KDA Calculator

What is a KDA calculator?

A KDA calculator turns three numbers from a match scoreboard — your kills, deaths and assists — into two standard performance ratios: your KDA and your K/D ratio. KDA (kill / death / assist) rewards teamwork by counting assists, while the classic K/D ratio measures pure fragging by ignoring them. Players of League of Legends, Valorant, Dota 2, Overwatch, Call of Duty and most other competitive shooters and MOBAs use these two numbers to judge a single game or compare performance over a session.

Type your kills, deaths and assists into the tool above and it returns both ratios instantly, to two decimal places. Nothing is uploaded — the math runs entirely in your browser.

How is KDA calculated?

The tool uses two related formulas, both applied to one match:

• KDA = (kills + assists) ÷ deaths
• K/D = kills ÷ deaths

Every input is a whole number of zero or more:

• Kills — the number of enemies you eliminated yourself.
• Deaths — the number of times you were eliminated. This is the denominator of both ratios.
• Assists — kills you helped secure without landing the final blow. Assists raise your KDA but have no effect on your K/D.

Because assists sit only in the KDA numerator, KDA is always greater than or equal to K/D for the same game. The difference between the two numbers is exactly assists ÷ deaths, which tells you how much of your score came from supporting teammates rather than securing kills yourself.

Both results are rounded and shown to two decimal places, so a clean value such as 9 displays as 9.00.

What happens at 0 deaths?

If deaths = 0, both ratios divide by zero and are mathematically undefined. Instead of showing an error, the tool reports a Perfect game and displays the effective value: kills + assists for KDA and kills for K/D — the numerator with no division applied. A flawless 12 kills, 0 deaths, 4 assists round therefore shows a Perfect game with effective values of 16 (KDA) and 12 (K/D), rather than a ratio.

Examples

Each example uses only the formulas above, so you can reproduce every answer by typing the same three numbers into the calculator.

Example 1 — a strong carry game (10 / 2 / 8)

Kills 10, deaths 2, assists 8.

KDA = (kills + assists) ÷ deaths = (10 + 8) ÷ 2 = 18 ÷ 2 = 9.00

K/D = kills ÷ deaths = 10 ÷ 2 = 5.00

The 8 assists lift the KDA to 9.00, a full 4.00 above the 5.00 K/D — the gap is 8 ÷ 2 = 4.00, the assist contribution.

Example 2 — a perfectly even game (5 / 5 / 5)

Kills 5, deaths 5, assists 5.

KDA = (5 + 5) ÷ 5 = 10 ÷ 5 = 2.00

K/D = 5 ÷ 5 = 1.00

Equal kills and deaths give a 1.00 K/D, and the matching assists push the KDA to 2.00. This is the textbook “average” scoreline.

Example 3 — a Perfect game, no deaths (12 / 0 / 4)

Kills 12, deaths 0, assists 4.

With deaths = 0 the division is undefined, so the tool reports a Perfect game. It shows the effective values: KDA = kills + assists = 12 + 4 = 16 and K/D = kills = 12. No ratio is calculated because you were never eliminated.

Example 4 — a rough game (4 / 8 / 10)

Kills 4, deaths 8, assists 10.

KDA = (4 + 10) ÷ 8 = 14 ÷ 8 = 1.75

K/D = 4 ÷ 8 = 0.50

Here you died more than you killed, so K/D drops below 1 to 0.50. The 10 assists still rescue the KDA up to 1.75, showing you contributed to the team even on an off night.

KDA and K/D reference table

The table below works the formulas for a range of scorelines so you can sanity-check the tool. Every row is (kills + assists) ÷ deaths and kills ÷ deaths, rounded to two decimals; the last row shows the 0-death Perfect case.

Kills	Deaths	Assists	KDA	K/D
10	2	8	9.00	5.00
5	5	5	2.00	1.00
8	4	12	5.00	2.00
9	6	12	3.50	1.50
4	8	10	1.75	0.50
0	3	0	0.00	0.00
12	0	4	Perfect (16)	Perfect (12)

Notice that KDA is never lower than K/D on the same row, and the two are equal only when assists are 0.

Common uses

KDA and K/D are among the most-checked numbers in competitive gaming:

• Post-match review — judging how a single game went the moment the scoreboard appears.
• Comparing roles — a support with many assists is better measured by KDA, while a duelist or sniper is often judged on K/D.
• Tracking a session — running each game through the tool to see whether your average ratio is climbing or sliding.
• Ranked and LFG context — quoting a recent KDA when forming a team or explaining a placement.
• Coaching and VOD notes — pairing the numbers with what actually happened in the game to find patterns.

Tips and common mistakes

• Pick the right metric for your role. KDA flatters playmakers and supports because it counts assists; K/D is the stricter, kill-only measure. Compare like with like.
• Do not read a single game as a trend. One Perfect game or one feeding game says little — average several matches before drawing conclusions.
• Count assists, not just kills. Forgetting assists understates your KDA. The tool needs all three numbers to be accurate.
• Higher is better, but context matters. A 9.00 KDA in a stomp is not the same as a 9.00 in a 45-minute nail-biter; the ratio ignores game length and difficulty.
• Remember K/D ignores assists entirely. If your K/D looks low but your KDA is healthy, you are likely playing a supportive style — that is the gap working as intended.
• A Perfect game is not infinite. With 0 deaths the ratio is undefined, so the tool shows kills + assists and kills as effective values rather than a sky-high number.

Limitations and notes

This calculator measures only kills, deaths and assists from one scoreline. It does not know game length, objective play, damage dealt, healing, gold, your role or how hard the lobby was — all of which matter as much as the raw ratio. KDA and K/D are also defined slightly differently across titles (some games count an assist more generously than others), but this tool applies the universal (kills + assists) ÷ deaths and kills ÷ deaths math, so it matches the standard MOBA and shooter scoreboard. At 0 deaths the ratios are genuinely undefined, which is why a Perfect game shows effective values instead of a number. Everything runs privately in your browser — your kills, deaths and assists are never uploaded or stored, so you can crunch a whole session of games freely.

To analyse more of your play, pair this with the win rate calculator to track your match record, the CS2 trade-up calculator for skin odds, or the percentage calculator for headshot and accuracy figures — and browse more in the gaming category.