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🔬 ScienceFree
Most probable number (MPN)
Turn a row of positive and negative tubes into a density: a 5-3-1 result from three dilutions of 5 tubes each becomes an MPN per 100 mL, with the classic Thomas…
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🔬 ScienceFree
DNA Nanograms to Copies Calculator by Base-Pair Length
Know how many molecules sit in your tube: 10 ng of a 3000 bp double-stranded DNA is about 3.04148523 billion copies, using 660 g per mole per base pair and the…
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🔬 ScienceFree
DNA concentration from A260 calculator for DNA and RNA
Turn a spectrophotometer reading into a concentration you can pipette from: an A260 of 0.25 for double-stranded DNA diluted 20 times is 250 µg/mL, the same as…
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🔬 ScienceFree
OD600 to CFU calculator
Turn a spectrophotometer reading into a viable cell estimate: an OD600 of 0.5 with a factor of 8 × 10⁸ CFU/mL per OD unit gives 4 × 10⁸ CFU/mL.
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🔬 ScienceFree
Oligo nmol to µg calculator
Convert an oligo's nanomole yield into micrograms from its real base composition: 1 nmol of the DNA oligo ATCG, with a molecular weight of 1252.81 g/mol, is…
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🔬 ScienceFree
Pasture carrying capacity calculator
Budget the grass before you stock it: 120 acres yielding 2,500 lb of dry matter per acre, at 30% utilization, feed 28 whole animals eating 26 lb a day for 120…
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🔬 ScienceFree
Pedigree combined probability calculator
When more than one parental pairing can lead to the same offspring outcome, the routes are added correctly: 0.5 × 0.4 × 0.25 gives 0.05, a second route adds…
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🔬 ScienceFree
Petersen–Chapman population estimate
Mark 200 animals, catch 150 later and find 20 with marks: the classic Petersen ratio says 1500, while the Chapman adjustment gives a slightly lower, less biased…
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🔬 ScienceFree
Pond Fish Biomass Calculator
Know how much fish your pond holds: 2,500 fish averaging 0.45 kg each weigh 1,125 kg in total, the starting point for feeding plans, stocking reviews and…
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🔬 ScienceFree
Population density calculator for habitat area or volume
Turn a field count into a density you can report: 240 individuals in 12 square kilometres give 20 individuals per square kilometre.
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🔬 ScienceFree
Population Exponential Growth Calculator
Project a population while resources are not yet limiting: 1200 individuals at a continuous rate of 0.03 per year for 10 years grow by a factor of 1.349859, a…
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🔬 ScienceFree
Population percent change calculator
Compare two censuses in one step: a town that grew from 10,000 to 12,500 residents gained 2,500 people, a 25% increase.
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🔬 ScienceFree
PPM solution preparation calculator
Weigh the right amount of solute: 2 L of a 250 PPM solution with the default density of 1 kg/L needs 500 mg, or 0.5 g.
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🔬 ScienceFree
Probability all offspring are the same sex calculator
In a family of 4, the chance that all children share one sex is 2 in 16, or 12.5%, because all of one sex and all of the other both count.
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🔬 ScienceFree
Protein net charge calculator
See how charged your peptide is at a given pH: at pH 7.4, a peptide with 3 lysines, 2 arginines, 4 aspartates and 2 glutamates, among others, carries a net…
K
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🔬 ScienceFree
Probability of two recessive traits
Two AaBb parents have a 1 in 16 chance, 0.0625 or 6.25%, of an offspring that shows both recessive traits, because 1/4 at each locus multiplies to 1/16.
