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Hundreds of ready-made tasks — PDF, images, audio, OCR, text AI, scraping, data and more — behind a single REST API. Send a job, get a finished result by webhook. No servers, no per-model tokens, a price you can read.
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The full catalog
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⚙️ Developer UtilitiesFree
Solar battery charge time calculator
hours from Ah, current, efficiency
S
POST /earth/solar-charge-time$0.002⚙️ Developer UtilitiesFree
Fog stability index calculator
FSI from T, Td and T850
S
POST /earth/fog-stability-index$0.002⚙️ Developer UtilitiesFree
Frost risk index calculator
overnight T, dew point, clouds
A
POST /earth/frost-risk-index$0.002⚙️ Developer UtilitiesFree
Solar water heater energy savings
kWh from demand, rise, fraction
S
POST /earth/solar-water-heater-savings$0.002⚙️ Developer UtilitiesFree
Water heating energy calculator
energy to heat a water volume
A
POST /earth/water-heating-energy$0.002⚙️ Developer UtilitiesFree
Temperature at depth calculator
geothermal gradient
A
POST /earth/geothermal-temperature-at-depth$0.002⚙️ Developer UtilitiesFree
Monthly thermal amplitude calculator
max minus min mean temps
S
POST /earth/thermal-amplitude-series$0.002⚙️ Developer UtilitiesFree
Cross-price elasticity of demand calculator
XED, free
S
POST /econ/cross-price-elasticity-demand$0.002⚙️ Developer UtilitiesFree
Consumer surplus linear demand calculator
triangle CS
S
POST /econ/consumer-surplus-linear-demand$0.002⚙️ Developer UtilitiesFree
Unit-elastic price calculator
revenue-max point on linear demand
A
POST /econ/unit-elastic-price$0.002⚙️ Developer UtilitiesFree
Marginal cost from cost function calculator
MC = b + 2cQ
S
POST /econ/marginal-cost-from-cost-function$0.002⚙️ Developer UtilitiesFree
Producer tax burden calculator
share of a per-unit tax on sellers
A
POST /econ/producer-tax-burden$0.002⚙️ Developer UtilitiesFree
Shutdown-point price calculator
stop producing below min AVC
A
POST /econ/shutdown-point$0.002⚙️ Developer UtilitiesFree
Total product from production function
TP, MP, AP and stages
S
POST /econ/total-product-from-function$0.002⚙️ Developer UtilitiesFree
Bertrand duopoly equilibrium calculator
prices to MC
S
POST /econ/bertrand-duopoly-equilibrium$0.002⚙️ Developer UtilitiesFree
N-firm concentration ratio calculator
CR_n from shares
A
POST /econ/concentration-ratio-crn$0.002⚙️ Developer UtilitiesFree
Inflation rate from CPI calculator
cost of living, free
S
POST /econ/inflation-rate-from-cpi$0.002⚙️ Developer UtilitiesFree
Money supply from MV=PQ
solve M = PQ/V
A
POST /econ/money-supply-mv-pq$0.002⚙️ Developer UtilitiesFree
Compound annual GDP growth rate calculator
CAGR from two GDP levels
S
POST /econ/compound-growth-rate-gdp$0.002⚙️ Developer UtilitiesFree
Purchasing power parity exchange rate calculator
implied FX as P / P*
A
POST /econ/purchasing-power-parity$0.002⚙️ Developer UtilitiesFree
Autarky vs trade consumption calculator
welfare gain
S
POST /econ/autarky-vs-trade$0.002⚙️ Developer UtilitiesFree
Tariff-quota equivalence calculator
quota or tariff equivalent
A
POST /econ/tariff-vs-quota-equivalent$0.002⚙️ Developer UtilitiesFree
Real minimum wage calculator
nominal wage × (CPI base / CPI)
A
POST /econ/real-minimum-wage$0.002⚙️ Developer UtilitiesFree
Saddle point game theory calculator
pure-strategy solution
S
POST /econ/saddle-point-game$0.002⚙️ Developer UtilitiesFree
Gini before vs after tax
redistribution calculator
A
POST /econ/gini-tax-redistribution$0.002⚙️ Developer UtilitiesFree
Profit at given output calculator
π(Q) = TR − TC, free
S
POST /econ/profit-at-output$0.002⚙️ Developer UtilitiesFree
Bell curve grade calculator
A–F from score, mean, σ
A
POST /edu/bell-curve-grade$0.002⚙️ Developer UtilitiesFree
Final exam grade needed calculator
score to hit your target
S
POST /edu/final-exam-grade-needed$0.002⚙️ Developer UtilitiesFree
Exam T-score calculator
convert z-score to T (mean 50, SD 10)
S
POST /edu/exam-t-score$0.002⚙️ Developer UtilitiesFree
Overall grade from categories
weighted course % and letter
A
POST /edu/overall-from-categories$0.002⚙️ Developer UtilitiesFree
