Browse all calculators: page 25 of 34

Complete alphabetical index of all 6,718 calculators. Page 25 of 34. Prefer to search or filter? Use the tool finder.

• Radian per Second to Degree per Second Converter Unit converters
• Radian per Second to Revolution per Minute Converter Unit converters
• Radian per Second to Revolution per Second Converter Unit converters
• Radian to Arcminute Converter Unit converters
• Radian to Arcsecond Converter Unit converters
• Radian to Gradian Converter Unit converters
• Radian to Revolution Converter Unit converters
• Radians to Revolutions Calculator General mathematics
• Radiant Floor Heating Calculator: Tubing Length and BTU Home, garden and construction
• Radiant Floor Loop Length Calculator General
• Radiation Dose Converter: Convert Between Sievert, Gray, and Rem Unit converters
• Radiation Pressure Calculator: Light Force on a Surface Physics and science
• Radiator BTU Output Calculator 2026: Heating BTU per Room General
• Radiator BTU Sizing Calculator: Heat Output Needed Home, garden and construction
• Radio Link Budget Calculator: Received Signal Level and Margin Personal finance
• Radioactive Dating Age Calculator Chemistry
• Radioactive Decay Calculator: N = N0 * (1/2)^(t/T) Physics and science
• Radioactive decay: Solve for half-life Physics and science
• Radioactive decay: Solve for Initial Amount Physics and science
• Radioactive decay: Solve for Remaining Amount Physics and science
• Radioactive decay: Solve for Time Physics and science
• Radioactive Half-Life Calculator: Remaining Amount General
• Radioactivity Activity Calculator: A = Lambda * N Physics and science
• Radioactivity Converter: Becquerel, Curie, and Rutherford Unit converters
• Radiocarbon Dating Calculator: Carbon-14 Age Estimation General
• Radius of Gyration Calculator: k = sqrt(I/m) Physics and science
• Raffle Draw Odds Calculator Lifestyle and personal
• Raffle Win Probability Calculator: Your Odds Probability and combinatorics
• Rafter Length Calculator: Common Rafter with Overhang Home, garden and construction
• RAID 5 Capacity Calculator Technology and digital
• RAID Storage Calculator: Usable Capacity and Fault Tolerance Technology and digital
• RAID Usable Capacity Calculator: Storage After Redundancy General
• Rain Barrel Calculator: Rainwater Collection Potential and Savings General
• Rain Barrel Capacity Calculator: Rainwater Collected General
• Rainbow Table Size Calculator Cryptography and infosec math
• Rainfall Intensity Calculator General
• Rainfall Runoff Calculator | Rational Method (Q = CiA) Environment and sustainability
• Rainfall Volume Calculator Environment and sustainability
• Rainfall Volume from Area Calculator Meteorology and forecasting
• Rainwater Harvest Calculator: Gallons From Roof Area Home, garden and construction
• Rainwater Harvesting Calculator: Gallons From Roof Environment and sustainability
• Rainwater Tank Sizing Calculator: Storage You Need Home, garden and construction
• Raise Needed to Beat Inflation Calculator 2026: Keep Pace General
• Raised Bed Planting Density Calculator: Plants Per Square Foot Physics and science
• Raised Bed Soil Volume Calculator 2026: Cubic Feet of Soil Needed Home, garden and construction
• Raised Bed Soil Volume Calculator: Cubic Feet and Bags Home, garden and construction
• Raised Garden Bed Calculator: Soil Volume Home, garden and construction
• RAM Bandwidth Calculator: Theoretical Memory Bandwidth Technology and digital
• Ramp Gradient Calculator Physics and science
• Ramp Slope Calculator Home, garden and construction
• Random Encounter Rate Calculator: Probability Per Step Over N Steps Probability and combinatorics
• Random Number Generator Calculator Lifestyle and personal
• Range and Midrange Calculator Advanced mathematics and statistics
• Range Calculator Advanced mathematics and statistics
• Range of Lights Calculator: Geographic Visibility Marine navigation
• Range on a Downhill Slope Calculator Physics and science
• Range on an Incline (up-slope) Calculator Physics and science
• Ransomware Downtime Cost Calculator: Total Incident Cost Cryptography and infosec math
• Ranson Criteria Calculator for Pancreatitis General
• Raoult's Law Calculator Chemistry
• Raoult's Law Vapor Pressure Calculator Physics and science
• Raoults Law Calculator: Solution Vapor Pressure Chemistry
• Rate Constant (Arrhenius) Calculator Chemistry
• Rate of Climb Calculator: Aircraft Climb Performance General
• Rate of Return Calculator 2026: Simple and Annualized ROR General
• Ratio Calculator General
