Get the numbers right
Online calculators
Type a calculation, change a number and get an answer you can use.
/
Search by tool or task. Use ↓ to choose, Enter to open.
Browse by task
Even eight arms couldn’t find that.
Try a shorter name, like “text”, “color” or “code”.
- 30 60 90 triangle calculatorA 30–60–90 triangle has side ratios 1 : √3 : 2.
- 3D model scale calculatorFind the percentage scale setting needed to change a model dimension to your target size.
- 3D print filament cost calculatorAdd filament mass cost, electricity and your other per-job costs before pricing a print.
- 45 45 90 triangle calculatorA 45–45–90 triangle has two equal legs and a hypotenuse equal to either leg × √2.
- A/B test calculatorCompare two independent conversion rates using a pooled two-proportion z statistic and two-sided approximate p-value.
- AbacusExplore a five-column decimal abacus by setting a value or moving the upper and lower bead groups.
- Acceleration calculatorAverage acceleration = (final velocity − initial velocity) ÷ elapsed time.
- Acreage calculatorConvert a rectangular plot’s dimensions in feet to acres: acres = length × width ÷ 43,560.
- Ad metrics calculatorCalculate CPM, CPC, click-through rate, and cost per conversion from a single advertising funnel.
- Algebra calculatorSolve a × x + b = c and check the substitution.
- Amortization calculatorCalculate a level loan payment, month-by-month principal and interest, and the effect of an extra monthly payment.
- Angle between two vectors calculatorThe angle is arccos of the dot product divided by both vector magnitudes.
- Angle of elevation calculatorFind the angle above horizontal from a vertical rise and a horizontal distance: angle = atan(rise ÷ distance).
- Angular acceleration calculatorAverage angular acceleration = (final angular velocity − initial angular velocity) ÷ elapsed time.
- Angular velocity calculatorAngular velocity is angular displacement divided by elapsed time.
- Annual income calculatorAnnual gross income = hourly rate × paid hours per week × paid weeks per year.
- Annuity calculatorValue a stream of equal payments with end-of-period or beginning-of-period timing.
- Annuity payout calculatorCalculate equal month-end withdrawals that exhaust a balance over a chosen number of months at a constant return.
- Appreciation calculatorProjected value = starting value × (1 + annual change rate) raised to the number of years.
- Aquarium tank weight calculatorAdd water mass to the tank, substrate and equipment for a filled-system estimate.
- Arc length calculatorArc length = radius × central angle in radians. Sector area = radius² × angle in radians ÷ 2.
- Area calculatorAdd areas of rectangular, circular and triangular parts to measure a compound surface.
- Aspect ratio calculatorResize dimensions without stretching: target height = target width × original height ÷ original width.
- Atoms to moles calculatorConvert a count of atoms or molecules to moles using n = particles/Nₐ.
- Auto loan calculatorInclude the down payment, trade equity and financed costs.
- Average rate of change calculatorAverage rate of change = (second y − first y) ÷ (second x − first x).
- Average return calculatorCompare the arithmetic mean of periodic returns with their compound, geometric return.
- Average velocity calculatorAverage velocity = signed displacement ÷ elapsed time.
- Baluster calculatorFit equal-width balusters with equal gaps at both ends: n = ceiling((span − maximum gap)/(width + maximum gap)).
- Bandwidth calculatorMultiply concurrent streams by each stream’s bitrate, then add your overhead allowance.
- Basic calculatorAdd, subtract, multiply and divide with parentheses, percentages and memory. Type, paste or use the keypad, then copy your answer.
- Basis point calculatorOne basis point equals one hundredth of a percentage point. Divide basis points by 100.
- Battery life calculatorRun time = usable stored energy × delivery efficiency ÷ constant load power.
- Bayes theorem calculatorUpdate a prior probability with the likelihood of an observation under an event and its complement.
- Big number calculatorAdd, subtract and multiply large decimals exactly, or divide them as a reduced exact fraction.
- Bill splitterSplit a bill equally in hundredths, allocating leftover cents to the number of people shown.
