Standard Deviation Calculator (Steps, Mean & Variance)
Free standard deviation calculator with steps. Find sample or population SD, mean, and variance instantly. See the full worked solution for any data set.
Math Calculators
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Health Calculators
One Rep Max Calculator: 1RM Chart & Percentages
Free one rep max calculator estimates your 1RM from reps and weight using 4 proven formulas. Includes the 1RM percentage chart and rep max conversion table.
Other Calculators
Asphalt Calculator: Tonnage, Volume & Cost Estimator
Free asphalt calculator. Enter length, width, and thickness to get exact tonnage, cubic yards, and cost. See how much asphalt you need in seconds.
Other Calculators
Sobriety Calculator: Days Sober & Milestone Counter
Free sobriety calculator. Enter your sober date to see exact days, months, and years sober, your next milestone, and money saved. One day at a time.
Finance Calculators
PayPal Fee Calculator: Goods & Services + Net Payout
PayPal fee calculator for Goods & Services fees and your exact net payout. Reverse mode shows what to charge to receive a set amount. 2026 US rates.
Other Calculators
Voltage Drop Calculator: Formula, Chart & 3-Phase
Free voltage drop calculator for single and three-phase circuits. Get exact volts, percent drop, and wire resistance, plus the formula and AWG drop chart.
Math Calculators
Sig Fig Calculator: Count & Round Significant Figures
Free sig fig calculator counts significant figures, rounds to any number of sig figs, and solves multiplication and addition with correct rounding. See steps.