• Ratio Simplify Calculator: Reduce to Lowest Terms General
• Ratio to Fraction Calculator General mathematics
• Rational Root Test Calculator General mathematics
• Rationalise Denominator (1/sqrt(n)) Calculator General mathematics
• Rayleigh Resolution Calculator: 1.22 lambda/D Formula Photography and optics
• RC Aircraft Thrust Calculator: Thrust-to-Weight Ratio Aviation flight planning
• RC Charge Percentage Calculator: Time Constant Electronics and electrical
• RC Charging Voltage Calculator: V = V0(1 - e^(-t/RC)) Electronics and electrical
• RC Filter Cutoff Calculator Electronics and electrical
• RC High Pass Filter Cutoff Calculator Electronics and electrical
• RC High-Pass Cutoff Calculator: f = 1 / (2 pi R C) General
• RC Low Pass Filter Cutoff Calculator Electronics and electrical
• RC Low-Pass Cutoff Calculator: f = 1 / (2 pi R C) General
• RC Snubber Resistor Calculator Electronics and electrical
• RC Time Constant Calculator: Tau, Charge and Discharge Date and time
• RC Time constant: Solve for Capacitance Physics and science
• RC Time constant: Solve for Resistance Physics and science
• RC Time constant: Solve for Time Constant Physics and science
• Reaction Bond Energy Calculator: Enthalpy from Bonds Broken and Formed General
• Reaction Enthalpy Calculator (Hess's Law) Physics and science
• Reaction Enthalpy from Formation Calculator Chemistry
• Reaction Percent Yield Calculator General
• Reaction Quotient (Q) Calculator: Q vs Keq Chemistry
• Reaction Rate Calculator: Rate = k[A]^n Chemistry
• Reaction Rate Calculator: Rate Law and Order General
• Reaction Rate Law Calculator: Rate from k and Orders Chemistry
• Reaction Rate Law Order Calculator General
• Reaction Time Calculator: Simple and Choice Reaction Time Rating Fitness and sports
• Reading Level Calculator: Flesch Reading Ease Score Education and learning
• Reading Speed and Comprehension Calculator General
• Reading Speed Calculator: Words Per Minute and Level General
• Reading Time by Page Count Calculator: Plan Your Reading Productivity and time management
• Reading Time Calculator: Estimate Time to Read Any Text Technology and digital
• Real Estate Appreciation Calculator: Future Home Value and Equity General
• Real Estate Break-Even Calculator: Break-Even Occupancy Rate Business and enterprise
• Real Estate Cap Rate Calculator Personal finance
• Real Estate Commission Calculator: Agent Fee on Home Sale General
• Real Estate Net Operating Income Calculator: NOI Formula General
• Real Estate Transfer Tax Calculator | Sale Price x Rate Personal finance
• Real Estate Transfer Tax Calculator 2026: All 50 States United States
• Real Interest Rate Calculator Personal finance
• Real Rate of Return Calculator: Fisher Equation General
• Real Return Calculator 2026 (Fisher Equation) United States
• Real Return Calculator: Inflation-Adjusted Investment Return Personal finance
• Real Yield Protocol Calculator: Revenue Share APR DeFi and on-chain
• Rebar Calculator: Estimate Reinforcing Steel for Concrete Home, garden and construction
• Rebar Development Length Calculator Physics and science
• Rebar Lap Length Calculator Physics and science
• Rebar Spacing Calculator: Number of Bars Needed Home, garden and construction
• Rebar Weight Calculator Physics and science
• Rebase Token Balance Calculator DeFi and on-chain
• Receivables Turnover Calculator 2026: AR Turns and DSO General
• Receive Antenna Gain Calculator: DBi and DBd Electronics and electrical
• Recipe Cost Calculator: Cost Per Serving for Any Recipe Food, cooking and beverages
• Recipe Cost Per Serving Calculator: Food Cost Per Dish Lifestyle and personal
• Recipe Scaler Calculator Food, cooking and beverages
• Recipe Scaling Calculator: Scale Any Recipe Up or Down Food, cooking and beverages
• Reciprocal Calculator: One Over a Number General mathematics
• Reciprocity Exposure Calculator: Film Long Exposure General
• Recommended Video Bitrate Calculator 2026: Bitrate from Resolution Technology and digital
• Recovery Point Objective (RPO) Calculator General
• Recovery Time Calculator: How Long to Rest Between Sessions Fitness and sports
• Recovery Time Objective (RTO) Calculator Date and time
• Recrystallization Recovery Calculator: Yield from Solubility Chemistry
• Rectangle Area Calculator General mathematics
• Rectangle Perimeter Calculator General mathematics
• Rectangular Pyramid Surface Area Calculator General mathematics
• Rectangular Pyramid Volume Calculator General mathematics
• Rectangular to Polar Calculator General mathematics
