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🔬 ScienceFree
Bacteria growth calculator
Find how many bacteria you will have: 100 cells that double every 20 minutes become 800 after 60 minutes, three doublings and a growth factor of 8.
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🔬 ScienceFree
Bulb spacing calculator
Know how many bulbs to buy before you dig: a bed 120 by 60 with a gap of 15 takes 9 bulbs per row in 5 rows, 45 in total, evenly spaced at 15.
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🔬 ScienceFree
Cat calorie calculator
Work out a cat's daily energy need: resting energy is 70 times weight in kilograms to the power 0.75, and a neutered indoor adult of 4.5 kg then gets a…
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🔬 ScienceFree
Cat calorie calculator
Get a daily calorie target for your cat: a 3-year-old, 4.5 kg cat with a sedentary routine needs about 260 kcal a day, from a resting need of 216.28 times 1.2.
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🔬 ScienceFree
Cell doubling time calculator
1,000 cells that reach 8,000 in 24 hours have doubled three times, so each generation took 8 hours.
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🔬 ScienceFree
Cephalexin for dogs dosage
A 10 kg dog prescribed cephalexin at 22 mg/kg needs 220 mg per dose, which is 0.88 of a 250 mg tablet.
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🔬 ScienceFree
Cricket chirp thermometer
Count a cricket's chirps for one minute: 120 chirps means about 70 °F, following Dolbear's law from 1897, with the Celsius value alongside.
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🔬 ScienceFree
DNA concentration calculator
An A260 reading of 0.50 on a ten-fold dilution means 250 ng/µL of double-stranded DNA in your stock: absorbance times 50 times the dilution.
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🔬 ScienceFree
Dog BMI calculator
A 30 kg dog with a 75 cm chest and a 70 cm body length falls in the ideal category, judged from weight and tape measurements instead of a human BMI chart.
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🔬 ScienceFree
Dog food calculator
A 20 kg four-year-old dog eating a 350 kcal-per-cup kibble needs about 3.03 cups, or 314.7 g, a day, based on resting energy and a life-stage factor.
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🔬 ScienceFree
Dog Metacam calculator
A 10 kg dog prescribed Metacam (meloxicam) at 0.1 mg/kg needs 1 mg per dose. Enter the scale weight and the rate your veterinarian wrote to get a repeatable…
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🔬 ScienceFree
Dog pregnancy calculator
A bitch mated on 1 March 2026 is due around 3 May 2026, 63 days later, with a whelping window from 28 April to 8 May.
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🔬 ScienceFree
Dog water intake calculator
A 10 kg dog at rest needs about 600 mL of water a day: 60 mL per kilogram times an activity factor of 1.
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🔬 ScienceFree
Feed conversion ratio calculator
A broiler flock that eats 3.6 kg of feed and gains 2.4 kg of live weight has an FCR of 1.5: one and a half kilos of feed per kilo of gain.
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🔬 ScienceFree
Grain bin calculator
Turn bin diameter and grain depth into storage capacity: an 18 ft bin filled to 16 ft is a cylinder with a 9 ft radius, and its cubic feet become bushels at…
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🔬 ScienceFree
Hamster age calculator
See what life stage your hamster is really in: at 12 months a Syrian hamster is about 42 in human years and already a senior, because hamsters grow up far…
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🔬 ScienceFree
Horse weight calculator
Get the weight your ration, dewormer dose and trailer limit depend on without a walk-on scale: a 72 in heart girth and 68 in body length give 1068.2182 lb, or…
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🔬 ScienceFree
Mutation frequency calculator
Turn a colony count into mutants per cell: 50 resistant colonies from 100000000 viable cells plated means one mutant in every 2000000 cells, a figure you can…
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🔬 ScienceFree
Pet sitter rates calculator
Quote a house sit in one step: a daily rate of 45 for the first pet plus 15 for a second dog, over 5 days, comes to 60 a day and 300 for the stay.
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🔬 ScienceFree
Pine straw calculator
Order the right number of bales before the truck leaves: 500 square feet of beds at 40 square feet per bale needs 12.5 bales, so you buy 13 and cover 520.
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🔬 ScienceFree
Plants calculator
Buy the right number of seedlings: a bed of 12 square metres with plants 0.5 metres apart on a square grid holds 48 plants, 4 per square metre, with no soil…
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🔬 ScienceFree
Potting soil calculator
Buy the right bag of potting mix: a round pot 20 cm across and 18 cm deep holds a little over five and a half litres.
