Free Online Tools & Calculators — BTTOTEK Solutions
BTTOTEK Solutions brings site-ready civil engineering estimators and real-estate analytics into a single reactive workspace — from bar bending schedules to stamp duty and rental yield.
IS-code aligned formulas
Dry volume factors, d²/162 steel weights and standard mix ratios baked in.
Fully reactive
Every field recomputes instantly — run sensitivity checks without reloading.
Site & investor ready
Quantities map to BOQ lines; property outputs map to lender and registry needs.
Civil & Construction
Bar Bending Schedule (BBS) Pro
Rebar cutting length, shape codes and total steel weight in kg/ton.
Open calculatorConcrete & Mortar Estimator
M5–M30 mix design: dry volume, cement bags, sand, aggregate and water.
Open calculatorBrickwork Calculator
Number of bricks, mortar volume, cement and sand for any wall.
Open calculatorPlastering Calculator
Mortar, cement bags and sand for internal/external plaster.
Open calculatorEarthwork & Excavation
Excavation volume, bulked soil, trips and total earthwork cost.
Open calculatorBrick vs AAC Block Comparison
Cost, weight and thermal comparison for a wall in brick or AAC.
Open calculatorCement Bag & Volume Converter
Convert between bags, kilograms, cubic metres and cubic feet.
Open calculatorSand & Aggregate Volume
Convert between tonnes, cubic metres, cubic feet and truck loads.
Open calculatorStructural
Beam Concrete & Steel
RCC beam volume, cement/sand/aggregate and steel estimate.
Open calculatorColumn Concrete & Steel
RCC column volume with rectangular or circular sections.
Open calculatorSlab Concrete Estimator
Slab volume, materials and steel for one-way/two-way slabs.
Open calculatorFooting / Foundation Estimator
Isolated footing (PCC + sloped/rectangular pad) concrete quantity.
Open calculatorSteel Weight & Section Chart
Unit weight and total weight for rebar and structural steel sections.
Open calculatorLap & Development Length
Tension/compression lap and Ld for a given bar, grade and concrete.
Open calculatorShuttering / Formwork Area
Contact area, plywood sheets and props for slabs, beams and columns.
Open calculatorStaircase Quantity & Riser Check
Riser/tread geometry, concrete volume and steel for a flight.
Open calculatorRetaining Wall Estimator
Concrete, steel and earth pressure check for a cantilever wall.
Open calculatorPile Foundation Capacity
Concrete volume, steel and indicative bearing capacity per pile.
Open calculatorWall Load on Beam
Dead load per running metre from masonry and plaster on a beam.
Open calculatorBeam Span / Depth Check
Serviceability depth check against IS 456 span-to-depth limits.
Open calculatorFinishing
Tile & Flooring Calculator
Tile count, wastage, adhesive and grout for any floor or wall area.
Open calculatorPaint & Putty Calculator
Litres of primer, putty and finish paint for interior or exterior walls.
Open calculatorWaterproofing Estimator
Membrane, coating and chemical quantity for roofs, basements and toilets.
Open calculatorFalse Ceiling Calculator
Gypsum board, channels, screws and jointing compound per ceiling area.
Open calculatorWall Putty Coverage
Putty bags, coats and cost for smooth wall finishing.
Open calculatorInfrastructure
Road & Pavement Quantity
GSB, WMM, DBM and BC layer volumes and bitumen for a road stretch.
Open calculatorBox Culvert Quantity
Concrete and steel for RCC box culverts including wing walls.
Open calculatorDrainage & Sewer Line
Trench excavation, bedding, pipe count and backfill for a pipeline.
Open calculatorSeptic Tank Sizing
Tank capacity, dimensions and soak pit sizing per IS 2470.
Open calculatorWater Tank Capacity
Litres, dimensions and demand check for overhead or underground tanks.
Open calculatorRooftop Solar Sizing
Panel count, roof area, generation and payback for a rooftop plant.
Open calculatorRainwater Harvesting Potential
Harvestable volume, tank sizing and recharge pit capacity.
Open calculatorQuality Control
Field Compaction & Density
Degree of compaction from field dry density against Proctor MDD.
Open calculatorConcrete Cube Test Result
Compressive strength from cube load with IS 456 acceptance check.
Open calculatorSlump & Workability Guide
Slump target, water demand check and workability class per placement.
Open calculatorSafe Bearing Capacity
Terzaghi ultimate and safe bearing capacity for shallow footings.
Open calculatorCuring Water Requirement
Water volume and duration for proper concrete curing.
Open calculatorReal Estate & Finance
Plot & Land Area Converter
Sq.Ft, Gaj, Acre, Hectare, Bigha, Biswa, Guntha, Marla, Sq.M.
Open calculatorStamp Duty & Registration Fee
State and gender dependent stamp duty with registration charges.
Open calculatorRental Yield & Property ROI
Gross yield, net yield, cash-on-cash return and payback period.
Open calculatorCarpet / Built-Up & Circle Rate
Carpet, built-up, super built-up areas and circle rate valuation.
Open calculatorHome Loan EMI & Amortization
EMI, total interest and a year-by-year amortization chart.
Open calculatorHouse Construction Cost / Sq.Ft
Material, labour and contractor breakdown for turnkey construction.
Open calculatorBOQ Rate Analysis
Line-item rate build-up with material, labour, overhead and profit.
Open calculatorLabour & Manpower Planner
Crew size, man-days and wage cost from output norms.
Open calculatorProject Cash Flow (S-Curve)
Monthly billing, retention and net cash position across a project.
Open calculatorGST on Property & Works
GST payable on under-construction property and works contracts.
Open calculatorProperty Tax Estimator
Annual municipal tax from unit area value and usage factors.
Open calculatorHome Loan Eligibility
Maximum loan from income, FOIR and tenure with affordability check.
Open calculatorRent vs Buy Analyser
Compare total cost of renting against owning over a holding period.
Open calculatorFSI / FAR & Coverage
Permissible built-up area, ground coverage and setback check.
Open calculator