AP Chemistry Calculators

Estimate Your AP Chemistry Score

To turn practice-exam points into a 1–5 estimate, start with the AP Chem Score Calculator. The two section calculators go deeper into one part of the exam.

Full examAP Chem Score CalculatorMultiple-choice and free-response points to an estimated 1–5 score.

Section IMCQ CalculatorNumber correct out of 60 to a percentage and its weighted share of your score.

Section IIFRQ CalculatorPoints on questions 1–7, or a total, to a percentage and its weighted share.

Chemistry Calculators by Unit

Each calculator is paired with a guide that teaches the same method by hand.

Every unitSig Fig CalculatorCount significant figures, round, and do arithmetic with the right precision.

Every unitScientific Notation CalculatorConvert to and from scientific and engineering notation, and calculate with it.

Unit 1Molar Mass CalculatorMolar mass with percent composition, plus grams, moles, and particles.

Unit 1Empirical Formula CalculatorEmpirical and molecular formulas from percent, grams, or combustion data.

Unit 3Gas Law CalculatorIdeal gas law and the combined, Boyle’s, Charles’s, and Gay-Lussac’s laws.

Unit 4Percent Yield CalculatorLimiting reactant, theoretical yield, and percent yield from a balanced equation.

Unit 5Half-Life CalculatorFirst-order decay and the zero-, first-, and second-order integrated rate laws.

The guides behind them are significant figures, molar mass, empirical and molecular formulas, gas laws, limiting reactant and percent yield, and integrated rate laws. All nine units are mapped in AP Chemistry units.

Which Calculator You Can Use on the AP Chemistry Exam

Both sections allow a calculator. Under College Board’s AP calculator policy, a calculator is allowed on AP Chemistry multiple choice and free response.
Bluebook has one built in. The testing app includes a Desmos calculator, so you can also use that.
Bring a scientific or graphing calculator from the approved list if you prefer your own; check the policy page for models that are not allowed.
The equations sheet and periodic table are provided, so the constants these calculators use are the same ones you will have.

How the two sections are timed and weighted is laid out in AP Chemistry exam format, and every equation on the sheet is explained in the AP Chemistry reference sheet guide.

How These Calculators Handle Significant Figures and Constants

Atomic masses come from the periodic table in the current AP Chemistry Course and Exam Description, such as 32.06 for sulfur.
Constants match the equations sheet: 6.022 × 10²³ mol⁻¹, R = 0.08206 L·atm/(mol·K), and t_1/2 = 0.693/k.
Answers are rounded to the significant figures your inputs support, and each step shows the numbers you typed, not padded decimals.

Frequently Asked Questions

Can you use a calculator on the AP Chemistry exam?

Yes, on both sections. College Board’s AP calculator policy lists a calculator as allowed for AP Chemistry multiple choice and free response, and the Bluebook testing app includes a built-in Desmos calculator. A scientific or graphing calculator is recommended.

Which calculator should I use for AP Chemistry?

Any scientific or graphing calculator that is on College Board’s approved list works, as does the Desmos calculator built into Bluebook. Practice with the one you will use on exam day so that logs, exponents, and scientific notation entry are automatic.

Do these chemistry calculators use the AP periodic table?

Yes. Atomic masses match the periodic table in the current AP Chemistry Course and Exam Description, such as 32.06 for sulfur and 1.008 for hydrogen, and constants match the equations sheet: Avogadro’s number 6.022 × 10^23 and R = 0.08206 L·atm/(mol·K).

How do I estimate my AP Chemistry score?

Use the AP Chem Score Calculator on the homepage. Enter your multiple-choice and free-response points from a practice exam and it estimates your 1–5 score, with a breakdown of what each section contributes.

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