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🔬 ScienceFree
Punnett square calculator
Cross two parents for one gene and see the whole grid: Aa × Aa gives one AA, two Aa and one aa, a 1:2:1 genotype ratio and a 3:1 dominant-to-recessive phenotype…
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🔬 ScienceFree
Rabbit cage size calculator
Size a hutch before you buy the wire: three medium rabbits of 2 to 4 kg need at least 9 square feet of floor, 3 each, and the cage must be 14 inches high…
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🔬 ScienceFree
Rabbit coat color calculator
Plan a mating by color, not by raw genotypes: two AaBbCcDd parents give 256 equally likely combinations, with chestnut in 81 of them (31.640625%) and ruby-eyed…
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🔬 ScienceFree
Rat cage calculator
Check a cage before you buy it: two pet rats need at least 4 cubic feet, 2 per rat, which at 20 inches high means a floor of 2.4 square feet, about 26 by 13…
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🔬 ScienceFree
Raw dog food calculator
A 20 kg adult dog fed 2.5% of its body weight needs 500 g of raw food a day, so the portion follows the dog, not a kibble bag.
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🔬 ScienceFree
Sheep gestation calculator
A ewe bred on January 1, 2026 is due around May 28, 2026: the calculator adds the standard 147-day sheep gestation to the breeding day so you can plan lambing…
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🔬 ScienceFree
Soil calculator
A bed 8 by 4 feet filled 1 foot deep holds 32 cubic feet of soil, a little more than one cubic yard: the calculator gives the volume in cubic feet, cubic yards…
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🔬 ScienceFree
Swine gestation calculator
A sow bred on January 1, 2026 is due to farrow around April 25, 2026: the calculator adds the 114-day mean pig gestation, the three months, three weeks and…
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🔬 ScienceFree
Tramadol for dogs
A 10 kg dog at a prescribed 3 mg/kg needs 30 mg of tramadol per dose: the calculator multiplies body weight by your veterinarian's milligrams-per-kilogram rate…
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🔬 ScienceFree
Tree age calculator
A northern red oak 24 inches across at breast height with a growth factor of 4 is about 96 years old: the calculator multiplies trunk diameter by the species…
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🔬 ScienceFree
Tree height calculator
Standing 50 m from the trunk and sighting the crown at 30 degrees puts it 28.867 m above your eye: the calculator multiplies distance by the tangent of the…
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🔬 ScienceFree
Tree leaves calculator
A crown of 12 cubic metres with 250 leaves per cubic metre holds about 3000 leaves: the calculator multiplies crown volume by leaf density and an optional fill…
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🔬 ScienceFree
Trihybrid Punnett square
Crossing AaBbCc with AaBbCc gives 64 equally likely offspring, 27 genotypes and the classic 27:9:9:9:3:3:3:1 phenotype ratio: the calculator builds the full 8…
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🔬 ScienceFree
Turtle tank size calculator
A turtle with a 4-inch shell needs at least 40 US gallons of water: the calculator applies the keepers' rule of ten gallons per inch of straight shell length…
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🔬 ScienceFree
Water potential calculator
A 0.1 mol/L sucrose solution at 295 K in an open beaker has a water potential of about −2.45 bars: the calculator adds solute potential and pressure potential…
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🔬 ScienceFree
Water-soluble fertilizer calculator
Turns a ppm target into grams on the scale: 200 ppm nitrogen in 10 litres with a 20% bag needs 10 grams of product.
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🔬 ScienceFree
Benzo[a]pyrene exposure
Breathing air with 1 ng/m³ of benzo[a]pyrene for 10 years means 20 ng inhaled each day and 73,000 ng in total for a 70 kg adult: a transparent screening dose…
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🔬 ScienceFree
Car vs bike CO2
A 10 km trip in a car using 8 L/100 km burns 0.8 litres of petrol and emits about 1.85 kg of CO2, against 0.21 kg by bicycle, so riding saves 1.638 kg.
