Methodology
How Tallyard calculators work
Every Tallyard calculator follows three principles: the formula is public, the sources are cited, and the answer is shown with its supporting math.
Formulas
Each calculator's formula is displayed on the page itself. You can see the inputs, how they combine, and the result. If we apply a waste factor or a rounding rule, that factor is shown explicitly.
Sources
Coverage rates (e.g. paint coverage per gallon, mulch depth per cubic yard) come from manufacturer specifications and industry references. Each calculator page links to the sources it relies on.
Rounding
Results are rounded up to practical purchase units — you can't buy 2.67 gallons of paint, so we show 2.8. The raw number is shown alongside for reference.
What we don't do
Tallyard calculators provide material estimates, not engineering specifications. For structural work, permitting, or anything safety-critical, consult a licensed professional.