APR ↔ APY Yield Converter

Convert interest rates between Annual Percentage Rate (APR) and Annual Percentage Yield (APY).

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APR vs APY MechanicsAPR (Annual Percentage Rate) is the simple interest rate charged or paid annually without compounding weight. APY (Annual Percentage Yield) includes the powerful compounding balance multiplier. Since interest compounds on top of itself ($n$ times a year), APY will always exceed the nominative APR.

Explore Additional Utilities

Exposure time — emulsion type ↔ UV source ↔ seconds

Estimate photo-emulsion exposure durations for screen printing frames or solar plates using light distance calculations.

printmaking

Stage lighting — lux ↔ foot candles ↔ beam angle

Convert between Lux and Foot-candles, and compute beam diameter coverage footprint at specific throw distances.

event-production

Fuel Efficiency Converter

Convert between miles per gallon (mpg), liters per 100km (L/105km), and km/liter conversions.

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Soil Plasticity Index Calculator

Calculate Plasticity Index (PI) from Liquid Limit (LL) and Plastic Limit (PL), and interpret soil state using the Atterberg limits chart.

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Battery capacity — Ah ↔ Wh ↔ days of autonomy

Convert between Amp-hours (Ah) and Watt-hours (Wh) and calculate battery bank backup days of autonomy based on loads.

renewable-energy

Roman Numeral Converter

Convert between classical Roman numerals (XIV, MCMLXX) and decimal integers dynamically.

devtools

Electron volts ↔ joules ↔ nanometers — photon energy

Convert between photon energy (eV, Joules) and physical wavelengths (nm, pm) or frequency (THz).

quantum-atomic

U-value ↔ thermal performance — double vs triple glazing

Analyze thermal conductivity (U-values and R-values) for energy-efficient glazing window performance.

glassmaking-glazing

Button Size Converter

Convert button measurements between traditional ligne (L), millimeters, and fractional inches.

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Encoder resolution (PPR ↔ degrees per pulse)

Convert between encoder Pulses Per Revolution (PPR), Cycles Per Revolution (CPR), and angular resolution down to arcseconds.

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Dewpoint & Relative Humidity Calculator

Calculate dewpoint, relative humidity, or air temperature using the Magnus-Tetens formula.

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Ore dilution — grade ↔ waste ↔ recovered grade

Calculate recovered ore grade, tonnage adjustments, dilution percentages, and mining waste contamination levels.

mining-drilling

Land Area & Acres Metric

Evaluate acreage, hectares, square meters, and square feet calculations.

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Script Character ↔ Word Counter

Analyze characters, spaces, punctuation, words, and word density. Convert text density predictions between CJK and Latin scripts.

devtools

Specific heat capacity — J/kg·K ↔ BTU/lb·°F

Convert between specific heat capacity units including J/kg·K, kJ/kg·°C, BTU/lb·°F, and cal/g·°C.

thermodynamics

Twist rate — caliber ↔ bullet length → stabilization

Calculate the optimal barrel rifling twist rate needed to stabilize a bullet of a given length, caliber, and velocity.

archery-ballistics

Torque Converter

Convert rotating force indicators between Newton-meters (Nm), pound-feet (lb-ft), and kgf·m.

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Livestock Live Weight ↔ Carcass Yield

Estimate hot carcass weight (HCW), dressing percentage, and final retail cut take-home meat yield for beef, pork, lamb, and goat.

health

Layer height ↔ print time estimator

Estimate 3D print duration changes and total layer counts when switching layer heights and print speeds.

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Tolerance converter (ISO fit classes ↔ clearance)

Find upper and lower deviation limits for shaft and hole ISO 286 fit classes like H7, g6, f7, and compute clearances in microns or mm.

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