Calculate everyday percentages
Use percentage and BMI calculators with unit conversions for quick estimates.
Free Everyday Maths Tools
Use percentage, BMI, unit, speed, storage, and distance calculators for quick everyday math.
Press Enter to view results
Popular workflows
Convert and compare quantities
Convert speed, distance, and storage values for planning and documentation.
Prepare quick calculators
Combine existing calculators for lightweight everyday workflows.
Common tasks
- Calculate percent change.
- Estimate BMI.
- Convert common units.
- Estimate distance or storage values.
All tools in this topic
Percentage Calculator Calculate percentages, percent change, and what percent one number is of another BMI Calculator Calculate body mass index from metric or US height and weight inputs Unit Converter Convert common metric and imperial units in one browser-local calculator Speed Converter Convert mph, km/h, m/s, knots, and feet per second HDD Capacity Calculator Convert advertised disk capacity to usable GiB and TiB estimates Geographic Distance Calculator Calculate great-circle distance between two latitude and longitude pairs ROI Calculator Calculate return on investment from gain and cost values CAGR Calculator Calculate compound annual growth rate locally Break Even Calculator Calculate break-even units from fixed cost, price, and variable cost Margin Markup Calculator Calculate margin and markup from cost and price locally GPA Calculator Calculate simple grade point averages locally Grade Percentage Calculator Calculate grade percentages from score and total values
Frequently asked questions
Are maths tools free?
Yes. These calculators are free and browser-local.
Can I combine calculators?
Yes. Topic links help you move between related calculators.
Are inputs saved?
No. Calculations happen in the browser.
Can I calculate storage and distance?
Yes. P2a adds HDD capacity and geographic distance calculators.