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🧭 Travel & geographyFree
Boat ETA from Speed Calculator
Leave at 14:30 UTC with 42.5 nautical miles to go at 8.5 knots and you arrive at 19:30 UTC, exactly five hours later.
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🧭 Travel & geographyFree
Frequent-flyer miles earned
Fly 2,500 miles at a 100 % accrual rate with a 25 % status bonus and you earn 3,125 miles. Enter the fare or distance, your program's earning rate and your…
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🧭 Travel & geographyFree
Travel per diem calculator
A five-day trip at a daily allowance of 120, with 75% paid on the departure and return days, counts 4.5 reimbursable days and pays 540.
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🧭 Travel & geographyFree
Sail Area to Displacement Ratio Calculator
A boat with 500 square feet of working sail and 12,000 pounds of loaded displacement has an SA/D of 15.263, in the low band of conservative sail power.
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🧭 Travel & geographyFree
Trip budget by days calculator
Multiply four daily rates, for lodging, food, local transport and activities, by 7 days and get one trip total plus a subtotal per category, so you see which…
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🧭 Travel & geographyFree
Award ticket fuel surcharge calculator
120,000 points plus 172.8 in taxes and an 850 fuel surcharge for 2 travelers means 1,022.8 in cash at checkout, or 60,000 points and 511.4 each.
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🧭 Travel & geographyFree
Currency exchange amount calculator
Enter the rate you were quoted, such as 0.92 euros per dollar, then add a markup on the rate and a fee on the result: you see the effective rate, the fee and…
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🧭 Travel & geographyFree
Drive vs fly cost comparison calculator
A 720-mile trip at 30 mpg burns 24 gallons shared by the whole car, while airfare is multiplied by every traveler: see both totals, the cheaper option and the…
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🧭 Travel & geographyFree
Flight price per mile calculator
Spread a fare over the distance actually flown: a 2,450-mile route also counts as 3,942.8928 km, and you get the price per mile and per kilometer side by side.
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🧭 Travel & geographyFree
Travel pace to speed
A 12-minute-per-kilometre walk is 5 km/h, so a 10 km city tour takes 2 hours on the move. Enter your pace and distance to get the speed in km/h and mph and the…
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🧭 Travel & geographyFree
Driver reaction distance calculator
At 90 km/h a car covers 25 metres every second, so a 1.5-second reaction means 37.5 metres before the brakes even start.
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🧭 Travel & geographyFree
Car total cost of ownership calculator
Over 5 years at 12,000 miles a year and 30 mpg, a car burns 2,000 gallons, and that fuel joins purchase, insurance, maintenance and 15% yearly depreciation in…
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🧭 Travel & geographyFree
Axle Weight Distribution Calculator
A 2,000 kg vehicle with a 3 m wheelbase and its center of gravity 1.2 m behind the front axle puts 1,200 kg on the front axle and 800 kg on the rear, a 60/40…
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🧭 Travel & geographyFree
EV kWh per 100 miles calculator
30 kWh used over 150 miles is 20 kWh per 100 miles and 12.4274 kWh per 100 km: the sticker-style labels worked out from the energy and distance you actually…
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🧭 Travel & geographyFree
Rolling resistance power calculator
A 1,500 kg car with a rolling coefficient of 0.015 needs about 6 kW of continuous power at 100 km/h just to overcome its tyres' rolling resistance.
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🧭 Travel & geographyFree
Route time savings calculator
Route A, 120 km at 80 km/h, takes 90 minutes; route B, 135 km at 100 km/h plus a 5-minute detour, takes 86, so the longer road saves 4 minutes.
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🧭 Travel & geographyFree
Speedometer calibration factor calculator
A calibration factor of 1.05 turns an indicated 60 mph into an actual 63 mph, plus five percent. Enter the old and new rolling diameters, drive ratios or both…
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🧭 Travel & geographyFree
Underinflation fuel penalty calculator
Tires at 30 PSI instead of the recommended 35 are 5 PSI low, which at 0.2% per PSI costs 1% of your fuel economy.
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🧭 Travel & geographyFree
Engine volumetric efficiency calculator from airflow and RPM
A 5-liter four-stroke engine flowing 480 CFM at 6,000 rpm reaches 90.61% volumetric efficiency, against a theoretical 529.72 CFM.
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🧭 Travel & geographyFree
Wheel torque calculator
250 N·m from the engine in a 3.5 first gear with a 3.73 final drive becomes 3263.75 N·m at the driven axle, through an overall ratio of 13.055.
