Free Online Calculators

Every calculator on this site is free, works on any device and runs privately in your browser, with no sign-up and no data stored. Pick a tool below.

School & Study Calculators

3D GPA calculator showing a 3.85 GPA with A+, A and B+ letter grade blocks

GPA CalculatorSemester, cumulative and weighted GPA

3D blocks for homework 20%, quizzes 30% and tests 50% adding up to an 88% B+ class grade

Grade CalculatorCurrent class grade from assignments

3D blocks: current grade 85% and final worth 25% means you need 79% on the final for a B

Final Grade CalculatorScore you need on the final exam

3D scientific calculator with sin, cos, tan, log and square root keys showing sin(30)+log(100) = 2.5

Scientific CalculatorTrig, logs, powers and more

3D snowy school building next to a 78% snow day chance block

Snow Day CalculatorChance school closes tomorrow

Money & Work Calculators

3D bars rising year by year with a gold dollar coin, showing compound interest growth

Compound Interest CalculatorGrow savings with compounding

3D bars growing year by year next to a 401(k) block, showing retirement savings growth

401(k) CalculatorRetirement savings with employer match

3D bars growing year by year with a green tax-free block, showing Roth IRA growth

Roth IRA CalculatorTax-free retirement growth

3D blocks of 50%, 30% and 20% disability ratings combining into a 70% VA rating

VA Disability CalculatorCombined rating and 2026 pay

3D time card with five 8-hour workdays adding up to 40 hours

Hours CalculatorWork hours, breaks and overtime

Health & Nutrition Calculators

3D stack showing BMR, activity and food digestion adding up to a 2,450 calorie TDEE

TDEE CalculatorDaily calories and maintenance

3D stack of macro layers: carbs 40%, protein 30% and fat 30%

Macro CalculatorProtein, carbs and fat grams

3D vial labeled 5 mg next to an insulin syringe marked in units

Peptide CalculatorReconstitution and syringe units