Song Length Calculator
Reviewed by Hamza Gujjar, Algorithm Architect & Software Developer
Last updated: August 21, 2026Find Track Duration from BPM & Bars
Find the exact length of a song, verse, chorus, or full track from its tempo (BPM), time signature, and number of bars. Enter your values below and get the duration instantly in minutes, seconds, and total seconds — along with the formula behind the result.
How Song Length Is Calculated
A song's duration depends on three things: how fast it's played (tempo), how many beats fall in each bar (time signature), and how many bars it contains. The formula is:
Song Length (seconds) = Bars × Beats per Bar × (60 ÷ BPM)
Broken into steps:
- Find the length of one beat — divide 60 by the BPM. At 120 BPM, one beat = 60 ÷ 120 = 0.5 seconds.
- Find the length of one bar — multiply beat length by the beats per bar (from the time signature). In 4/4 time: 0.5 × 4 = 2 seconds per bar.
- Multiply by total bars — a 64-bar song at this tempo = 64 × 2 = 128 seconds, or 2 minutes 8 seconds.
This calculator does all three steps for you and also works in reverse — enter a target duration to find out how many bars you need at a given tempo.
Worked Examples
Example 1 — Full pop song
120 BPM, 4/4 time, 90 bars
→ (60 ÷ 120) × 4 × 90 = 180 seconds = 3:00
Example 2 — 16-bar verse
100 BPM, 4/4 time, 16 bars
→ (60 ÷ 100) × 4 × 16 = 38.4 seconds
Example 3 — Waltz (3/4 time)
90 BPM, 3/4 time, 48 bars
→ (60 ÷ 90) × 3 × 48 = 96 seconds = 1:36
Example 4 — EDM build (6/8 time)
128 BPM, 6/8 time, 32 bars
→ (60 ÷ 128) × 6 × 32 = 90 seconds = 1:30
Quick Reference: 32 Bars in 4/4 Time by Tempo
| BPM | Genre example | Time for 32 bars |
|---|---|---|
| 80 | Hip-hop / R&B | 96.0 sec (1:36) |
| 90 | Boom-bap hip-hop | 85.3 sec (1:25) |
| 100 | Pop ballad | 76.8 sec (1:17) |
| 120 | Pop / house | 64.0 sec (1:04) |
| 124 | Progressive house | 61.9 sec (1:02) |
| 128 | House / techno | 60.0 sec (1:00) |
| 140 | Dubstep / trap | 54.9 sec (0:55) |
| 174 | Drum & bass | 44.1 sec (0:44) |
Table shows 4/4 time throughout. Use the calculator above for other time signatures or bar counts.
Why Time Signature Changes the Math
The beats-per-bar number from your time signature directly controls how long each bar lasts — this is the detail most people miss.
- 4/4 — 4 beats per bar (most pop, rock, hip-hop)
- 3/4 — 3 beats per bar, waltz feel (bars are shorter at the same BPM)
- 6/8 — 6 beats per bar, but each beat is an eighth note, so it plays faster than 6/4 at the same BPM
- 7/4 — 7 beats per bar (progressive rock, odd-meter tracks)
Two songs at the identical BPM can have very different bar lengths just because of time signature — always check this field before trusting a duration estimate.
Common Uses
- Songwriters & producers — plan verse, chorus, and bridge lengths before recording
- DJs — calculate phrase lengths (8, 16, 32, 64 bars) for beatmatching and mix points
- Film & video editors — time a music cue to fit a scene length exactly
- Radio & podcast producers — hit an exact runtime for a segment or edit
- Music students — check homework on tempo, meter, and duration relationships
Frequently Asked Questions
How do I calculate song length from BPM?
Divide 60 by the BPM to get the length of one beat in seconds, multiply by the beats per bar (4 for standard 4/4 time), then multiply by the total number of bars in the song.
What is the average song length today?
Most modern pop and streaming-era songs run between 2 minutes 30 seconds and 3 minutes 30 seconds, shorter than the 3–5 minute average common before streaming platforms rewarded quicker song completion rates.
How many bars is a typical 3-minute song?
At 120 BPM in 4/4 time, 3 minutes (180 seconds) works out to 90 bars. At a faster 140 BPM, the same 3 minutes is about 105 bars, since each bar takes less time.
Does time signature affect song length at the same BPM?
Yes. A 3/4 bar has fewer beats than a 4/4 bar, so it takes less time at the same tempo. A 6/8 bar uses eighth notes as the beat unit, so it plays faster than a 6/4 bar even though both have six beats per bar.
Can I use this to find how many bars fit in a set time limit?
Yes — enter your BPM, time signature, and target duration, and the calculator solves for the number of bars, which is useful for hitting a strict radio edit, sync licensing cue, or contest submission length.
Is this calculator accurate for songs with tempo changes?
The formula assumes a constant tempo throughout. If your song has ritardandos, accelerandos, or a tempo change mid-track, calculate each section separately at its own BPM and add the results together.
Related Calculations
Work out how a track's runtime shifts when the tempo changes with the Tempo Change Calculator, or get exact measure duration for unusual time signatures with the Time Signature Calculator.