All tools

Construction calculators

Browse the full set of construction calculators for materials, earthworks, drainage, planning, productivity and commercial checks.

Concrete & Materials

Concrete Volume Calculator

Estimate concrete volume from length, width and depth, with an optional waste allowance.

Concrete & Materials

Tonnes to Cubic Metres Calculator

Convert tonnes to cubic metres using a material density.

Concrete & Materials

Cubic Metres to Tonnes Calculator

Convert cubic metres to tonnes using a material density.

Concrete & Materials

Aggregate Tonnage Calculator

Estimate tonnes of aggregate needed from area, depth and density.

Concrete & Materials

Topsoil Volume Calculator

Estimate topsoil volume and approximate bulk bags from area and depth.

Earthworks

Excavation Volume Calculator

Calculate in-situ excavation volume, loose bulked volume, approximate tonnes and lorry loads.

Earthworks

Trench Excavation Calculator

Estimate trench excavation quantities from trench length, width and depth.

Earthworks

Lorry Loads Calculator

Estimate the number of lorry loads needed for a quantity of material.

Earthworks

Bulking Factor Calculator

Convert in-situ material volume to loose volume after excavation.

Earthworks

Shrinkage / Compaction Calculator

Estimate compacted volume after applying a shrinkage or compaction percentage.

Roads & Surfacing

Asphalt Tonnage Calculator

Estimate asphalt tonnage from area, layer depth and density.

Roads & Surfacing

Hardcore / Sub-base Calculator

Estimate Type 1 or hardcore volume and tonnage from area and depth.

Reinforcement

Rebar Weight Calculator

Estimate reinforcement bar weight from diameter, length and number of bars.

Reinforcement

Mesh Sheet Calculator

Estimate how many reinforcement mesh sheets are required for a rectangular area.

Building Quantities

Bricks / Blocks Calculator

Estimate brick or block quantities from wall area.

Building Quantities

Plasterboard Sheet Calculator

Estimate plasterboard sheets required from wall or ceiling area.

Building Quantities

Paint Coverage Calculator

Estimate litres of paint needed from area, number of coats and coverage rate.

Drainage & Levels

Pipe Gradient Calculator

Calculate pipe fall from length and gradient percentage.

Drainage & Levels

Fall to Gradient Calculator

Convert a known fall over a length into gradient percentage and ratio.

Drainage & Levels

Ramp Gradient Calculator

Calculate ramp gradient, percentage and ratio from rise and run.

Planning & Dates

UK Working Days Calculator

Count working days between two dates, excluding weekends and optional England & Wales bank holidays.

Planning & Dates

Programme Duration Calculator

Calculate calendar days and weekdays between two programme dates.

Planning & Dates

NEC Deadline Date Calculator

Add calendar or working days to a start date to estimate a due date.

Planning & Dates

Rainfall Threshold Days Calculator

Count how many daily rainfall readings exceed a selected threshold.

Productivity & Reporting

Productivity Rate Calculator

Calculate output per day, per hour or per gang from total quantity and time.

Productivity & Reporting

Required Production Rate Calculator

Calculate the daily production rate needed to finish a remaining quantity by a target date.

Productivity & Reporting

Progress Percentage Calculator

Calculate progress percentage, remaining quantity and variance to target.

Productivity & Reporting

Earned Value Calculator

Calculate SPI, CPI, SV and CV from PV, EV and AC.

Productivity & Reporting

Plant Utilisation Calculator

Calculate productive percentage, downtime and overall utilisation from plant hours.

Commercial & Costs

Cost Per Unit Calculator

Calculate cost per m³, tonne, linear metre, item or test.

Commercial & Costs

Waste Allowance Calculator

Add or reverse-engineer a percentage allowance on a base quantity.

Commercial & Costs

Labour Cost Calculator

Estimate labour cost from operatives, hours, hourly rate and overtime.

Commercial & Costs

Plant Hire Cost Calculator

Estimate plant hire cost including hire, fuel, delivery and other daily charges.

Commercial & Costs

Material Cost Calculator

Calculate material cost from quantity, unit rate, waste allowance, discount and delivery.

Commercial & Costs

Subcontractor Cost Calculator

Estimate subcontract package cost from quantity, rate, prelims, risk and fixed extras.

Commercial & Costs

Daywork Cost Calculator

Estimate daywork cost from labour, plant, materials and markup.

Commercial & Costs

Cost Per Cubic Metre Calculator

Calculate cost per m³ from total cost and completed volume.

Commercial & Costs

Cost Per Tonne Calculator

Calculate cost per tonne from total cost and tonnage.

Commercial & Costs

Cost Per Linear Metre Calculator

Calculate cost per linear metre for drainage, kerbs, fencing, ducting or walls.

Commercial & Costs

Markup and Margin Calculator

Compare selling price, profit, markup percentage and gross margin.

Commercial & Costs

Overhead and Profit Calculator

Add overhead and profit percentages to a direct cost to estimate a tender or charge-out price.

Commercial & Costs

Prelims Allocation Calculator

Allocate project preliminaries across weeks, working days or a work package duration.

Commercial & Costs

Contingency Allowance Calculator

Add a contingency or risk allowance to a base cost.

Commercial & Costs

Retention Calculator

Estimate retention held on an application or payment certificate.

Commercial & Costs

VAT Calculator

Add or remove VAT from a net or gross amount using a chosen VAT rate.

Commercial & Costs

Contractor Day Rate Income Calculator

Estimate gross annual contractor income from day rate, working pattern and time off.