Calculators
General and construction calculators with documented formulas and assumptions. Results are estimates and do not replace professional advice where noted.
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Tax & Business (7)
GST / VAT Calculator
Calculate GST, VAT, and other tax amounts with inclusive/exclusive breakdowns.
Tax Calculator
Estimate tax liability using income and a tax rate you specify.
Discount Calculator
Calculate discounted prices, savings, and final prices.
Profit Margin Calculator
Calculate profit, margin, and markup from revenue and cost.
Ratio Calculator
Simplify ratios or solve proportions.
ROI Calculator
Calculate return on investment and annualized returns.
Break-even Calculator
Find the sales volume needed to cover your business costs.