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🔬 ScienceFree
Protein purification calculator
Judge a purification step with two numbers: total activity falling from 12,000 to 7,800 units means 65% recovery, and specific activity rising from 2.5 to 18.75…
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🔬 ScienceFree
Recombination Frequency Calculator for Two-Point Crosses
Enter 184 recombinant offspring out of 1000 scored and the recombination frequency is 18.4 %, with the 816 non-recombinants shown alongside, so a two-point…
K
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🔬 ScienceFree
Rule of 70 Population Calculator
A population growing 2 % a year doubles in about 35 years: the rule of 70 turns a constant annual growth rate into a doubling time for lessons, community…
K
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🔬 ScienceFree
Secondary Production Calculator for Population Biomass
With 120 units of biomass from growth and 30 from reproduction over an interval of 12, secondary production is 150 and the rate 12.5 per time unit, split 80 %…
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🔬 ScienceFree
Seeding rate from spacing calculator
Rows 75 cm apart, hills every 25 cm and 2 seeds per hill need 106667 seeds per hectare: the calculator turns a field layout into a seed quantity for buying seed…
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🔬 ScienceFree
Simpson index calculator
Four species with 10, 20, 5 and 15 individuals give lambda 0.3 and a Gini–Simpson diversity of 0.7: enter your counts and get Simpson's D, its complement…
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🔬 ScienceFree
Single-tube dilution factor calculator
Bring 0.25 mL of sample to 5 mL total and the dilution factor is 20: the calculator also gives the 4.75 mL of diluent to add and the 0.05 sample fraction, one…
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🔬 ScienceFree
Species Richness Count Calculator
Six observations of Oak, Pine, Oak, Birch, pine and Willow give a species richness of 4: paste your list and the calculator removes repeats, ignores…
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🔬 ScienceFree
Specific growth rate mu calculator
Biomass rising from 0.12 to 0.48 in 3 hours is a fourfold increase: 2 generations with a doubling time of 1.5 hours.
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🔬 ScienceFree
Thermal z-value calculator
If D drops from 5 to 0.5 when the process temperature rises from 110 to 120 °C, the z-value is 10: enter two temperature and D pairs to get z for lethality…
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🔬 ScienceFree
Total Row Length Calculator
2.5 hectares planted at 0.75 m between rows hold 33.333 kilometres of crop row: the calculator divides the planted area by the row spacing so you can size seed…
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🔬 ScienceFree
Trophic energy transfer calculator
If producers store 10000 kcal, only 1000 reach the herbivores at the classic 10 % efficiency: the calculator multiplies energy by the transfer fraction for each…
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🔬 ScienceFree
Two-trait combined probability calculator
A 0.75 chance for one trait and 0.25 for another give a 0.1875 chance, or 18.75 %, that the same offspring shows both: the calculator applies the product rule…
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🔬 ScienceFree
Weaning Weight Ratio Calculator for Contemporary Groups
Shows how one young animal measures up to its group: at 268 against a group average of 249, the ratio is 107.63 and it ranks first of 5.
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🔬 ScienceFree
Y-Linked Inheritance Probability Calculator for Sons and Daughters
Shows how a Y-chromosome trait travels: an affected father passes it to 100% of his biological sons and 0% of his daughters, because daughters receive his X…
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💰 Finance & moneyFree
Agenda end time calculator
A meeting that starts at 09:30 with items of 10, 45 and 20 minutes ends at 10:45, after 75 minutes.
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💰 Finance & moneyFree
Attendee hourly cost calculator
A 40-hour week over 52 weeks gives 2080 paid hours, and a multiplier of 1.3 adds 30% overhead on top of the base hourly cost.
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💰 Finance & moneyFree
Backlog completion sprint count calculator
A backlog of 145 story points at 32 points per sprint needs 5 whole sprints; starting at sprint 12, work should finish in sprint 16, which carries the last 17…
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💰 Finance & moneyFree
Context switching time loss calculator
Twelve interruptions a day with 23 minutes to refocus after each cost 276 minutes, or 4.6 hours, every day; over a 48-week year that adds up to 1104 hours.
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💰 Finance & moneyFree
Eat the frog order
Score Draft annual report at 9, Prepare board slides at 7 and Reply to routine emails at 2, and the report comes first as your frog while the emails go last.
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💰 Finance & moneyFree
Eisenhower priority classifier
A task that is both urgent and important, such as fixing a production outage, lands in quadrant 1: do it first.
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💰 Finance & moneyFree
FTE headcount calculator
Ana on 40 hours, Ben on 20 and Cara on 30 add up to 2.25 full-time equivalents against a 40-hour week, not three.
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💰 Finance & moneyFree
Gantt chart bar duration calculator
A Gantt bar from Monday 8 January to Friday 19 January 2024 lasts 12 calendar days or 10 working days, with both ends counted.
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💰 Finance & moneyFree
Goal completion date calculator
With 750 left on a goal of 1,000 and steady progress of 25 a day, you finish in 30 days: starting on 1 January 2024, that is 31 January.
