Home & Construction39 tools
Plan materials, dimensions, and costs for practical projects.
120+ free calculators with clear methods
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Scientific calculator
DEG: trigonometric inputs use degrees; for example, sin(30) = 0.5.
Expression—
Keyboard ready: numbers, operators, Enter, Backspace and Escape.
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A clear path to every tool
Open a collection or jump straight into one of its most-used calculators.
Time, Date & Work9 tools
Calculate dates, durations, schedules, hours, and pay.
Consumer Finance18 tools
Understand loans, savings, interest, and everyday money decisions.
Health & Fitness44 tools
Estimate body metrics, daily energy, nutrition targets, running, training, heart-rate zones, and movement.
Everyday Calculators10 tools
Convert units and plan shopping, tax, travel, energy, tips, and shared costs.
Popular calculators
Useful tools, one click away
Start with frequently used calculators across every SuCalc collection.
Area Calculator
Calculate the area of a rectangle from its length and width, then convert the result between metric and imperial area units.
Mortgage Calculator
Estimate fixed-rate principal and interest plus property tax, insurance, mortgage insurance, association dues, and extra principal.
Age Calculator
Calculate exact age in calendar years, months, and days, plus completed months, weeks, days, hours, birth weekday, and the next birthday.
Percentage Calculator
Calculate a percentage of a number, find one value as a percentage of another, measure percentage change, or adjust a value by a percentage.
Concrete Calculator
Estimate concrete for slabs, strip footings, cylindrical columns, post holes, or a combined project with multiple areas.
Unit Converter
Convert length, area, volume, mass, temperature, and speed with explicit units and adjustable display precision.
Results you can inspect
More than a number on the screen
Transparent methods
See the formula, calculation steps, units, and assumptions behind the answer.
Useful results
Breakdowns, comparisons, warnings, and tables are part of the result when they add value.
Easy to revisit
Save inputs in a shareable URL without creating an account.