51 Professional Engineering & Property Calculators

BTTOTEK Solutions — Construction, Engineering, Property & Finance Calculators

Professional calculation tools for civil engineering, structural quantities, concrete, reinforcement, property valuation, loans and finance — with flexible unit options where applicable.

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Clear calculation methods

Each calculator shows its inputs, units, assumptions and calculation guidance so you can review the result.

Fast and practical

Enter project values and compare scenarios without repeatedly doing the same arithmetic by hand.

Built for verification

Use results as preliminary estimates and independent checks, then verify consequential decisions against the relevant source.

Civil & Construction

Bar Bending Schedule (BBS) Pro

Rebar cutting length, shape codes and total steel weight in kg/ton.

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Concrete & Mortar Estimator

M5–M30 mix design: dry volume, cement bags, sand, aggregate and water.

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Brickwork Calculator

Number of bricks, mortar volume, cement and sand for any wall.

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Plastering Calculator

Mortar, cement bags and sand for internal/external plaster.

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Earthwork & Excavation

Excavation volume, bulked soil, trips and total earthwork cost.

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Brick vs AAC Block Comparison

Cost, weight and thermal comparison for a wall in brick or AAC.

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Cement Bag & Volume Converter

Convert between bags, kilograms, cubic metres and cubic feet.

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Sand & Aggregate Volume

Convert between tonnes, cubic metres, cubic feet and truck loads.

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Structural

Beam Concrete & Steel

RCC beam volume, cement/sand/aggregate and steel estimate.

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Column Concrete & Steel

RCC column volume with rectangular or circular sections.

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Slab Concrete Estimator

Slab volume, materials and steel for one-way/two-way slabs.

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Footing / Foundation Estimator

Isolated footing (PCC + sloped/rectangular pad) concrete quantity.

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Steel Weight & Section Chart

Unit weight and total weight for rebar and structural steel sections.

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Lap & Development Length

Tension/compression lap and Ld for a given bar, grade and concrete.

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Shuttering / Formwork Area

Contact area, plywood sheets and props for slabs, beams and columns.

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Staircase Quantity & Riser Check

Riser/tread geometry, concrete volume and steel for a flight.

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Retaining Wall Estimator

Concrete, steel and earth pressure check for a cantilever wall.

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Pile Foundation Capacity

Concrete volume, steel and indicative bearing capacity per pile.

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Wall Load on Beam

Dead load per running metre from masonry and plaster on a beam.

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Beam Span / Depth Check

Serviceability depth check against IS 456 span-to-depth limits.

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Finishing

Tile & Flooring Calculator

Tile count, wastage, adhesive and grout for any floor or wall area.

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Paint & Putty Calculator

Litres of primer, putty and finish paint for interior or exterior walls.

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Waterproofing Estimator

Membrane, coating and chemical quantity for roofs, basements and toilets.

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False Ceiling Calculator

Gypsum board, channels, screws and jointing compound per ceiling area.

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Wall Putty Coverage

Putty bags, coats and cost for smooth wall finishing.

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Infrastructure

Road & Pavement Quantity

GSB, WMM, DBM and BC layer volumes and bitumen for a road stretch.

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Box Culvert Quantity

Concrete and steel for RCC box culverts including wing walls.

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Drainage & Sewer Line

Trench excavation, bedding, pipe count and backfill for a pipeline.

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Septic Tank Sizing

Tank capacity, dimensions and soak pit sizing per IS 2470.

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Water Tank Capacity

Litres, dimensions and demand check for overhead or underground tanks.

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Rooftop Solar Sizing

Panel count, roof area, generation and payback for a rooftop plant.

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Rainwater Harvesting Potential

Harvestable volume, tank sizing and recharge pit capacity.

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Quality Control

Field Compaction & Density

Degree of compaction from field dry density against Proctor MDD.

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Concrete Cube Test Result

Compressive strength from cube load with IS 456 acceptance check.

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Slump & Workability Guide

Slump target, water demand check and workability class per placement.

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Safe Bearing Capacity

Terzaghi ultimate and safe bearing capacity for shallow footings.

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Curing Water Requirement

Water volume and duration for proper concrete curing.

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Real Estate & Finance

Plot & Land Area Converter

Sq.Ft, Gaj, Acre, Hectare, Bigha, Biswa, Guntha, Marla, Sq.M.

