Scientific Calculator
Safe expression evaluator: + − × ÷ ^ % √ log sin cos π with steps.
Everyday calculators and unit converters
Math, algebra, geometry, unit conversion, physics and engineering tools, including scientific calculation, fractions, equations and Ohm’s law.
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Math
Fraction Calculator
Add/subtract/multiply/divide fractions with simplification steps.
Ratio & Proportion Solver
Simplify ratios and solve a:b = c:x.
Exponent & Root Calculator
Powers, nth roots with laws explained.
Logarithm Calculator
log base-n with change-of-base steps.
Percent Change
Growth/decline % with interpretation.
GCD / LCM Calculator
Euclid's algorithm with steps.
Modulo Calculator
Remainder with negative-number rules.
Rounding Calculator
Floor/ceil/round to N decimals.
Ratio Splitter
Divide an amount by ratio a:b:c.
Statistics
Mean / Median / Mode
Paste numbers → average, median, mode, range.
Standard Deviation & Variance
Sample/population σ, variance, with table.
Algebra
Linear Equation Solver
ax + b = c with deterministic steps.
Quadratic Solver
ax²+bx+c=0: discriminant, roots, vertex, steps.
Slope & Distance
Between two points with steps.
Geometry
Triangle Calculators
Area, perimeter, Pythagoras with diagrams data.
Circle Calculator
Area, circumference, diameter from radius.
Cylinder / Sphere / Cone Volume
Volumes + surface areas with formulas.
Rectangle / Square Area
Area + perimeter + diagonal.
Sphere / Cube Geometry
Surface + volume with formulas.
Pythagoras Calculator
Missing side with diagram data.
Conversion
Length Converter
mm cm m km in ft yd mi with exact factors.
Weight Converter
mg g kg oz lb t with exact factors.
Temperature Converter
°C °F K with formulas shown.
Area Converter
m² ft² acre ha with table.
Volume Converter
mL L m³ cup fl-oz gal.
Speed Converter
m/s km/h mph ft/s kn.
Pressure Converter
Pa kPa bar psi atm.
Energy Converter
J kJ cal kcal Wh kWh eV.
Power Converter
W kW hp with table.
Digital Storage Converter
bit B KB MB GB TB (decimal + binary).
Time Units Converter
ms s min h day week year.
Electrical
Ohm's Law Calculator
V=IR: solve any variable + power.
Electric Power & Cost
Watts → kWh → bill estimate.
Physics
Force / Torque / Pressure
F=ma, τ=rF, P=F/A with units.
Density Calculator
ρ=m/V with unit table.
Flow / Speed Estimators
Everyday rate math with units.
Health
BMI Calculator
Body-mass index with WHO bands (informational).
BMR / TDEE Calculator
Mifflin-St Jeor + activity multiplier (informational).
Construction
Concrete / Paint Estimators
Bags, volume and coverage for DIY jobs.
Everyday
Fuel Cost Calculator
Trip cost from distance, efficiency and price.
GPA Calculator
Weighted average from grades + credits.
Age Calculator
Exact age Y/M/D with leap-year rules.
Tip & Bill Splitter
Shares with rounding options.
Stacked Discounts
2 sequential discounts + tax.
ID / Passport Size Helper
Dimensions + aspect for common photo sizes.
Cooking Converter
Cups↔mL, oz↔g, °F↔°C for recipes.
Grade → Percent
Letter bands to % with table.
Unit Price Compare
Price per 100g/100ml/ea with winner.
Pace / Speed / Distance
Runners: pace from time+distance.
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Why CalcSphere?
Browse related calculators and converters in one place. Each tool shows its own inputs, formulas, and supported output.
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FAQ
Is it free?
Yes — every tool is free with no signup and no credits.
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The app shell and deterministic tools can work after they are cached. Some file engines need an initial connection, and browser storage can be cleared.
Does it work on mobile?
Yes — touch-friendly, one-tap download, adaptive workers for weak devices.
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Guides
Fractions without fear: a 10-minute guide · Unit conversion: exact factors vs approximations · Ohm's law in practice — practical, original explainers with examples.