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🔬 ScienceFree
Cigarette butts calculator
Twenty cigarettes a day leave 7,300 butts a year, about 1.46 kg of cellulose-acetate filters that do not dissolve: see a year of smoking as one pile for a quit…
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🔬 ScienceFree
CO2 breathing emission calculator
Ten people working eight hours at 0.045 kg per person-hour breathe out 3.6 kg of CO2 over 80 person-hours, a quick and auditable figure for a classroom, office…
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🔬 ScienceFree
Cryptocurrency footprint calculator
One Bitcoin transaction is about 700 kWh and 336 kg of CO2e, while ten thousand Ethereum transfers add up to 300 kWh and 120 kg: compare coins with a…
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🔬 ScienceFree
Drip faucet calculator
Sixty drips a minute at 0.25 mL each for thirty days waste 648 liters, from a leak that never looks dramatic: count the drops for one minute and see the total.
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🔬 ScienceFree
Fish mercury calculator
Two weekly 113 g servings of salmon at 0.022 ppm give 4.972 µg of mercury, while one serving of canned albacore gives 39.55 µg: compare plates on one scale…
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🔬 ScienceFree
Flight CO2 emissions calculator
A 1,000 km hop at 0.15 kg per passenger-kilometre puts 150 kg of CO2 on one traveller's account and 600 kg on a family of four: a transparent first number for a…
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🔬 ScienceFree
Hand dryers vs paper towels
Eight hand dries a day add up to 2,920 a year: 13.432 kg of CO2e with a high-speed dryer against 43.8 kg with paper towels, a saving of 30.368 kg.
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🔬 ScienceFree
Hydroelectric power calculator
Two cubic metres of water per second falling through a 10 m net head at 85 percent efficiency deliver 166.77 kW: a screening figure for a micro-hydro site or a…
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🔬 ScienceFree
Lotka-Volterra equations
Start with 10 prey and 5 predators, set the four rates and get the population at every step: with rates of 1.1, 0.4, 0.1 and 0.4 the coexistence equilibrium…
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🔬 ScienceFree
Olympic Games carbon footprint
Half a million attendees travelling 4,000 km each, 80,000 MWh of venue energy and 200,000 m² of new floor add up to 432,000 tonnes of CO2e, with travel alone at…
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🔬 ScienceFree
PHEV economy calculator
A 100-mile trip with 40 miles of electric range, 28 kWh per 100 miles and 50 mpg on gas uses 11.2 kWh and 1.2 gallons, folded into one MPGe figure.
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🔬 ScienceFree
Plastic footprint calculator
Seven bottles, ten bags and twenty packaging items a week add up to 27.82 kg of single-use plastic a year.
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🔬 ScienceFree
Shannon diversity index calculator
Counts of ten, twenty, thirty and forty individuals across four species give a Shannon index of 1.279854.
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🔬 ScienceFree
Solar panel calculator
Ten 400 W panels with 5 peak sun hours and 80% system efficiency make 16 kWh a day and 5840 kWh a year.
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🔬 ScienceFree
Solar panel wattage calculator
Ten 400 W panels at 5 peak sun hours form a 4 kW array that yields 20 kWh a day and 7300 kWh a year before any losses.
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🔬 ScienceFree
Vegan footprint calculator
Eating vegan every day of the week avoids 910 kg of CO2e, 546,000 liters of water and 3640 m² of farmland in a year compared with a typical mixed diet.
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🔬 ScienceFree
Water demand calculator
Ten thousand people using 150 liters each demand 1,500,000 liters a day and 547,500,000 liters a year.
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🔬 ScienceFree
Wind turbine profit calculator
An 80 m rotor at an average 7 m/s produces over three million kWh a year; this calculator turns that energy into yearly profit at your electricity price, after…
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🔬 ScienceFree
Zero-waste Christmas tree calculator
Renting the same 2 m Nordmann fir for 5 seasons instead of buying a new one each year avoids 12 kg of CO2.
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💰 Finance & moneyFree
Auto loan calculator
Finance 25,000 at 6.5% for 60 months and your payment is 489.15 a month, yet the first one sends 135.42 to interest and only 353.73 to the loan.
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Call the endpoint
One authenticated POST. The API returns a task_id immediately — copy-paste snippets in five languages on every page.
3
Collect the result
Receive a signed webhook the moment it's ready, or fetch a signed link. A failed task is never charged.
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On-device utilities — hash, QR, JSON, Text→PDF and more — run in your browser. No account, no limits.
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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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