Tip Calculator
A free tip calculator that runs in your browser — see the formula, a worked example, and what changes the result most.
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Calculators
Fast, private, browser-based calculators for everyday percentages, dates, time, costs, conversions, and planning estimates.
These calculators run in the browser and do not require an account. Inputs are not intentionally stored or sent to a site database.
Results are estimates based on the values and assumptions entered. Review the explanation on each page and verify important decisions with official figures.
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Free percentage calculator with the three core formulas: X% of Y, what percent X is of Y, and percent change. Worked examples and instant results. No login.
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A free age calculator that runs in your browser — see the formula, a worked example, and what changes the result most.
Open resourceDate Difference Calculator
A free date difference calculator that runs in your browser — see the formula, a worked example, and what changes the result most.
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A free time duration calculator that runs in your browser — see the formula, a worked example, and what changes the result most.
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A free budget split calculator that runs in your browser — see the formula, a worked example, and what changes the result most.
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Tip Calculator
A free tip calculator that runs in your browser — see the formula, a worked example, and what changes the result most.
Open resourcePercentage Calculator
Free percentage calculator with the three core formulas: X% of Y, what percent X is of Y, and percent change. Worked examples and instant results. No login.
Open resourceAge Calculator
A free age calculator that runs in your browser — see the formula, a worked example, and what changes the result most.
Open resourceDate Difference Calculator
A free date difference calculator that runs in your browser — see the formula, a worked example, and what changes the result most.
Open resourceTime Duration Calculator
A free time duration calculator that runs in your browser — see the formula, a worked example, and what changes the result most.
Open resourceUnit Converter
A free unit converter that runs in your browser — see the formula, a worked example, and what changes the result most.
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Unit Converter
A free unit converter that runs in your browser — see the formula, a worked example, and what changes the result most.
Open resourceSubscription Audit Calculator
A free subscription audit calculator that runs in your browser — see the formula, a worked example, and what changes the result most.
Open resourceSimple Tax Estimate Calculator
A free simple tax estimate calculator that runs in your browser — see the formula, a worked example, and what changes the result most.
Open resourceBill Split Calculator
A free bill split calculator that runs in your browser — see the formula, a worked example, and what changes the result most.
Open resourceLoan Payment Calculator
A free loan payment calculator that runs in your browser — see the formula, a worked example, and what changes the result most.
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How often are calculator pages reviewed?
Pages show a last-reviewed date and are revisited when instructions, products, public processes, or common user needs materially change. Readers can report a correction through the contact page.
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