Free online calculators
Construction
- Concrete CalculatorWork out how much concrete you need for a slab, base or footing.
- Screed CalculatorWork out how much floor screed you need for a room.
- Ballast CalculatorWork out the ballast and cement needed to mix your own concrete.
- Sand and Cement CalculatorWork out the sand and cement needed for a volume of 4:1 mortar.
- Brick CalculatorWork out how many bricks you need for a wall.
- Plasterboard CalculatorWork out how many plasterboard sheets you need for a wall or ceiling.
- Tarmac CalculatorWork out how many tonnes of tarmac you need for a drive or path.
- Roof Pitch CalculatorFind your roof pitch in degrees and as a ratio from the rise and run.
- Paving CalculatorWork out how many paving slabs you need.
- Stud Wall CalculatorWork out how many vertical studs your wall needs.
- Block CalculatorWork out how many blocks you need for a wall.
- Asphalt CalculatorWork out how many tonnes of asphalt you need.
- Roof Tile CalculatorWork out how many roof tiles you need.
- Mortar CalculatorWork out the sand and cement needed for a volume of mortar.
- Plaster CalculatorWork out how much plaster you need for a wall or ceiling.
- Extension Cost CalculatorEstimate the build cost of an extension from your own rate.
Home Improvement
- Tile CalculatorWork out how many tiles you need for a wall or floor.
- Flooring CalculatorWork out how much flooring you need for a room.
- Paint CalculatorWork out how much paint you need for your walls.
- Carpet CalculatorWork out how much carpet you need for a room.
- Insulation CalculatorWork out how many insulation boards or rolls you need.
- Wallpaper CalculatorWork out how many rolls of wallpaper you need.
- Grout CalculatorWork out how much grout you need for a tiled area.
Garden & Landscaping
- Decking CalculatorWork out how many decking boards you need for your deck.
- Patio CalculatorWork out how many paving slabs you need for your patio.
- Gravel CalculatorWork out how much gravel you need for a drive, path or border.
- Topsoil CalculatorWork out how much topsoil you need for a bed, lawn or border.
- Turf CalculatorWork out how many rolls of turf you need for your lawn.
- Soil CalculatorWork out how much soil you need for a bed or border.
- Fence CalculatorWork out how many fence panels and posts you need.
Business & Marketing
- Markup CalculatorWork out the markup percentage between your cost price and selling price.
- Profit Margin CalculatorWork out your profit and profit margin from cost and selling price.
- Gross Profit CalculatorWork out gross profit and gross margin from revenue and cost of goods sold.
- ROI CalculatorWork out your return on investment from the amount invested and the amount returned.
- ROAS CalculatorWork out your return on ad spend from advertising spend and advertising revenue.
- CPM CalculatorWork out your cost per thousand impressions from advertising cost and impressions.
- CPC CalculatorWork out your cost per click from advertising cost and clicks.
- Conversion Rate CalculatorWork out your conversion rate from conversions and total visitors.
- Break Even CalculatorWork out how many units you need to sell to cover your fixed costs.
- Discount CalculatorWork out the discount amount and final price from a percentage off.
Employment & Salary
- Pro Rata Salary CalculatorWork out a part-time salary from the full-time salary and hours.
- Maternity Pay CalculatorEstimate your Statutory Maternity Pay week by week and in total.
- Holiday Entitlement CalculatorWork out your statutory holiday entitlement in days.
- Redundancy Pay CalculatorEstimate your statutory redundancy payment.
- Sick Pay CalculatorEstimate your Statutory Sick Pay for a period off work.
- Salary Increase CalculatorWork out the percentage increase between your old and new salary.
- Pay Rise CalculatorSee your new salary after a percentage pay rise.
- Commission CalculatorWork out commission earned on a sale.
- Salary Sacrifice CalculatorSee your salary after a sacrifice and the National Insurance saved.
- National Insurance CalculatorEstimate the employee National Insurance you pay on your salary.
Tax
Time & Work
- Working Days CalculatorCount the Monday to Friday working days between two dates.
- Business Days CalculatorAdd or subtract business days from a date, skipping weekends.
- Overtime CalculatorWork out your overtime pay from your hourly rate, overtime hours and multiplier.
- Hourly to Salary CalculatorConvert an hourly rate into an annual salary.
- Hours CalculatorWork out the hours and minutes between a start time and an end time.
Money
- Mortgage Overpayment CalculatorSee how much interest and time you could save by overpaying your mortgage each month.
- Loan Overpayment CalculatorSee how much interest and time you could save by overpaying your loan each month.
- Savings CalculatorWork out what your savings could grow to with regular monthly contributions.
- Compound Interest CalculatorWork out what a lump sum grows to with compound interest.
- VAT CalculatorAdd VAT to a price or remove VAT from a VAT-inclusive price.
- Credit Card Repayment CalculatorSee how long it takes to clear a card balance and what it costs.
- Rental Yield CalculatorWork out the gross rental yield on a property.
- Rent Affordability CalculatorSee roughly how much rent your income supports.
- Buy to Let CalculatorWork out the loan, monthly interest and yield on a buy to let.
- Conveyancing CalculatorAdd up a conveyancing quote including VAT and disbursements.
- Moving Cost CalculatorAdd up the total cost of moving house.
- Self Storage CalculatorEstimate the storage space your belongings need.
Motoring
- Fuel Cost CalculatorWork out how much fuel a journey will use and what it will cost.
- MPG CalculatorWork out your car's miles per gallon from the miles driven and litres used.
- Miles to KM CalculatorConvert miles into kilometres.
- KM to Miles CalculatorConvert kilometres into miles.
- Mileage CalculatorAdd up your total mileage and what it is worth.
- PCP CalculatorEstimate monthly payments on a PCP car finance deal.
- Car Finance CalculatorEstimate monthly repayments on a car loan.
- EV Charging Cost CalculatorWork out what it costs to charge your electric car.
Home & Energy
- U Value CalculatorWork out the U value of a wall or roof build-up from its layers.
- Heat Loss CalculatorEstimate the fabric heat loss from a room.
- Radiator Size CalculatorEstimate the radiator output a room needs in watts and BTU.
- Boiler Size CalculatorEstimate the boiler output your home needs in kW.
- Electricity Cost CalculatorWork out what an appliance costs to run.
- Solar Panel CalculatorEstimate how much electricity a solar system generates and saves.
- BTU CalculatorEstimate the heat output a room needs in BTU and watts.
- Voltage Drop CalculatorWork out the voltage drop along a cable run.
- Watts to Amps CalculatorConvert watts to amps at a given voltage.
- Amps to Watts CalculatorConvert amps to watts at a given voltage.
- Underfloor Heating CalculatorEstimate the underfloor heating output a room needs.
General
- Average CalculatorWork out the average (arithmetic mean) of a list of numbers.
- Square Metre CalculatorWork out the area of a space in square metres.
- Percentage Difference CalculatorWork out the percentage difference between two numbers.
- Pythagoras CalculatorFind the missing side of a right angled triangle.
- Mean CalculatorWork out the mean of a list of numbers.
- Bra Size CalculatorEstimate your UK bra size from two measurements.
- Aspect Ratio CalculatorWork out the aspect ratio of a width and height.
- Dog Age CalculatorConvert your dog's age into human years.
- UCAS Points CalculatorAdd up your UCAS Tariff points from your grades.
- Maximum Heart Rate CalculatorEstimate your maximum heart rate from your age.
- Speed Distance Time CalculatorEnter any two of speed, distance and time to find the third.