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💰 Finance & moneyFree
SS claim breakeven calculator
Claim 1,800 a month at 62 or wait for 2,400 at 70? Added up month by month, the delayed claim only overtakes the early one at about age 94.08.
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📅 Dates & timeFree
French Republican calendar
Find the Revolutionary date of any day since the calendar began: 22 September 1792 is 1 vendémiaire, Year I.
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📅 Dates & timeFree
Interval intersection
Enter two time ranges and get the part they share: 10:00 to 12:00 and 11:00 to 13:00 UTC overlap from 11:00 to 12:00, exactly one hour.
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📅 Dates & timeFree
Juche era converter
Turn a Gregorian year into a Juche year and back: 2024 is Juche 113. Enter a plain year or a full date, or start from a Juche year to get its Gregorian year.
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📅 Dates & timeFree
Julian ↔ Gregorian converter
Convert a date between the Julian and Gregorian calendars, either way round: 15 October 1582 in the Gregorian calendar is 5 October 1582 in the Julian one.
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📅 Dates & timeFree
Leap seconds UTC↔TAI
Find the gap between atomic time and UTC for any date, or list the leap seconds behind it: on 2017-01-02, TAI−UTC is 37 seconds.
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📅 Dates & timeFree
NTP ↔ Unix timestamp
Unix time 0 is NTP 2208988800: the same instant, midnight on 1 January 1970, counted from two different starting points.
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📅 Dates & timeFree
Parse relative dates
From 10 January 2020 at 12:00 UTC, the phrase in 3 days becomes 13 January 2020 at 12:00 UTC. Type a short English or Spanish phrase and a reference moment to…
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📅 Dates & timeFree
Roman Kalends/Nones/Ides
1 March 2020 is the Kalends of March in the Roman calendar, written Kalendis. Enter a modern date to see how it is named in classical Roman style, counted from…
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📅 Dates & timeFree
UUID v1/v6/v7 to timestamp
Paste a UUID of version 1, 6 or 7 and get the time stored inside it: 018bcfe5-6800-7000-8000-000000000000 holds 2023-11-14T22:13:20.000Z, or 1700000000000 Unix…
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📅 Dates & timeFree
Weekday occurrence in month
Enter a date to learn which occurrence of its weekday it is within the month and whether it is the last: 1 July 2025 is the first Tuesday of July, and not the…
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➗ MathFree
Sphere calculator
Enter a sphere's radius and get its diameter, equatorial circumference, surface area and volume at once: a radius of 1 gives a surface of 12.5663706144 and a…
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🏗️ Engineering & constructionFree
Voltage divider calculator
12 V across two 1000-ohm resistors gives 6 V at the midpoint, a ratio of 0.5 and an attenuation of −6.0205999133 dB: enter the input voltage, R₁ and R₂ to get…
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➗ MathFree
Polygon apothem calculator
Give the number of sides and one length you know, and the whole regular polygon comes back: a hexagon with sides of 2 has an apothem of 1.732051, an area of…
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💰 Finance & moneyFree
Taxable equivalent yield calculator
At a 32% marginal rate, a 3% tax-exempt yield matches a taxable yield of about 4.4118%. Convert in either direction to compare a municipal bond with a taxable…
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➗ MathFree
Abjad numeral converter free online
Alif counts as 1, ba as 2 and ghayn as 1000 in the classical Eastern abjad table. Turn a number from 1 to 1999 into letters, read letters back as a total, or…
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➗ MathFree
Age ratio calculator
If two ages are in the ratio 2:1 today and 3:2 in 5 years, they are 10 and 5 now. Enter both ratios and the gap in years to get the present and future ages for…
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➗ MathFree
Boat and stream speed calculator free online
A boat doing 10 in still water against a current of 2 moves upstream at 8 and downstream at 12. Work the classic boat-and-stream problem either way: from boat…
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➗ MathFree
CP SP MP calculator
Work through classic profit-and-loss questions: with a cost of 100, a marked price of 150 and a 10% discount, the selling price is 135 and the profit is 35, or…
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➗ MathFree
Hebrew numeral converter and gematria free
Write a whole number in Hebrew letters or read Hebrew letters back as a number: 5 becomes ה׳ with its geresh, and forty-two is mem plus bet.
