Margin Calculator
How much margin is your shop leaving on the floor?
A 90-second, no-signup calculator that quantifies the three things custom shops most often get wrong: wastage, quote time, and below-target work. Plug in your numbers, see the gap.
1TradePick yours
2VolumeJobs / month
3WastageCurrent vs real
4RecoveryAnnual rand
Calculator
Plug in your numbers.
Sliders update the result live. No data leaves your browser.
Estimated annual recovery with SlabrR 1 120 800
- Wastage recovery8% wastage gap × material spendR 734 400
- Estimator time saved288 hrs/yr × R350/hrR 100 800
- Margin protection28% margin defended on ~5% of jobsR 285 600
You're applying 10% wastage but Joinery / Timber typically runs at 18%. That gap is showing up as missing material in real jobs.
Estimate based on internal benchmarks across joinery, stone, metal, glass and fit-out customers. Your actuals will differ — but the direction holds. Inputs are not stored.
How it works
Four inputs, three recovery buckets.
Tell us volume and average job
Two sliders — jobs per month, average job value. We calculate the rest.Set your wastage and margin
What you currently apply, and your target margin. The calculator finds the gap.See annual recovery
Three buckets: wastage, time saved on quotes, margin protection on below-target jobs.Why we built it
Operator honesty, not a sales calculator.
Three real margin levers
Wastage gap, estimator time and below-target jobs — the three places custom shops lose margin most consistently. Calculator quantifies each.Inputs stay local
Nothing is sent to a server. The numbers run in your browser. Use it on a sensitive job, share results with your team, no signup required.Honest assumptions
We use industry benchmarks for trade-specific wastage rates and conservative assumptions on time saved. Your real numbers will differ.Ready to actually recover this?
The calculator says the gap exists. Slabr is how you close it — accurate quotes, real wastage rules, margin protection per job.