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🧭 Travel & geographyFree
Best runway for wind calculator
With wind from 250 degrees at 18 knots and runways 09, 18 and 27 available, runway 27 comes out first: it shares the lowest crosswind with 09 but gets headwind…
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🧭 Travel & geographyFree
EV off-peak charging savings
Shift all 3,600 kWh of a year's charging to off-peak hours and you save the full price gap on every kilowatt-hour; the calculator shows the peak-only cost, the…
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🧭 Travel & geographyFree
Initial flight bearing calculator from airport coordinates
From latitude 51.4706, longitude -0.461941 to latitude 40.6413, longitude -73.7781, the shortest route over the globe sets off at 287.937966° from true north.
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🧭 Travel & geographyFree
Temperature at altitude calculator
With 20 °C measured at an airfield 250 m up, the air at 3,000 m comes out at 2.13 °C, after 2,750 m of climb at the standard lapse rate.
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🧭 Travel & geographyFree
Cold Temperature Altimeter Error and Altitude Correction Calculator
At 3,000 ft indicated over a 1,000 ft aerodrome at −20 °C, the aircraft is 230.8 ft lower than the altimeter shows, at 2,769.2 ft true altitude.
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🧭 Travel & geographyFree
Contingency fuel calculator
A 2,000-unit trip with 5% contingency adds 100 units, and a 300-unit final reserve brings the total to 2,400: trip fuel, the percentage on top and the fixed…
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🧭 Travel & geographyFree
EV range at highway speed calculator
At 20 kWh per 100 km, a 75 kWh pack covers 375 km of motorway, well short of a mixed-cycle sticker.
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🧭 Travel & geographyFree
Horizontal sextant angle distance calculator
Two landmarks 2 nautical miles apart, seen 30° apart through the sextant, put you 3.7321 nautical miles off their baseline and 3.8637 from each one.
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🧭 Travel & geographyFree
Sailboat VMG from polar calculator
Sailing at 6.5 knots on a true wind angle of 45 degrees, you close on an upwind mark at 4.596194 knots.
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🧭 Travel & geographyFree
Time to waypoint at knots calculator
With 24.5 nautical miles to go at 7 knots, you reach the waypoint in 3.5 hours, or 3 h 30 min. Enter the distance left and your speed over ground to get the…
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🧭 Travel & geographyFree
Boat metacentric height stability
With a GM of 0.5 m, a displacement of 1000 tonnes and 5° of heel, the righting lever GZ is 0.043577871374 m and the righting moment 43.577871373829…
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🧭 Travel & geographyFree
Sea route great-circle distance calculator
From Miami to Bermuda the great circle measures 899.560522 nautical miles, and you leave on a true course of about 60 degrees.
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🧭 Travel & geographyFree
Trip Average Spend per Day Calculator
A 9-day trip and a 3-day trip can cost the same in total yet show very different spending: divide the total by the days, fractions like 2.5 included, and get…
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🧭 Travel & geographyFree
Vacation fund per paycheck calculator
With a fifth of your trip budget already saved and 12 paychecks to go, each paycheck needs to cover one twelfth of what is left.
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🔬 ScienceFree
Allee effect threshold calculator
See if a population is above its critical minimum: 40 animals with a threshold of 20 and carrying capacity of 100 grow by 480 per unit of time, a growing…
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🔬 ScienceFree
AT to GC Ratio Calculator for DNA Base Counts
Enter four base counts and see how AT compares with GC: 30 adenine, 30 thymine, 20 guanine and 20 cytosine give 60 against 40, a ratio of 1.5 or 3:2, with 60…
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🔬 ScienceFree
Beer Lambert concentration calculator
Turn a spectrophotometer reading into concentration: absorbance 0.75 with an extinction coefficient of 15000 and a 1 cm path gives 0.00005 mol/L, or 50 µmol/L.
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🔬 ScienceFree
Bradford protein calculator
Turn a Bradford reading into protein concentration: absorbance 0.42 on a curve with slope 0.035 and intercept 0.05 gives just over ten and a half, in the units…
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🔬 ScienceFree
Chilling hours calculator
Of eight hourly readings, five fell below 7.2 °C, so the orchard logged 5 chilling hours. Paste your hourly temperatures, pick the threshold, and see whether…
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🔬 ScienceFree
Codon Usage Fraction Calculator for Gene Codon Counts
If a gene has 18 TTT and 12 TTC codons, both encoding phenylalanine, TTT accounts for 0.6 of that amino acid's codons.