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➗ MathFree
Largest remainder seat allocation free
Turn vote totals into whole seats with the largest remainder method: 416000, 338000 and 246000 votes for 10 seats under the Hare quota give 4, 3 and 3 seats.
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➗ MathFree
Maya vigesimal numeral converter free
Convert whole numbers into Maya base-twenty numerals and back, written as the plain words shell, bar and dot: 0 is a single shell, and every place from 1 to 19…
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➗ MathFree
Pie chart angles from values free online
Values 1, 1 and 2 add up to 4, so they become a quarter, a quarter and half of the circle. Enter any list of values or weights to get each slice's angle in…
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➗ MathFree
Pipes and cisterns calculator free online
Two pipes that fill a tank in 4 and 6 hours fill it together in 2.4 hours. Enter how long each inlet takes to fill the tank and each drain to empty it, and get…
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➗ MathFree
Sainte-Laguë seat allocation calculator free
With 5000, 3000 and 2000 votes and 5 seats to fill, the Sainte-Laguë method gives the three parties 3, 1 and 1 seats.
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📅 Dates & timeFree
Orthodox Christmas date
Orthodox Christmas falls on 7 January 2026, because it keeps 25 December of the Julian calendar, which runs 13 days behind.
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📅 Dates & timeFree
Victoria Day (Canada) date
Enter a year to get the date of Victoria Day in Canada, the Monday on or before 24 May: in 2026 it falls on 18 May.
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📅 Dates & timeFree
Week of month calculator
Enter a date to find which week of its month it falls in: 25 July 2026 is in week 4, because the 25th divided by seven, rounded up, gives 4.
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💰 Finance & moneyFree
CD early withdrawal penalty
Breaking a 10,000 CD at 4% APY with a 180-day interest penalty costs 197.26, leaving 9,802.74 if you withdraw now.
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💰 Finance & moneyFree
Lease buyout cost
Find the total cash to buy out your lease: a residual of 18,000, a 500 purchase option fee and 8% sales tax come to 19,980, of which 1,480 is tax.
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💰 Finance & moneyFree
Mortgage offset account savings
With 20,000 in an offset account against a 200,000 mortgage at 4%, monthly interest drops from 666.67 to 600, a saving of 66.67 a month.
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💰 Finance & moneyFree
Negative equity roll-in
Trade in a car worth 12,000 while still owing 15,000 and 3,000 of negative equity moves into the new loan: on a 28,000 car you would finance 31,000.
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💰 Finance & moneyFree
Mortgage points break-even
One point on a 300,000 loan costs 3,000; if it lowers the payment from 1,800 to 1,750, the 50 saved each month repays it in 60 months, or 5 years.
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💰 Finance & moneyFree
Prepayment penalty calculator
A 2% penalty on a remaining balance of 150,000 comes to 3,000. If your contract counts the penalty in months of interest instead, enter the months and the…
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💰 Finance & moneyFree
Quarterly estimated tax
With 12,000 of estimated annual tax and nothing withheld, you owe four quarterly payments of 3,000.
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💰 Finance & moneyFree
Standard vs itemized deduction
Enter a standard deduction of 14,600 and itemized deductions of 12,000, and the calculator recommends the standard deduction, which is 2,600 larger.
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🧭 Travel & geographyFree
Gall–Peters projection calculator
On the Gall–Peters map with a radius of 1, the point at 0° latitude and 0° longitude sits at x 0 and y 0, the centre of the map.
