Free tool for builders & estimators
Sealant Quantity Calculator
How many cartridges or sausages does the job need? Enter the joint size and lineal metres — the calculator includes 10% wastage. Handy for estimating; for a full priced scope, get a quote.
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How the maths works
Sealant volume per metre of joint = width (mm) × depth (mm) millilitres. A 10 × 10 mm joint uses 100 ml per metre, so a 300 ml cartridge runs about 3 lineal metres and a 600 ml sausage about 6. We add 10% for wastage — tooling losses, joint variation and part-used tubes.
Rule of thumb for depth: for joints wider than 10 mm, sealant depth should be roughly half the width (a 20 mm joint wants ~10 mm depth over backer rod). Correct depth is set with backer rod — deep-filled joints without it fail early. More in our guide: what a good panel joint looks like.
Estimating a real job — precast panels, fire rated joints, floor joints? Send the metres through the quote form and we'll price the whole thing, materials and labour, free.