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💰 Finance & moneyFree
66-Day Habit Target Date Calculator
Start a new routine on 1 January 2026 and your 66-day milestone falls on 8 March 2026. Weekends, month lengths and leap years are handled for you, giving a…
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💰 Finance & moneyFree
Inbox zero processing time calculator
Clearing 240 emails at 1.5 minutes each takes 360 minutes: 6 hours, or 0.75 of an eight-hour workday.
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💰 Finance & moneyFree
Meeting cost per minute calculator for teams
8 people at an average hourly wage of 75 cost 10 for every minute the meeting runs, or 600 an hour.
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💰 Finance & moneyFree
Person-hours effort calculator for project labor
6 people working 37.5 hours each put 225 person-hours into a project, and at a rate of 48.75 that is a labor cost of 10,968.75.
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💰 Finance & moneyFree
Pomodoro Total Break Time Calculator
8 Pomodoros leave 7 breaks: 6 short ones totaling 30 minutes and 1 long break of 15, so 45 minutes of rest in the plan.
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💰 Finance & moneyFree
Rotating meeting facilitator calculator
With Alice, Bob, Carol and Dana on the list, the first meeting (number 0) goes to Alice, Bob is next and Dana went before; after Dana the cycle starts again.
S
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💰 Finance & moneyFree
Rotating shift schedule planner
A four-on, four-off cycle from 1 to 16 January 2026 gives 8 working days, 1 to 4 and 9 to 12 January, and 8 rest days.
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💰 Finance & moneyFree
Schedule variance calculator
Earned value of 45,000 against planned value of 50,000 gives a schedule variance of −5,000 and an SPI of 0.9: the project is behind.
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💰 Finance & moneyFree
Tasks per day target calculator
47 tasks in 6 working days means a target of 8 a day: five days of 8 and one day of 7 finish the list exactly, with no task left over.
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💰 Finance & moneyFree
Team sprint capacity calculator
Five people over 10 working days at 8 hours a day with a 0.7 focus factor have 400 gross hours and 280 hours of real sprint capacity; the other 120 go to…
S
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💰 Finance & moneyFree
Time Blocks per Day Calculator
A 480-minute workday with 60 minutes of breaks leaves 420 for focus: 8 complete blocks of 50 minutes, with 20 minutes left over that never pass for a ninth.
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💰 Finance & moneyFree
Timebox end time calculator
A 90-minute block starting at 23:30 hard-stops at 01:00 the next day, and a 30-minute buffer moves the next block to 01:30.
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💰 Finance & moneyFree
Two-minute rule task counter
Eight tasks of 0.5, 1, 2, 5, 15, 1.5, 30 and 2 minutes hold five quick wins worth 7 minutes, while three deferred tasks take 50.
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📅 Dates & timeFree
Age in years, months and days calculator
Get an exact age in whole years, months and days between a birth date and a day you choose: someone born on 15 May 1990 is 36 years, 2 months and 10 days old on…
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📅 Dates & timeFree
Age in Total Seconds Calculator
Turn the span from a birth date to a reference date into one exact count of seconds: from 1 January 2000 to 1 January 2025 is 9,132 days, or 789,004,800…
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📅 Dates & timeFree
Which anniversary number calculator
Find which anniversary a given day marks: someone hired on 15 March 2014 reaches their 10th work anniversary on 15 March 2024.
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📅 Dates & timeFree
Project business days calculator
From Monday 6 July to Friday 10 July 2026 a project has 5 business days, and listing 8 July as a holiday leaves 4.
P
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📅 Dates & timeFree
Days until retirement age calculator
Born on 15 June 1965 and retiring at 65? That day is 15 June 2030, 1,403 days after 12 August 2026.
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📅 Dates & timeFree
Local time from UTC offset calculator
Turn a UTC clock time into local time for an offset you already know: 18:45 UTC at +5:45 in Kathmandu is 00:30 on the next day.
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📅 Dates & timeFree
Next birthday countdown calculator
Someone born on 20 October 1990 has 69 days to go when counting from 12 August 2026, and turns 36 that day.
K
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Receive a signed webhook the moment it's ready, or fetch a signed link. A failed task is never charged.
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The full API — 7800+ capabilities — billed only for what you run, from $0.002 per call. No monthly fee.
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