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Calculators that show their working.
Roofing and decking numbers, marketplace fees and creator payouts. Enter your figures, get the answer and see exactly how it was worked out.
Home & Trade
Home & Trade Calculators
Material quantities and measurements for roofing, decking, concrete, fencing and paint.
Roof pitch calculator
Pitch, angle, slope and rafter multiplier from rise and run.Deck material calculator
Boards, joists, screws and a shopping list for any deck size.Roof pitch chart
Printable chart of pitches 1/12 to 24/12 with angles, multipliers and hip factors.Rafter length calculator
Rafter length from run, pitch and overhang.Roofing squares calculator
Roof area and squares of material from footprint and pitch.Concrete slab calculator
Cubic yards and bags for slabs and footings.Coming soonFence calculator
Posts, rails and pickets for a fence run.Coming soonPaint calculator
Paint needed per room, minus doors and windows.Coming soon
Seller Fees
Seller Fee Calculators
See what each marketplace takes and what you actually keep on a sale.
Marketplace fee comparison
The same sale on Etsy, eBay and Shopify, side by side.Etsy fee calculator
Listing, transaction and processing fees, plus reverse pricing.eBay fee calculator
Final value fees and payout per sale.Shopify fee calculator
Plan and payment fees per order.Amazon FBA calculator
Referral and fulfilment fees against your margin.Coming soon
Creator Tools
Creator Payout Calculators
Turn bits and subs into the money that actually reaches you.
How we build every calculator
Each tool shows the formula it uses with your numbers filled in, a worked example, and the source for any fee or rate. Fee tables are checked against the platform's own published rates and the check date is printed on the page. More about how we work.
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