Free Online Calculators
Finance, math, health, construction, and everyday tools in one searchable catalog.
Your calculators
Area Calculator — Square Feet, Shapes, Rooms & Land
Calculate square footage for shapes, rooms, walls, roofs, and irregular land; include cutouts, waste, packages, cost, formulas, and diagrams.
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Alcohol Dilution Calculator — Blend ABV & Convert Proof
Dilute alcohol with water, blend two strengths, plan a target batch, or convert ABV and U.S. proof with formulas, tables, and a visual mixture breakdown.
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Volume Calculator — Cubic Feet, Gallons, Tanks & Materials
Calculate solid volume, tank and pool capacity, project material quantities, package cost, or a missing dimension with formulas, tables, and diagrams.
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Grade Calculator — Weighted Grades, Final Exam & GPA
Calculate weighted course grades, final exam targets, semester and cumulative GPA, or the GPA needed to reach a goal.
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Age Calculator — Exact Age, Days & Next Birthday
Calculate exact calendar age in years, months and days, total elapsed days, hours and minutes, age on any date, and the next birthday.
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Free Date Calculator — Days Between Dates & Age Calculator
Calculate days between dates, add or subtract days, or find an exact age with weekend controls, clear steps, and instant visual results.
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Time Calculator — Hours, Duration & Timesheet
Add or subtract time, find hours between clocks, total timesheet shifts and pay, or convert duration units with clear visual results.
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Tip Calculator — Tax, Split Bill & Custom Shares
Calculate restaurant tips before or after tax, split the bill equally or by custom shares, round the total, and see exactly what each person pays.
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