Free Online Calculators
Finance, math, health, construction, and everyday tools in one searchable catalog.
Your calculators
Running Pace Calculator — Time, Distance & Splits
Calculate running pace, finish time, or distance with only the two values you know, then optionally build exact even or negative splits.
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Salary Calculator — Hourly to Annual Pay
Convert hourly, daily, weekly, monthly, or annual gross pay instantly. Optionally adjust schedule, unpaid time, overtime, bonus, and raise.
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Sleep Calculator — Bedtime, Wake Time & Duration
Plan bedtime from a required wake time, find a wake time from bedtime, or measure an overnight sleep window. Compare the result with CDC age guidance and optionally explore variable cycle scenarios.
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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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Water intake calculator — daily hydration range
Estimate a practical daily drinking range from weight, exercise and heat, with glasses, hourly pace and transparent adjustments.
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