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See the formula, input units and assumptions behind the result.
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Free calculators.
Clarity for life’s numbers.
Explore 1012 free online calculators for maths, money, health, dates and everyday tasks. See the formula, understand the assumptions and make the numbers your own.
1012working calculators
22curated categories
Always freeno account needed
A GOOD PLACE TO START
10 everyday essentials
FOLLOW YOUR CURIOSITY
There’s a category for that.
1012 useful tools.
Find your starting point.
110 tools
Math & percentages
Percentages, ratios, algebra and the numbers you meet every day.
↗77 tools
Geometry
Areas, volumes and dimensions for common shapes.
↗85 tools
Money & finance
Understand interest, borrowing and savings using your own assumptions.
↗83 tools
Business & work
Pricing, margins, productivity and practical business planning.
↗20 tools
Everyday life
Split costs, plan time and make small decisions easier.
↗64 tools
Construction & DIY
Estimate materials and measurements before your next project.
↗95 tools
Physics
Explore motion, forces, energy and the relationships behind them.
↗63 tools
Electrical
Calculate ideal circuit relationships and electrical energy.
↗45 tools
Chemistry
Moles, concentrations and ideal-gas calculations with clear units.
↗25 tools
Fitness & sport
Training pace, race times and practical activity calculations.
↗30 tools
Food & cooking
Scale recipes and compare portions, costs and kitchen quantities.
↗20 tools
Travel & motoring
Plan journey time, fuel use and travel budgets.
↗45 tools
Statistics
Summaries, probabilities and common data relationships.
↗32 tools
Energy & environment
Explore consumption and emissions with transparent assumptions.
↗38 tools
Unit converters
Convert common measurements using published unit definitions.
↗40 tools
Computing & digital
Plan digital storage, media sizes, screens and network capacity.
↗20 tools
Astronomy & space
Explore ideal orbits, observing equipment and astronomical scales.
↗16 tools
Education & study
Understand grades, course targets and practical study planning.
↗25 tools
Date & time
Calculate ages, calendar intervals, business days and clock durations.
↗9 tools
Health & wellbeing
Explore adult body and energy estimates, cycle calendars and pregnancy date calculations with clear limitations.
↗40 tools
Engineering & manufacturing
Estimate machining, materials, manufacturing and ideal engineering relationships.
↗30 tools
Garden & agriculture
Plan planting, irrigation, yield and land-based resource quantities.
↗A real example to follow
Every calculator includes an illustrative worked example you can check.
Your inputs stay with you
Calculations run in your browser. No registration, uploads or account needed.