Tools
Free calculators and interactive tools from KDS London.
Curtain Fabric Calculator: How Much Fabric Do I Need?
Free curtain fabric calculator. Enter your track width, finished drop, heading style and pattern repeat to work out how many metres of fabric to buy for a pair of curtains, with an estimated cost.
Read the guideLighting Calculator: How Many Lumens and Downlights Does a Room Need?
Free lighting calculator: enter your room size and how you use it to work out the lumens you need, how many downlights to fit, and a suggested even grid layout.
Read the guideTile Calculator: How Many Tiles Do I Need, Plus Grout
Work out the tiles, boxes, adhesive and grout your room needs: enter the area, tile size and joint width, and it adds a wastage allowance for cuts.
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Interior Designer Cost Calculator: Estimate Your London Design Fee
Free interior designer cost calculator: enter your rooms, floor area and budget and see your likely design fee across hourly, day, per-room, per square metre and percentage models, with the London uplift built in.
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London Renovation Cost Calculator: Estimate Your Refurbishment Budget per m²
Free London renovation cost calculator: enter your floor area and finish level to estimate your refurbishment budget per square metre, split into build cost, design fee and contingency.
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Paint Calculator: How Much Paint Do I Need for a Room?
Free paint calculator: enter your room dimensions, number of coats and doors and windows to work out how many litres and tins of paint you need, with an estimated cost.
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Cost-Plus vs Retail: Interior Designer Procurement Markup Calculator
Compare buying furniture through your interior designer at trade price plus margin against buying it yourself at retail. See whether cost-plus procurement saves you money or adds to the bill.
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Furniture Budget Calculator: How Much to Budget for Furnishing a Room
Free furniture budget calculator: enter your rooms and total furnishing budget to see a sensible spend per room and per item, from the sofa to the bed, against realistic London price bands.
Read the guideWallpaper Calculator: How Many Rolls of Wallpaper Do I Need?
Free wallpaper calculator: enter your room size, roll dimensions and pattern repeat to work out how many rolls of wallpaper you need, plus a sensible spare, with an estimated cost.
Read the guideRug Size Calculator: What Size Rug Do I Need?
Free rug size calculator. Enter your room or furniture measurements and get the right rug dimensions for a living room, dining room or bedroom, matched to standard UK rug sizes.
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