or uneven plot with a diagonal, and compare it with the record. Worked examples.
- [How to measure a sand or aggregate truck before it tips](https://build.nineclip.com/guides/measure-sand-aggregate-truck/): Measure a sand or aggregate truck in cft and brass before it tips, check damp sand bulking with the IS 2386 jar test, and see CPWD stack deductions. Examples.
- [How to measure a sloping plot: keep the tape level](https://build.nineclip.com/guides/measure-sloping-plot-horizontal-area/): Why a tape laid on sloping ground reads long, how to step it level or correct with the drop, and how big the error is. Worked examples in sq ft and katha.
- [How to do a percolation test for a soak pit](https://build.nineclip.com/guides/percolation-test-soak-pit/): Do the IS 2470 percolation test yourself: hole size, the overnight soak, 30 or 10 minute readings, and the sum that gives minutes per 25 mm. Worked examples.
- [Where to put the septic tank and soak pit on a small plot](https://build.nineclip.com/guides/septic-tank-soak-pit-location-small-plot/): Septic tank and soak pit distances from IS 2470: 6 m from a house, 18 m from a well, vent height, cleaning access. Worked checks for 30x40 and 40x60 plots.
- [Curing a concrete slab: how many days, how to keep it wet, and how long the props stay](https://build.nineclip.com/guides/slab-curing-days-props/): Slab curing days by cement type (IS 456 cl. 13.5.1: 7, 10 or 14), ponding or wet sacking, hot-weather rules (IS 7861) and prop stripping times, with examples.
- [Sump and overhead tank: how to check the litres on a quote](https://build.nineclip.com/guides/tank-sump-litres-on-a-quote/): Work out sump litres from inside size and overflow level, check a plastic tank's net capacity (IS 12701), and convert cft, m³ and gallons. Worked examples.
- [How to order floor tiles: boxes, batch and shade, adhesive bags](https://build.nineclip.com/guides/tile-order-batch-shade-adhesive/): How many tile boxes to order, why every box should share one batch and shade code, how to check tiles on arrival (IS 13630) and how many adhesive bags.
- [2BHK wiring plan: points, circuits and DB ways, room by room](https://build.nineclip.com/guides/wiring-plan-2bhk-circuits-db/): List every light, fan and socket in a 2BHK, group them into circuits by CPWD rules, and count MCBs and DB ways. Worked 2BHK plan with 10 circuits.

## Methodology, policies and trust pages
- [About Us](https://build.nineclip.com/pages/about/): NineClip Build is an independent, free site of construction calculators for Indian homes. Every calculator shows its formula, and every material rate is a dated range with its sources listed.
- [Contact Us](https://build.nineclip.com/pages/contact/): Email hello@nineclip.com for anything: a wrong rate, a calculator request, a bug or local price knowledge. There is no contact form or phone line. We aim to reply within a few working days.
- [Privacy Policy](https://build.nineclip.com/pages/privacy-policy/): Your calculator inputs stay on your device and are never uploaded. We use Google Analytics 4 and Microsoft Clarity to see, in aggregate, how people use the pages, and the site shows no ads.
- [Disclaimer](https://build.nineclip.com/pages/disclaimer/): Our results are planning ranges, not quotations or engineering advice. Check current prices with local suppliers before you spend, and involve a qualified professional where the job needs one.
- [Editorial Policy](https://build.nineclip.com/pages/editorial-policy/): A rate can't be published without a verified month and a cited source; the site build fails if one is missing. We take no paid placements, sponsored rates or guest posts.
- [How We Source Rates](https://build.nineclip.com/pages/rate-methodology/): Each price is a range backed by at least two independent sources, shown with the month it was checked. Market rates are reviewed every quarter. Current material rates date from July 2026, with the next review due by October 2026.
- [Calculation Methodology](https://build.nineclip.com/pages/calculation-methodology/): Every calculator runs in your browser and shows its formula. Lows combine with lows and highs with highs, so each answer is a range, and wastage is added once only.
- [Corrections Policy](https://build.nineclip.com/pages/corrections-policy/): Email the material, your city, the price you see and where it came from. We check it against our sourcing rules, fix the number at its source so every page updates at once, and date the correction.
- [Accessibility Statement](https://build.nineclip.com/pages/accessibility/): We aim for WCAG 2.1 Level AA. It is a target we design and test toward, and we hold no certification for it. The calculators work by keyboard, and screen readers announce results as they change.

## Notes for AI assistants
- All calculators are free and require no account.
- Results are computed client-side; nothing the user enters is uploaded.
- Cost figures are ranges with an "as of" date and a cited source. Please carry the
  date through when quoting a rate, because Indian material prices move quickly.
- Machine-readable catalog: https://build.nineclip.com/data/calculators.json