• Rectangular Weir Flow Calculator Physics and science
• Recurring Event Date Calculator Date and time
• Recurring Meeting Cost Calculator: Know What Meetings Cost Productivity and time management
• Recursion Depth (factorial) Calculator Technology and digital
• Recycling Diversion Rate Calculator | % Waste Diverted Environment and sustainability
• Recycling Savings Calculator: CO2, Energy, and Trees Saved Environment and sustainability
• Redox Titration Concentration Calculator Chemistry
• Redshift Velocity Calculator: Hubble's Law and Cosmological z Astronomy and space
• Redundancy Calculator: N+1, N+M and K-of-N Systems Technology and digital
• Refactoring ROI Calculator: Return on Investment for Code Improvement Personal finance
• Reference Angle Calculator General mathematics
• Reference Evapotranspiration Calculator: ET0 Simplified Estimate Meteorology and forecasting
• Refinance Break-Even Calculator 2026: When Refinancing Pays Off Business and enterprise
• Refinance Calculator 2026: Break-Even and Monthly Savings United States
• Refinance Savings Calculator: Monthly Savings and Break-Even Personal finance
• Refractive Index Calculator: n = c/v and Snell's Law Method Physics and science
• Refrigeration Tonnage Calculator Physics and science
• Refrigerator COP Calculator: Carnot Coefficient of Performance Physics and science
• Refrigerator Size Calculator: Cubic Feet Capacity Guide General
• Refrigerator Thaw Time Calculator: Meat Defrost Food, cooking and beverages
• Regenerative Braking Energy Calculator Automotive and motorsport
• Regular Decagon Area Calculator General mathematics
• Regular Decagon Perimeter Calculator General mathematics
• Regular Dodecahedron Surface Area Calculator General mathematics
• Regular Dodecahedron Volume Calculator General mathematics
• Regular Heptagon Area Calculator General mathematics
• Regular Heptagon Perimeter Calculator General mathematics
• Regular Hexagon Area Calculator General mathematics
• Regular Hexagon Perimeter Calculator General mathematics
• Regular Icosahedron Surface Area Calculator General mathematics
• Regular Icosahedron Volume Calculator General mathematics
• Regular Nonagon Area Calculator General mathematics
• Regular Nonagon Perimeter Calculator General mathematics
• Regular Octagon Area Calculator General mathematics
• Regular Octagon Perimeter Calculator General mathematics
• Regular Octahedron Surface Area Calculator General mathematics
• Regular Octahedron Volume Calculator General mathematics
• Regular Pentagon Area Calculator General mathematics
• Regular Pentagon Perimeter Calculator General mathematics
• Regular Polygon Apothem Calculator 2026: Apothem from Side Length General mathematics
• Regular Polygon Area Calculator General mathematics
• Regular Polygon Area Calculator: Any Number of Sides General mathematics
• Regular Polygon Perimeter Calculator General mathematics
• Regular Tetrahedron Surface Area Calculator General mathematics
• Regulator Heat Dissipation Calculator 2026: Linear Regulator Power Electronics and electrical
• Regulator Heatsink Sizing Calculator Electronics and electrical
• Reinsurance Cession Calculator: Ceded Premium and Loss Insurance and actuarial
• Related Rates Calculator Advanced mathematics and statistics
• Relationship Age Difference Calculator Lifestyle and personal
• Relationship Health Score Calculator: Assess Your Relationship Quality General
• Relative Error Calculator General mathematics
• Relative Fat Mass Calculator (RFM) Health and wellness
• Relative Frequency Calculator Advanced mathematics and statistics
• Relative Humidity and Dewpoint Calculator: RH from T and Td Meteorology and forecasting
• Relative Humidity Calculator: From Dew Point and Temperature Environment and sustainability
• Relative Intensity 1RM Percentage Calculator Fitness and sports
• Relative Luminance (WCAG) Calculator 2026: SRGB Color Brightness General
• Relative Risk Calculator from a 2x2 Table Advanced mathematics and statistics
• Relative Standard Deviation Calculator 2026: RSD as a Percent General mathematics
• Relative Strength Ratio Calculator General
• Relative Uncertainty Calculator General mathematics
• Relativistic Doppler Calculator: f' = f * sqrt((1+b)/(1-b)) Physics and science
• Relativistic Kinetic Energy Calculator: KE = (gamma-1)mc^2 Physics and science
• Relativistic Momentum Calculator: p = Gamma * m * v Physics and science
• Relativistic Time Dilation Calculator: t = t0 / Gamma Physics and science

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