Math calculators
From percentages to scientific expressions — free math calculators that update as you type. Solve everyday questions like discounts, tips and ratios without signing up.
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Related guides
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How to Calculate Sales Tax
Compute sales tax forward from a price, or reverse it out of a receipt total, with the formula and worked examples.
mathHow to Calculate Percentage Increase
The percent change formula with worked examples for increases and decreases, plus the percentage-points trap that catches everyone.
mathHow to Calculate Percentage
The percentage formula explained step by step, with shortcuts and worked examples for discounts, scores and everyday percent questions.
