Everyday & Business Calculator Hub
General-purpose calculators for shopping, restaurants, work, marketing and small-business planning. The formulas are visible, and entered values remain in your browser.
🔒 Processing happens locally in your browser. Files and entered values are not uploaded.
Tools in this toolkit
23 tools Age Calculator Calculate your exact age in years, months, days — even hours, minutes and seconds. Next-birthday countdown included. Free, instant, private. Percentage Calculator Three percentage calculators in one: X% of a number, one number as a percent of another, and percentage increase or decrease. Instant, client-side. GPA Calculator Calculate your semester or cumulative GPA on the 4.0 scale. Letter or percentage grades, weighted by credits — instant and private. Reading Time Calculator Convert word counts into reading and speaking time. Adjustable speed, sentences and paragraphs included — instant and private. Invoice Generator Create a professional invoice with line items, tax and totals, then download it as a clean PDF. No signup, no watermark — built in your browser. Percentage Change Calculator Use this percentage change calculator with a clear formula, worked example and instant results. Values stay in your browser and are not uploaded. Percentage Increase Calculator Use this percentage increase calculator with a clear formula, worked example and instant results. Values stay in your browser and are not uploaded. Discount Calculator Use this discount calculator with a clear formula, worked example and instant results. Values stay in your browser and are not uploaded. Tip Calculator Use this tip calculator with a clear formula, worked example and instant results. Values stay in your browser and are not uploaded. Margin Calculator Use this margin calculator with a clear formula, worked example and instant results. Values stay in your browser and are not uploaded. Markup Calculator Use this markup calculator with a clear formula, worked example and instant results. Values stay in your browser and are not uploaded. Profit Calculator Use this profit calculator with a clear formula, worked example and instant results. Values stay in your browser and are not uploaded. Break-even Calculator Use this break-even calculator with a clear formula, worked example and instant results. Values stay in your browser and are not uploaded. ROI Calculator Use this roi calculator with a clear formula, worked example and instant results. Values stay in your browser and are not uploaded. ROAS Calculator Use this roas calculator with a clear formula, worked example and instant results. Values stay in your browser and are not uploaded. CPA Calculator Use this cpa calculator with a clear formula, worked example and instant results. Values stay in your browser and are not uploaded. CAC Calculator Use this cac calculator with a clear formula, worked example and instant results. Values stay in your browser and are not uploaded. Conversion Rate Calculator Use this conversion rate calculator with a clear formula, worked example and instant results. Values stay in your browser and are not uploaded. CPM Calculator Use this cpm calculator with a clear formula, worked example and instant results. Values stay in your browser and are not uploaded. Hourly to Annual Salary Calculator Use this hourly to annual salary calculator with a clear formula, worked example and instant results. Values stay in your browser and are not uploaded. Annual Salary to Hourly Calculator Use this annual salary to hourly calculator with a clear formula, worked example and instant results. Values stay in your browser and are not uploaded. Ratio Calculator Use this ratio calculator with a clear formula, worked example and instant results. Values stay in your browser and are not uploaded. Weighted Average Calculator Use this weighted average calculator with a clear formula, worked example and instant results. Values stay in your browser and are not uploaded.
Private by design
The page loads the tool engine in your browser. The site does not need a file-processing API, redirect database or account system to produce the result.