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Stamp Duty & Registration Fee

State and gender dependent stamp duty with registration charges.

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Rental Yield & Property ROI

Gross yield, net yield, cash-on-cash return and payback period.

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Carpet / Built-Up & Circle Rate

Carpet, built-up, super built-up areas and circle rate valuation.

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Home Loan EMI & Amortization

EMI, total interest and a year-by-year amortization chart.

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House Construction Cost / Sq.Ft

Material, labour and contractor breakdown for turnkey construction.

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BOQ Rate Analysis

Line-item rate build-up with material, labour, overhead and profit.

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Labour & Manpower Planner

Crew size, man-days and wage cost from output norms.

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Project Cash Flow (S-Curve)

Monthly billing, retention and net cash position across a project.

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GST on Property & Works

GST payable on under-construction property and works contracts.

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Property Tax Estimator

Annual municipal tax from unit area value and usage factors.

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Home Loan Eligibility

Maximum loan from income, FOIR and tenure with affordability check.

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Rent vs Buy Analyser

Compare total cost of renting against owning over a holding period.

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FSI / FAR & Coverage

Permissible built-up area, ground coverage and setback check.

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Technical Publications & Field Guides

Engineering Guides & Practical Field Insights

Deep-dive tutorials, code compliance notes (IS 456, IS 1786, NBC), site measurement checklists, and quantity surveying workflows authored for civil professionals.

Explore all 30 guides

Civil & Construction7 min read

How to Prepare a Construction Material Estimate for a Small Building

A systematic guide to estimating cement, sand, coarse aggregate, rebar, bricks, and finishing materials for residential construction without relying on misleading thumb rules.

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Civil & Construction8 min read

RCC Quantity Estimation: Concrete, Steel and Shuttering Formwork Step by Step

A complete engineering breakdown of RCC quantity estimation covering concrete volume, reinforcement tonnage, contact formwork area, and standard deduction rules.

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Civil & Construction7 min read

How to Calculate Brickwork Quantity and Mortar from a Building Plan

A complete guide to calculating brick quantities, wet and dry mortar volumes, cement bags, sand tonnage, and standard opening deduction rules from building drawings.

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Civil & Construction7 min read

Sand and Aggregate Estimation for Concrete Work: Bulking and Sieve Grading Explained

Understand the mechanics of sand bulking, moisture corrections, coarse aggregate grading (10mm vs 20mm proportions), and exact batch calculations for concrete mixes.

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Civil & Construction8 min read

How to Prepare a Basic BOQ for Residential Construction: Format, Line Items and Measurement Rules

A complete guide to drafting an actionable Bill of Quantities (BOQ) for residential home construction, including standard trade classifications, measurement units, and item descriptions.

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Civil & Construction7 min read

Construction Material Wastage: Practical Allowances and Site Control Methods

A technical guide to managing material shrinkage, handling losses, rebar scrap reduction, cement bag preservation, and establishing realistic wastage allowances in building estimates.

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Construction and engineering calculation tools

BTTOTEK provides practical tools for repetitive calculation tasks such as reinforcement quantity checks, concrete and masonry estimates, plastering, excavation, structural quantity take-offs and other construction planning work. Enter measurements from the latest project documents, keep the displayed units consistent, and review the assumptions before using a result.

These calculators are intended to make arithmetic faster and easier to check. They do not replace approved drawings, specifications, site measurements, geotechnical information, structural design or professional judgement.

Property and financial estimates

Property-related tools can help with early comparisons involving land area, valuation, rental yield, stamp duty and home-loan payments. Rates, taxes, government charges and lender terms can vary by location and date, so treat these outputs as estimates and confirm current information with the relevant authority, lender or qualified professional.

For every calculator, keep a record of the values, units, assumptions and calculation date when the result will be used later.

How to get a reliable result

1. Use current source data. Take dimensions, rates and technical values from the latest available documents.
2. Check the units. Confirm mm, m, sq ft, sq m, kg, tonnes, litres and other units as results calculate in real time.
3. Review assumptions. Read the method and project-specific assumptions shown on the calculator page.
4. Independently verify. Recheck important arithmetic and confirm applicable standards, rules or professional requirements.