Free calculators built for welders, fabricators, and makers. Plan your gaps, cuts, material weight, and angles before you touch the grinder — then get back to building.
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GAP CALCULATOR
Space bars or slats evenly across any frame. Enter your frame size and bar width — get exact gap measurements.
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CUT LIST
Plan your cuts before ordering. Know how many lengths to buy, cuts per length, offcut sizes, and waste percentage.
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WEIGHT CALCULATOR
Calculate your total order weight before heading to the supplier. Includes a bakkie load indicator so you know what you can carry.
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ANGLE CUTS
Get short point, long point, and a cut diagram for any angle. Mark directly from the diagram — no guesswork at the grinder.
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ROD ESTIMATOR
Not sure which rod to use or how many to buy? Get a rod recommendation for your job and an accurate quantity estimate.
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R
JOB COSTING
Price your work properly. Calculate material, labour, and consumable costs — then generate a clean client quote in Rands.
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COMING SOON
BOLT SPACING
Evenly space bolts or holes along any length. Same precision as the Gap Calculator — built for drilling and fixing.
The formula
n = floor( (L + g) / (w + g) )
g_actual = (L − n×w) / (n − 1)
Bars run edge-to-edge. Gaps exist only between bars — not at the ends.
Frame Dimension (spacing direction)
Frame length — the side your bars span acrossL
mm
Bar / Slat Width
Width of each flat bar or slatw
mm
Target Gap
Gap you're aiming for between barsg
mm
Bar Cut Length (optional — for materials list)
Length to cut each bar — usually the other frame dimensionb
mm
Stock length you buy from (usually 6m)S
mm
Measure twice, cut once. Enter your raw stock length, how long you want each piece, and how many you need. GapCalc tells you cuts per length, lengths to buy, offcut lengths — before you touch the grinder.
Raw Stock
Length of each piece you buyS
mm
Desired Piece Length
Length of each piece you want to cutp
mm
Quantity Needed
Total number of pieces requiredQ
pcs
Blade Kerf (optional)
Material lost per cut (angle grinder disc ≈ 1–2mm)k
mm
Know before you go. Calculate the total weight of your steel or timber order before heading to the supplier — so you know if your bakkie can handle it.
Material
Steel Profile
Timber Species
Select species for accurate density
Custom density
g/cm³
Dimensions
Order Details
Length per pieceL
mm
Number of lengthsQ
pcs
The formula
cut face = width / sin(θ)
long point = short point + (width / tan(θ))
Bars run edge-to-edge. Mark from short point and long point — draw a line between them.
Cut Type
How are the two cuts oriented?
Material Width
Width of the face being cut acrossw
mm
Piece Length (short point to short point)
The dimension you're cutting to — measured on the short sideL
mm
Cut Angle
Angle of the cut measured from square (90° = straight cut)θ
deg
Your Skill Level
Be honest — this helps the tool give you the right guidance and a realistic quantity estimate.
PART 1 — ROD SELECTOR
Base Material
What metal are you welding?
Joint Type
How are the two pieces of metal meeting?
Weld Position
The position you will be welding in. Shown with industry code for reference.
PART 2 — ROD QUANTITY ESTIMATOR
Rod Diameter
Select the rod size you are using. If unsure, 2.5mm is a good starting point for most hobby welders.
Material Thickness
Thickness of the thinner piece being weldedt
mm
Total Weld Length
How many individual welds (joints) does this job have? Then pick the approximate size of each weld.
Number of joints
pcs
Approximate weld size per joint:
Add up the total length of all your welds combined and enter it here.
Total weld lengthW
mm
Price your work properly. Enter your materials, labour, and consumables. GapCalc calculates your cost, suggests a sell price, and generates a clean quote for your client — keeping your margins private.
Quote Details
Your business name
Client name
Quote date
VAT registered — include VAT number on quote
VAT registration number
Materials
DescriptionQtyUnit Price
Consumables
Rods, grinding discs, wire, gas, primer, paint — every small cost adds up. Don't leave money on the table.
DescriptionQtyUnit Price
Labour
Your hourly rate
R/hr
Hours on this job
hrs
Flat labour fee for this job
R
Delivery
You will deliver the finished product to the client
Distance to client
km
Fuel price
R/L
Fuel consumption
L/100km
Your time cost (hourly)
R/hr
Estimated delivery time (one way)
hrs
Margin & Pricing
Your target gross margin%
%
Markup vs Margin — know the difference
Markup is added on top of your cost. A 30% markup on R1000 = R1300 sell price. Margin is your profit as a percentage of your sell price. A 30% margin on R1000 cost = R1428 sell price. Same profit goal — different numbers. This tool uses margin.