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🧭 Travel & geographyFree
Geocentric radius calculator
At latitude 0° on WGS84, the geocentric radius is 6378137 m, the full equatorial radius. Enter a geodetic latitude and, if you like, a height above the…
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🧭 Travel & geographyFree
Vertical sextant angle distance
An object 100 metres tall seen at a vertical angle of 45° is 100 metres away. Enter the known height and the sextant angle between its top and its base, and get…
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➗ MathFree
Arithmetico-geometric series sum
With a first term of 1, a difference of 1, a ratio of 0.5 and 5 terms, the sum is 3.5625. Enter the arithmetic start and step, the geometric ratio and how many…
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➗ MathFree
Chain discount / net price factor
Turn a chain of trade discounts into one net price: a list price of 100 with twenty percent and then ten percent off comes to 72, a net price factor of 0.72…
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➗ MathFree
Hexagonal prism calculator
A hexagonal prism with a side of 2 and a height of 5 holds about 51.961524 cubic units. Enter both lengths and get the volume, the base area, the lateral area…
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➗ MathFree
Markdown percentage calculator
Turn two price tags into a markdown percentage: an item cut from 80 to 60 is 25% off, with 20 taken off.
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➗ MathFree
Motzkin number calculator
Get the Motzkin number at any position n, built by the standard recurrence from two starting terms equal to 1: position 0 gives 1, and each later term adds the…
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➗ MathFree
Power of a point calculator
Enter the distance from a point to the center of a circle and the radius, and get the power of the point, d² − R²: at a distance of 5 from a circle of radius 3…
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➗ MathFree
Regular tetrahedron calculator
A regular tetrahedron with an edge of 2 has a volume of about 0.942809 and a surface area of 6.928203.
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➗ MathFree
Roman chronogram calculator
In the phrase “aMore paVLVs” the Roman letters M, V, L and V add up to 1060. Type any phrase and the calculator finds every M, D, C, L, X, V and I, lists them…
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➗ MathFree
Square pyramid calculator
Enter the base side and height of a square pyramid and get its volume, slant height, lateral area and total surface at once: a side of 4 and a height of 3 give…
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➗ MathFree
Stair rise and run calculator
Turn a floor-to-floor height into equal steps: a total rise of 280 with a target riser of 18 gives 16 risers of exactly 17.5, 15 treads and, with treads 25…
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➗ MathFree
Tangent-secant theorem calculator
With a tangent of 6 and an outer secant part of 4, the whole secant is 9, because PT² = PA·PB and both sides give 36.
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➗ MathFree
Wastage allowance calculator
Find the quantity to order so that, after a known share is wasted, you still keep what you need: 100 units at 10% wastage means ordering 111.1111.
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➗ MathFree
Hedges g effect size
Compare two groups on a common scale: with means of 10 and 8, standard deviations of 2 and 30 people in each group, Cohen's d is 1 and Hedges' g is 0.987013…
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➗ MathFree
Matthews correlation (MCC)
With 50 true positives, 40 true negatives, 5 false positives and 5 false negatives, the Matthews correlation coefficient is 0.79798.
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🧭 Travel & geographyFree
Haversine distance - great-circle km, mi and m between two points
Get the great-circle distance between two GPS points in kilometres, miles and metres at once: from 40.7128, -74.006 to 51.5074, -0.1278 it is 5570.22218 km…
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➗ MathFree
Absolute value equation solver
For |2x − 3| = 5 the two roots are −1 and 4, found by setting the inside equal to 5 and to −5. Enter the three numbers of your equation to get its ordered…
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➗ MathFree
Finite series partial sum
Check a partial sum without adding by hand: the arithmetic sequence starting at 2 with difference 3 gives 2, 5, 8, 11 and 14 for indexes 1 to 5, a total of 40.
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➗ MathFree
2×2 system by substitution
For 2x + y equal to 5 and x − y equal to 1, isolating x gives 2.5 minus 0.5y, and substituting leads to the point (2, 1).
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🔬 ScienceFree
Kepler's third law calculator
Scale one known orbit to another: if Earth takes 1 year at 1 AU, a body at 4 AU from the Sun takes 8 years.
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🔬 ScienceFree
Physical size from angular diameter
The Moon spans 31.5 arcminutes at 384400 km, which makes it 3522.248963449756 km across. Enter any angular diameter in radians, degrees, arcminutes or…
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🔬 ScienceFree
Propellant mass fraction calculator
To gain 9400 of velocity with an exhaust velocity of 3500, 0.931827518029 of the rocket's starting mass must be propellant, a mass ratio of 14.668675264333.
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3
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