Unweighted GPA calculator
4.0 scale, every course equal
S
POST /edu/unweighted-gpa$0.002⚙️ Developer UtilitiesFree
Memory retention after days
exponential forgetting curve calculator
A
POST /edu/memory-retention-after$0.002⚙️ Developer UtilitiesFree
Normalized test score calculator
min-max scale for fair comparison
S
POST /edu/normalized-test-score$0.002⚙️ Developer UtilitiesFree
Class percentile rank of a score
% of classmates who scored lower
A
POST /edu/percentile-rank-class$0.002⚙️ Developer UtilitiesFree
Weekly study hours per course
allocate by credits or difficulty
S
POST /edu/weekly-study-per-course$0.002⚙️ Developer UtilitiesFree
APA format pages estimator
word count to APA paper pages
A
POST /edu/apa-pages-estimate$0.002⚙️ Developer UtilitiesFree
Dissertation chapter word split
intro, methods, results, discussion
S
POST /edu/dissertation-chapters-split$0.002⚙️ Developer UtilitiesFree
Pause-adjusted speech duration
word count, rate, and sentence pauses
A
POST /edu/pause-adjusted-speech$0.002⚙️ Developer UtilitiesFree
Words needed for a speech
target minutes and speaking pace (WPM)
S
POST /edu/words-for-minutes$0.002⚙️ Developer UtilitiesFree
Test score confidence band
true-score range from SEM
A
POST /edu/test-confidence-band$0.002⚙️ Developer UtilitiesFree
Weighted final two-part grade
coursework + exam module mark
S
POST /edu/weighted-final-two-parts$0.002⚙️ Developer UtilitiesFree
Language daily minutes for a goal
practice minutes per day
A
POST /edu/language-daily-minutes$0.002⚙️ Developer UtilitiesFree
Long division with remainder
quotient, leftover, steps
S
POST /edu/long-division-steps$0.002⚙️ Developer UtilitiesFree
CEFR level by study hours
estimate A1–C2 from guided hours
A
POST /edu/cefr-by-hours$0.002⚙️ Developer UtilitiesFree
Greatest common factor calculator
GCF of two or more numbers
S
POST /edu/gcf-school$0.002⚙️ Developer UtilitiesFree
Transverse shear stress calculator
τ = VQ/(It) beam formula
S
POST /eng/transverse-shear-stress$0.002⚙️ Developer UtilitiesFree
Cantilever UDL moment calculator
fixed-end M = wL²/2
S
POST /eng/cantilever-udl-moment$0.002⚙️ Developer UtilitiesFree
Parallel-axis theorem inertia calculator
I = Ī + A·d²
A
POST /eng/parallel-axis$0.002⚙️ Developer UtilitiesFree
Corrected endurance limit calculator
Se = ka × kb × kc × Se'
A
POST /eng/endurance-limit$0.002⚙️ Developer UtilitiesFree
Principal stress 2D calculator
Mohr's circle σ1, σ2, τmax
S
POST /eng/principal-stress-2d$0.002⚙️ Developer UtilitiesFree
Brinell hardness number calculator
HBW from load, D and d
A
POST /eng/brinell-number$0.002⚙️ Developer UtilitiesFree
Percent reduction of area calculator
RA% from A0 and Af
S
POST /eng/reduction-of-area$0.002⚙️ Developer UtilitiesFree
Colebrook friction factor calculator
Darcy f from ε/D and Re
S
POST /eng/friction-colebrook$0.002⚙️ Developer UtilitiesFree
Orifice discharge calculator
Q = Cd·A·√(2gh) from head
A
POST /eng/orifice-flow$0.002⚙️ Developer UtilitiesFree
Cylindrical pipe conduction calculator
Q = 2πkLΔT / ln(ro/ri)
A
POST /eng/cylinder-conduction$0.002⚙️ Developer UtilitiesFree
Gear output torque calculator
T_out = T_in × gear ratio
A
POST /eng/gear-output-torque$0.002⚙️ Developer UtilitiesFree
Conductive heat flux calculator
q = k ΔT / L through a wall
S
POST /eng/heat-flux$0.002⚙️ Developer UtilitiesFree
Overall heat transfer coefficient calculator
wall assembly U
S
POST /eng/overall-u$0.002⚙️ Developer UtilitiesFree
Power screw efficiency calculator
η from lead angle and μ
S
POST /eng/power-screw-efficiency$0.002⚙️ Developer UtilitiesFree
Helical spring rate calculator
k = G d⁴ / (8 D³ Na)
A
POST /eng/spring-rate-helical$0.002No capabilities match your search.
How it works
1
Get your key
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2
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.
Pay only for what you use
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Free tools
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Per task
$0.002+
The full API — 7500+ capabilities — billed only for what you run, from $0.002 per call. No monthly fee.
Balance
$10.00+
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