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🔬 ScienceFree
Dilution for a countable plate calculator
A sample at about 250,000,000 CFU/mL, plated at 0.1 mL, falls in a 30 to 300 colony range at a 1:100,000 dilution, with about 250 colonies expected.
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🔬 ScienceFree
Dilution to target OD calculator
Bringing a culture from OD 1.8 down to 0.3 in 50 mL is a sixfold dilution: one part culture to five parts fresh medium.
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🔬 ScienceFree
DNA helical turns calculator from base pairs
A 1,050 base-pair fragment makes 100 helical turns, using the common B-form average of 10.5 base pairs per turn.
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🔬 ScienceFree
Dry matter intake calculator
25 kg of fresh feed at 40% dry matter supplies 10 kg of dry matter a day. Enter the daily as-fed weight and the feed's dry matter percentage in kilograms, grams…
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🔬 ScienceFree
dsDNA mass to molar concentration calculator
A 5,000 bp plasmid weighs about 3,300,000 g/mol at 660 g/mol per base pair, so 50 ng/µL of it becomes a molar figure in µM, nM and pM.
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🔬 ScienceFree
dsDNA ng/µL calculator from A260 absorbance
An A260 of 0.24 measured on a tenfold dilution means 120 ng/µL in the original sample: 50 ng/µL per absorbance unit times the dilution.
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🔬 ScienceFree
Egg Incubation Hatch Date Calculator by Bird Species
Chicken eggs set on 1 March 2026 should hatch around 22 March 2026, after the standard 21 days. Pick the species and the set date to label trays, plan lockdown…
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🔬 ScienceFree
Fertilizer NPK rate per hectare calculator
Supplying 120 kg/ha of nitrogen from a product with 20% nitrogen takes 600 kg/ha of it; the calculator checks phosphorus and potassium too and picks the rate…
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🔬 ScienceFree
Fish stocking density calculator
Multiply pond size by the stocking rate you picked and get a count ready for the order: 1000 m² at 2 fish per m² means 2000 fish.
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🔬 ScienceFree
Forage allowance calculator
Compare grazing pressure fairly across paddocks and herds: 6800 kg of usable dry matter on 4 ha for 40 animals of 450 kg means 18000 kg of live weight to feed…
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🔬 ScienceFree
Bacterial Generation Time Calculator
Get the time one bacterial generation takes: 6 generations in 180 minutes means 30 minutes per generation, or 2 generations per hour.
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🔬 ScienceFree
Crop harvest index calculator
See how much of a crop's above-ground growth ends up as harvest: 4500 kg per hectare of grain from 12000 kg per hectare of biomass is a harvest index of 0.375…
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🔬 ScienceFree
Home range density calculator
Turn a telemetry or survey summary into one comparable figure: 24 animals sharing a combined 12 km² of home range means 2 individuals per km², also shown per…
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🔬 ScienceFree
Importance value index calculator for plant species
Sum up how numerous, widespread and dominant a plant species is in one survey: Quercus alba at 35.5% density, 42.25% frequency and 28.75% dominance scores 106.5…
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🔬 ScienceFree
Irrigation run time calculator
Know how long to leave the water on: putting 25 mm on 800 m² at 40 L per minute takes 20000 litres and 500 minutes of run time, ready for a controller or a…
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🔬 ScienceFree
Life Table Survivorship Calculator
Standardize a cohort life table in one step: if 1000 animals start and 920, 760, 410 and 0 remain at each later age, survivorship reads 92%, 76%, 41% and 0.
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🔬 ScienceFree
Lime requirement calculator
Go from a lab report to a lime order: a buffer pH of 6.2 with a 6.5 target calls for 3.64 tons of pure calcium carbonate per acre, or 36.4 tons for a 10-acre…
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🔬 ScienceFree
Livestock daily water requirement
Size troughs and tanks before the animals arrive: 40 dairy cows at 100 litres each and 120 sheep at 8 litres each drink 4960 litres a day between them.
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🔬 ScienceFree
Additive Map Distance Calculator with Double Crossover Correction
Join two map intervals in a known A-B-C order: 12 cM plus 8 cM gives 20 cM, while double crossovers with a coefficient of coincidence of 0.75 bring the…
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🔬 ScienceFree
Molar absorptivity calculator
Get the extinction coefficient straight from your spectrophotometer reading: an absorbance of 0.75 at 0.000025 mol/L in a 1 cm cuvette gives 30000 L per mole…
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